WO2002012447A2 - Isolation and use of solid tumor stem cells - Google Patents
Isolation and use of solid tumor stem cells Download PDFInfo
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- WO2002012447A2 WO2002012447A2 PCT/US2001/024243 US0124243W WO0212447A2 WO 2002012447 A2 WO2002012447 A2 WO 2002012447A2 US 0124243 W US0124243 W US 0124243W WO 0212447 A2 WO0212447 A2 WO 0212447A2
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- solid tumor
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- tumor stem
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Definitions
- This invention relates to the diagnosis and treatment of cancer.
- breast cancer is the most common cancer in American women, with approximately one in nine women developing breast cancer in their lifetime.
- metastatic breast cancer is still an incurable disease.
- Most women with metastatic breast cancer succumb to the disease.
- the invention is based upon the discovery that a small percentage of cells within an established solid tumor have the properties of "stem cells". These solid tumor “stem” cells give rise both to more solid tumor stem cells and to the majority of cells in the tumor, cancer cells that have lost the capacity for extensive proliferation and the ability to give rise to new tumors. Thus, solid tumor cell heterogeneity reflects the presence of a variety of tumor cell types that arise from a solid tumor stem cell.
- Solid tumor stem cells are the truly tumorigenic cells that are capable of re-establishing a tumor following treatment.
- the invention provides in vivo and in vitro assays of solid tumor stem cell function and cell function by the various populations of cells isolated from a solid tumor.
- the invention provides methods for using the various populations of cells isolated from a solid tumor (such as a population of cells enriched for solid tumor stem cells) to identify factors influencing solid tumor stem cell proliferation, to analyze populations of cells isolated from solid tumors for gene expression patterns or protein expression patterns, to identify new anti-cancer drug targets, to predict the sensitivity of tumors from individual patients to existing anti-cancer treatment regimens, to model anti-cancer treatment, to test new therapeutic compounds, to identify and test new diagnostic markers, to treat tumors, to produce genetically modified solid rumor stem cells, and to prepare cD A libraries and microarrays of polynucleotides and polypeptides from solid tumor stem cells.
- the invention provides a method for consistently growing solid tumor cells in vivo.
- the invention also provides a method to grow solid tumor cells that are in single cell suspension or in small aggregates.
- the invention provides a chimeric animal (a xenograft model) in which tumors can be established from solid tumor primary cells and in which the tumors derived from these solid tumor cells can be tested.
- the invention provides tumor banks (large enough to perform substantial numbers of bioassays) derived from single solid tumor stem cells.
- the invention usefully provides methods for screening for anti-cancer agents; for the testing of anti-cancer therapies; for the development of drugs targeting novel pathways; for the identification of new anti-cancer therapeutic targets; the identification and diagnosis of malignant cells in pathology specimens; for the testing and assaying of solid tumor stem cell drug sensitivity; for the measurement of specific factors that predict drug sensitivity; and for the screening of patients (e.g., as an adjunct for mammography).
- the invention can be used as a model to test patients' tumor sensitivity to known therapies; as a model for identification of new therapeutic targets for cancer treatment; as a system to establish a tumor bank for testing new therapeutic agents for treatment of cancer; and as a system to identify the tumorigenic cancer cells.
- the invention provides synergy between the methods of the invention and breast cancer genomic databases, for an improved anti-cancer drug discovery.
- FIG. 1 shows two models of solid tumor heterogeneity.
- mutations or environmental differences cause tumor cells to adopt a variety of different phenotypes.
- Environmentally detennined differences in phenotype, represented by white, green, and red cells may be reversible while mutationally determined changes in phenotype, represented by purple cells, may not be reversible.
- Many cells with a variety of different phenotypes are thought to have the potential to proliferate extensively and form new tumors.
- the tumor stem cell model (FIG. IB) is distinguished by having only a minor population of tumor cells that are tumorigenic (yellow cells).
- FIG. 2 is a set of FACS plots of breast cancer tumor cells. Mice were implanted with primary breast cancer tumor cells removed from two human patients. Resultant tumors were removed from the mouse and single cell suspensions were made. Cells were stained with anti-CD44-PE, anti-520C9-APC, anti-mouse H2K-FITC (which stains infiltrating mouse cells) and Propidium Iodide (PI, which stains dead cells). Live, human CD44 + and human CD44 " cells were isolated and used for in vitro and in vivo studies.
- FIG. 3 is a set of FACS plots showing the expression of CD24 by malignant breast cells. Cells were isolated and stained as described in FIG. 2. Mouse cells and dead cells were gated out of the analysis. The FACS plots of cells from three breast cancer tumors are shown. Note that cells from all three tumors have a similar phenotype.
- FIG. 4 is a set of FACS plots showing an analysis of tumors arising from the CD24 " cell population from human breast cancers.
- the CD24 " cells give rise to tumors that contain both CD24 + and CD24 ' cells.
- secondary transplants were performed using B38.1 + CD24 " cells (FIG. 4A).
- the resultant tumors were removed and the cells were re-analyzed with respect to B38.1 and CD24 expression.
- cells obtained from a tumor arising from transplanted B38.1 + CD24 " cells were heterogeneous with respect to expression of both B38.1 and CD24 (FIG. 4B).
- FIG. 5 is a FACS plot showing an analysis of Notch 4 expression.
- Cells were isolated from a mouse xenograft tumor (see, below) and stained with antibodies. Malignant cells were analyzed for expression of B38.1 and Notch 4. Mouse cells and dead cells were gated out of the analysis.
- FIG. 6 shows the fractionation of breast cancer cells based upon CD44 expression.
- Tumor Tl cells FIG. 6A, FIG. 6C, and FIG. 6E
- Tumor T2 cells FIG. 6B, FIG. 6D, and FIG. 6F
- Flow cytometry was used to isolate live, human (H2K-) cells that were either CD44 + (FIG. 6C, FIG. 6D) or CD44 " (FIG. 6E, FIG. 6F).
- Dead cells (7AAD + ) were eliminated from all analyses.
- FIG. 6B are dot plots of the unfractionated Tl and T2 cells showing CD44 and H2K expression as indicated.
- Plots showing the isolated CD44 + (FIG. 6C, FIG. 6D) and CD44 " (FIG. 6E, FIG. 6F) populations depict reanalyses of cells that had been isolated by flow-cytometry. These cells were injected into the mammary fat pads of mice to examine their tumorigenicity. TABLES 1 and 3 show that the CD44 + cells but not the CD44 " cells were tumorigenic.
- FIG. 7 shows the isolation of tumorigenic cells. Flow cytometry was used to isolate subpopulations of Tumor Tl (FIG. 7A, FIG. 7D, and FIG. 7G), Tumor T2 (FIG.
- Tumor T5 cells (FIG. 7C, FIG. 7F, and FIG. 71) that were tested for tumorigenicity in NOD/SCID mice.
- Tl and T2 cells had been passaged once in NOD/SCID mice while T5 cells were obtained from material that had been frozen immediately after removal from a patient.
- Cells were stained with anti-B38.1-APC, anti-CD44-PE, anti-CD24-FITC, anti-LINEAGE-Cytochrome, anti-mouse-H2K-Cytochrome (Tl and T2 cells only), and 7 A AD.
- Dead cells (7AAD + ), mouse cells (H2K ) and LINEAGE "1" cells were eliminated from all analyses.
- FIG. 7A, FIG. 7B, and FIG. 7C show unfractionated tumor cells.
- B38.1 + CD44 ⁇ LINEAGE- cells that were either CD24 " l0 (FIG. 7G, FIG. 7H, FIG. 71) or CD24 + (FIG. 7D, FIG. 7E, FIG. 7F) were isolated from these tumor cells by flow-cytometry.
- FIGS. 7D-7I depict reanalyses of these sorted populations, which were subsequently injected into the mammary fat pads of NOD/SCID mice to test tumorigenicity.
- FIG. 7A, FIG. 7B, and FIG. 7C show unfractionated tumor cells.
- B38.1 + CD44 ⁇ LINEAGE- cells that were either CD24 " l0 (FIG. 7G, FIG. 7H, FIG. 71) or CD24 + (FIG. 7D, FIG. 7E, FIG. 7F) were isolated from these tumor cells by flow-cytometry.
- FIGS. 7D-7I depict reanalyses of these
- FIG. 7J shows a representative tumor in a mouse at the B38.1 + CD44 + CD24 " ⁇ o LINEAGE- injection site, but not at the B38.1 + CD44 + CD24 + LINEAGE- injection site. Histology performed on tissue from the CD24 + (FIG. 7K, 20x objective magnification) and CD24 '710 (FIG. 7L, 40x objective magnification) injection sites exhibited normal mouse tissue and malignant cells respectively. [17] FIG. 8 shows the enrichment of tumorigenic cells based upon ESA expression. Flow cytometry was used to isolate subpopulations of Tumor Tl cells that were tested for tumorigenicity in NOD/SCID mice. Tl cells had been passaged once in NOD/SCID mice.
- FIG. 8A depicts the CD24 and ESA staining pattern of live human B38.1 + LINEAGE" cells. The tumorigenic population is boxed and marked with an arrow.
- FIG. 8B the ESA + B38.1 + CD24 _ lo LINEAGE- cells (left panel) and the remaining LINEAGE " H2K " cells (right panel) were collected using flow cytometry.
- FIG. 9 is the results of an in vitro clonogenic assay. Flow cytometry was used to isolate tumorigenic cell or the rest of the non-tumorigenic neoplastic (non-tumorigenic cells) as described. The cells were placed in tissue culture medium containing soluble Delta for the indicated number of days. The tumorigenic and non-tumorigenic xenograft Tumor 1 (Tl) (FIG. 9A), Tumor 4 (T4) (FIG. 9B) or primary patient (FIG. 9C) cells are shown at the indicated time after being placed in tissue culture. T4 cells were stained with Papanicolaou stain and examined under light microscopy (lOOx objective). Note that both the non-tumorigenic (FIG.
- FIG. 10 is a set of dot plots showing the phenotypic diversity in tumors arising from B38.1 + CD44 + CD24- l0 LINEAGE- cells. The dot plots depict the CD24 and CD44 staining patterns of live human LINEAGE " cells from Tumor Tl (FIG. 10A - FIG. IOC) or Tumor T2 (FIG. 10D - FIG. 10F).
- FIG. 10A and FIG. 10D show unfractionated Tl or T2 cells obtained from tumors that had been passaged once in NOD/SCID mice.
- B38.1 + CD44+CD24 "/Io LINEAGE- cells from Tl (FIG. 10B) or T2 (FIG. 10E) were isolated as described in FIG. 2, above.
- the B38. l+CD44 + CD24- /lo LINEAGE- populations reanalyzed in FIG. 10B and FIG. 10E) were injected into the mammary fat pads of NOD/SCID mice.
- FIG. IOC and FIG. 10F depict analyses of the tumors that arose from these B38.1+CD44+CD24 "/l0 LINEAGE- cells. Note that in both cases, the
- B38.1 + CD44+CD24 " l0 LINEAGE ' cells formed tumors that contained a phenotypically diverse population of cells similar to that observed in the original tumor.
- FIG. 11 shows the expression of HER2/neu and EGF-R.
- Flow cytometry was used to isolate subpopulations of Tumor Tl cells that had been passaged once in NOD/SCID mice.
- Cells were stained with, in FIG. 11 A, anti-EGF-R-PE, anti-B38.1-APC, anti-CD24-FITC, anti-LINEAGE-Cytochrome, anti-mouse-H2K-Cytochrome, and 7AAD or, in FIG. 1 IB anti-HER2/neu-FITC, anti-B38.1-APC, anti-CD24-PE, anti-LINEAGE-Cytochrome, anti-mouse-H2K-Cytochrome, and 7AAD.
- Dead cells (7AAD + ), mouse cells (H2K + ) and LINEAGE "1" cells were eliminated from all analyses.
- the histogram in FIG. 11 A depicts the EGF-R expression of the unstained cells (dotted line), B38.1 + CD24 " LINEAGE " tumorigenic population (shaded) and the B38 + CD24 + LINEAGE " non-tumorigenic (solid line) population.
- the histogram in FIG. 1 IB shows HER2/neu expression of the unstained cells (dotted line), B38.1 + CD24 " LINEAGE " tumorigenic population (shaded) and the B38 + CD24 + LINEAGE- non-tumorigenic (solid line) population.
- RT-PCR was performed using nested primers to detect EGF-R (FIG.
- FIG. 11C and FIG. 1 ID or to detect HER2/neu (FIG. 1 IE).
- FIG. 1 ID and FIG. 1 IE One cell per sample in panels FIG. 1 ID and FIG. 1 IE, or ten cells per sample in panel FIG. 11C, were analyzed.
- EGF-R is expressed at lower levels in tumorigenic cells than in non-tumorigenic cells at both the protein (FIG. 11 A) and mRNA levels (FIG. 11C, FIG. 1 ID).
- FIG. 13 is a schematic diagram of B38.1 + cells within a tumor. The breast cancer stem cells from multiple patients are B38.1 + . To successfully treat a cancer with a gene therapy approach, these cells can be targeted with a vector.
- FIG. 14 is a description of the method for obtaining the bi-specif ⁇ c conjugate and the chemical modifications introduced in the antibodies.
- FIG. 15 is a strategy for re-targeting Adenovirus.
- the LaZ virus can infect most of the cells from a tumor. After the LaZ virus is incubated only with the anti-fiber antibody, the LaZ virus loses ability to infect all of the cells. After the LaZ virus is incubated with the bi-specif ⁇ c conjugate, the B38.1 moiety of the molecule allows the attachment of the virus to the B38.1 + cells, so only these cells are infected.
- FIG. 16 shows the targeting of breast cancer stem cells with the bi-specif ⁇ c antibody.
- AdLaZ is an El -deleted Adenovirus that expresses the ⁇ -galactosidase gene
- the virus was incubated with the anti-fiber antibody for 30 min before infection (yellow columns).
- the virus was incubated with the bi-specific conjugate (green columns).
- the monolayers were fixed and incubated with X-Gal-contained buffer.
- the infected cells are blue, and the graphic shows the percentage of blue cells obtained, relative to the control infection (t ' .e., the reduction or increase in infectivity of the virus after incubation with the different antibodies).
- FIG. 17 shows that the bispecific antibody can target an adenovirus vector to breast cancer stem cells.
- the columns represent the absolute number of infected cells per field.
- Gray The indicated cells infected with the control adenovirus.
- Yellow the indicated cells were infected with the adenovirus that had been incubated with the anti-fiber antibody.
- Green The indicated cells were incubated with the bi-specific conjugate antibody.
- Red Cells were infected with the virus that had been incubated with the bi-specific conjugate antibody, but the cells were pre-treated with an excess of B38.1 antibody.
- FIG. 18 is a photograph of some of the cell monolayers after X-Gal staining.
- the infected cells appear like dark dots in this black and white picture (the ⁇ -galactosidase gene of the LaZ virus has a nuclear localization signal. The staining is in the nuclei of the cells.
- FIG. 19 is an analysis if different populations of cells in a breast cancer. ESA + CD44 + CD24- l0 LINEAGE- cells breast cancer stem cells (FIG. 19A) and ESA + CD44 + CD24 + LINEAGE- non-tumorigenic cells (FIG. 19B) were obtained as described in FIG. 8.
- the cells were stained with Hoechst 33342 as described by Eaves and colleagues (Glimm H et al, Blood. 96(13): 4185-93 (2000)). The histogram for the breast cancer stem cells is shaded. Note that the breast cancer stem cells and the non-tumorigenic cells are distributed in all phases of the cells cycle.
- FIG. 20 is a further analysis if different populations of cells in a breast cancer.
- CD44 + CD24 "/lo LINEAGE" cells breast cancer stem cells and non-tumorigenic CD44 + CD24 + LINEAGE " non-tumorigenic cells were obtained as described in FIG. 7.
- the cells were stained with Rhodamine 123 as described by Spangrude et al., Blood 85(4):1006-16, 1995).
- the histogram for the breast cancer stem cells is shaded. Note that the breast cancer stem cells tend to stain less intensely with Rhodamine 123.
- FIG. 21 is an analysis of ascites fluid for ovarian cancer stem cells. Cells were stained with anti-B38.1-APC, anti-CD44-PE, anti-CD24-FITC, anti-Lineage-Cytochrome and 7AAD. Dead cells (7AAD + ), and LINEAGE 4" cells were eliminated from the analyses. Note that there is a distinct CD44 + CD24 "/l0 LINEAGE " population of cells that resembles the breast cancer stem cells.
- FIG. 22 is an analysis of sarcoma cells for solid tumor stem cells.
- PI sarcoma cells growing in the xenograft model were stained with anti-B38.1-APC, anti-CD44-PE, anti-CD24- FITC, anti- LINEAGE-Cytochrome, anti-H2K-Cytochrome and 7AAD. Dead cells (7AAD + ), LINEAGE cells and mouse cells were eliminated from the analyses. Note that the lineage cocktail in this analysis did not include CD 10, CD31 or CD 140b. Also note that there is a distinct CD44 + CD24 " ⁇ o LINEAGE " population of cells.
- Solid tumors are composed of heterogeneous cell populations.
- breast cancers are a mixture of cancer cells and normal cells, including mesenchymal (stromal) cells, inflammatory cells, and endothelial cells.
- stromal mesenchymal
- Classic models hold that phenotypically distinct cancer cell populations all have the capacity to proliferate and give rise to a new tumor (FIG. 1 A).
- tumor cell heterogeneity results from environmental factors as well as ongoing mutation within cancer cells resulting in diverse populations of tumorigenic cells and all populations of cells would have similar tumorigenic potential.
- This invention is based upon an alternative model of solid tumor cell heterogeneity, in which a solid tumor results from a "solid tumor stem cell” (or “cancer stem cell” from a solid tumor) and the subsequent chaotic development of the solid tumor stem cell.
- solid tumors contain a distinct, limited (or possibly rare) subset of cells that share the properties of normal "stem cells", in that they proliferate extensively or indefinitely and that they efficiently give rise to additional solid tumor stem cells.
- solid tumor stem cells proliferate extensively and form new tumors, but solid tumor stem cells proliferate extensively and give rise to additional solid tumor stem cells as well as to other tumor cells that lack tumorigenic potential. It is this solid tumor stem cell population that proliferates and ultimately proves fatal.
- stem cells During normal animal development, cells of most or all tissues are derived from normal precursors, called stem cells (Morrison et al, Cell 88(3): 287-98 (1997); Morrison etal, Curr. Opin. Immunol. 9(2): 216-21 (1997); Morrison et al, Annu. Rev. Cell. Dev. Biol. 11: 35-71 (1995)).
- stem cell is known in the art to mean (1) that the cell is a cell capable of generating one or more kinds of progeny with reduced proliferative or developmental potential; (2) that the cell has extensive proliferative capacity; and (3) that the cell is capable of self-renewal or self-maintenance (see, Potten et al., Development 110: 1001 (1990); U.S. Pat. Nos. 5,750,376, 5,851,832, 5,753,506, 5,589,376, 5,824,489, 5,654,183, 5,693,482, 5,672,499, and 5,849,553, all incorporated by reference).
- hematopoietic stem and progenitor cells The best-known example of adult cell renewal by the differentiation of stem cells is the hematopoietic system (see, U.S. Pat. Nos. 5,061,620, 5,087,570, 5,643,741, 5,821,108, 5,914,108, each incorporated by reference). Developmentally immature precursors (hematopoietic stem and progenitor cells) respond to molecular signals to gradually form the varied blood and lymphoid cell types. Stem cells are also found in other tissues, including epithelial tissues (see, Slack, Science 287: 1431 (2000)) and mesenchymal tissues, (see, U.S. Pat. No. 5,942,225; incorporated by reference).
- solid tumors from which solid tumor stem cells can be isolated or enriched for according to the invention include sarcomas and carcinomas such as, but not limited to: fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon carcinoma, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, s
- Solid tumor stem cells are defined structurally and functionally as described herein; using the methods and assays similar to those described below. Because tumor cells are known to evolve phenotypically and functionally over time as additional genetic mutations occur, the solid tumor stem cells may change phenotypically and functionally over time in an individual patient. Nevertheless, one can use the method of the invention, employing the markers disclosed herein, which are consistently useful in the isolation or identification of solid tumor stem cells in a majority of patients.
- solid tumor stem cells undergo “self-renewal” and “differentiation” in a chaotic development to form a tumor, give rise to abnormal cell types, and may change over time as additional mutations occur.
- the functional features of a solid tumor stem cell are that they are tumorigenic, they give rise to additional tumorigenic cells ("self-renew”), and they can give rise to non-tumorigenic tumor cells ("differentiation").
- Solid tumor stem cells can vary between different types of solid tumor cancers. Solid tumor stem cells may arise either as a result of genetic damage that deregulates the proliferation and differentiation of normal stem cells (Lapidot et al., Nature 367(6464): 645-8 (1994)) or by the dysregulated proliferation of a normal restricted progenitor or a normal differentiated cell type. Typically, solid tumors are visualized and initially identified according to their locations, not by their developmental origin.
- a non-tumorigenic cell from a solid tumor is a cell from a population that fails to form a palpable tumor upon transplantation into an immunocompromised mouse, wherein if the same number of unfractionated, dissociated tumor cells were transplanted under the same circumstances, the solid tumor stem cells would form a palpable tumor in the same period of time. Thus non-tumorigenic cells are depleted for tumor forming activity in an animal model.
- a "palpable tumor” is known to those in the medical arts as a tumor that is capable of being handled, touched, or felt.
- the invention provides several novel uses:
- the solid tumor stem cells of the model of the invention differs from the "cancer stem line" provided by U.S. Pat. 6,004,528.
- the "cancer stem line” is defined as a slow growing progenitor cell type that itself has few mutations but which undergoes symmetric rather than asymmetric cell divisions as a result of tumorigenic changes that occur in the cell's environment.
- This "cancer stem line” hypothesis thus proposes that highly mutated, rapidly proliferating tumor cells arise largely as a result of an abnormal environment, which causes relatively normal stem cells to accumulate and then undergo mutations that cause them to become tumor cells.
- U.S. Pat. 6,004,528 proposes that such a model can be used to enhance the diagnosis of cancer.
- solid tumor stem cell model is fundamentally different than the "cancer stem line” model and as a result exhibits utilities not offered by the "cancer stem line” model.
- solid tumor stem cells are not “mutationally spared”.
- the "mutationally spared cancer stem line" described by U.S. Pat. No. 6,004,528 may be considered a pre-cancerous lesion, while the solid tumor stem cells described of this invention are cancer cells that themselves contain the mutations that are responsible for tumorigenesis. That is, the solid tumor stem cells (“cancer stem cells”) of the invention would be included among the highly mutated cells that are distinguished from the "cancer stem line" in U.S. Pat. 6,004,528.
- solid tumor stem cell model predicts that isolated solid tumor stem cells can give rise to additional tumors upon transplantation (thus explaining metastasis) while the "cancer stem line” model would predict that transplanted "cancer stem line” cells would not be able to give rise to a new tumor, since it was their abnormal environment that was tumorigenic. Indeed, the ability to transplant dissociated, and phenotypically isolated human solid tumor stem cells to mice (into an environment that is very different from the normal tumor environment), where they still form new tumors, distinguishes the present invention from the "cancer stem line” model.
- solid tumor stem cells likely divide both symmetrically and asymmetrically, such that symmetric cell division is not an obligate property.
- solid tumor stem cells may divide rapidly or slowly, depending on many variables, such that a slow proliferation rate is not a defining characteristic.
- solid tumor stem cells can be operationally characterized by cell surface markers. These cell surface markers can be recognized by reagents that specifically bind to the cell surface markers. For example, proteins, carbohydrates, or lipids on the surfaces of solid tumor stem cells can be immunologically recognized by antibodies specific for the particular protein or carbohydrate (for construction and use of antibodies to markers, see, Harlow, Using Antibodies: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1999); see also, EXAMPLES).
- the set of markers present on the cell surfaces of solid tumor stem cells (the "cancer stem cells" of the invention) and absent from the cell surfaces of these cells is characteristic for solid tumor stem cells. Therefore, solid tumor stem cells can be selected by positive and negative selection of cell surface markers.
- a reagent that binds to a solid tumor stem cell is a "positive marker” (i.e., a marker present on the cell surfaces of solid tumor stem cells) that can be used for the positive selection of solid tumor stem cells.
- a reagent that binds to a solid tumor stem cell "negative marker” i.e., a marker not present on the cell surfaces of solid tumor stem cells but present on the surfaces of other cells obtained from solid tumors
- the discrimination between cells based upon the detected expression of cell surface markers is by comparing the detected expression of the cell surface marker as compared with the mean expression by a control population of cells.
- the expression of a marker on a solid tumor stem cell can be compared to the mean expression of the marker by the other cells derived from the same tumor as the solid tumor stem cell.
- Other methods of discriminating among cells by marker expression include methods of gating cells by flow cytometry based upon marker expression (see, Givan A, Flow Cytometry: First Principles, (Wiley-Liss, New York, 1992); Owens MA & Loken MR., Flow Cytometry: Principles for Clinical Laboratory Practice, (Wiley-Liss, New York, 1995)).
- Solid tumor stem cell positive markers may also be present on cells other than solid tumor stem cells.
- Solid tumor stem cell negative markers may also be absent from cells other than solid tumor stem cells. While it is rare to identify a single marker that identifies a stem cell, it has often been possible to identify combinations of positive and negative markers that uniquely identify stem cells and allow their substantial enrichment in other contexts. Morrison et al, Cell 96(5): 737-49 (1999); Morrison et al, Proc. Natl. Acad. Sci. USA 92(22): 10302-6 (1995); Morrison & Weissman, Immunity 1(8): 661-73 (1994).
- a "combination of reagents” is at least two reagents that bind to cell surface markers either present (positive marker) or not present (negative marker) on the surfaces of solid tumor stem cells, or to a combination of positive and negative markers (see, EXAMPLES 7 and 8, TABLE 6).
- the use of a combination of antibodies specific for solid tumor stem cell surface markers results in the method of the invention being useful for the isolation or enrichment of solid tumor stem cells from a variety of solid tumors, including sarcomas, ovarian cancers, and breast tumors.
- Guidance to the use of a combination of reagents can be found in PCT patent application WO 01/052143 (Morrison & Anderson), incorporated by reference.
- solid tumor stem cells can be isolated from any animal solid tumor, particularly any mammalian solid tumor. It will be appreciated that, taking into consideration factors such as a binding affinities, that antibodies that recognize species-specific varieties of markers are used to enrich for and select solid tumor stem cells. Antibodies that recognize the species-specific varieties of CD44, B38.1, CD24 and other markers will be used to enrich for or isolate solid tumor stem cells from that species (for example, antibody to a mouse CD44 for mouse solid tumor stem cells, antibody to a monkey B38.1 for monkey solid tumor stem cells, etc.).
- An efficient xenograft model of human breast cancer provides a xenograft model in which to establish tumors by the injection of solid tumor cells into a host animal.
- the host animal can be a model organism such as nematode, fruit fly, zebrafish; preferably a laboratory mammal such as a mouse (nude mouse, SCID mouse, NOD/SCID mouse, Beige/SCID Mouse), rat, rabbit, or primate.
- the severely immunodeficient NOD-SCID mice were chosen as recipients to maximize the participation of injected cells. Immunodeficient mice do not reject human tissues, and SCID and NOD-SCID mice have been used as hosts for in vivo studies of human hematopoiesis and tissue engraftment.
- Xenograft tumors have been established from mastectomy specimens of all the patients that have been tested to date (see, EXAMPLE 7). Tumors in mice have also been established from malignant pleural effusions. In addition, tumors have been established by the subcutaneous injection of cells that have been obtained from two sarcomas. Furthermore, for all the tumors that we have attempted, we have been able to make single-cell suspensions (or suspensions with a few aggregates of cell, such as less than 100; preferably less than 10) and then transfer the tumors. This xenograft assay is useful for biological and molecular assays to characterize the tumorigenic, clonigenic solid tumor stem cells.
- the NOD/SCID or Beige/SCID mice can be further immunosuppressed, using VP-16 (see, EXAMPLES 1 and 3), radiation therapy, chemotherapy, or other immunosuppressive biological agents.
- breast cancer cells preferably enriched for breast cancer stem cells
- the cells are injected either into the mammary fat pads of mice or subcutaneously into the mice.
- tumors can be established from single-cell suspensions (or suspensions with a few aggregates of cell, such as less than 100; preferably less than 10) and then the tumors transferred to other mice.
- the limitations in the assays made it impossible to determine whether the colonies arose from stem cells that had lost their capacity to proliferate in vitro ,from non-tumorigenic cells that had limited proliferative potential, or whether the small number of cells able to form colonies in vitro was due to a "stem cell” population within the tumor or due to a rare cell that could proliferate in vitro. Furthermore, it was not possible to distinguish phenotypically different populations of cells: prior to this invention, very limited use was made of techniques like flow-cytometry to separate and analyze phenotypically distinct populations of solid tumor cells by flow-cytometry. Indeed, the clonogenic assays used in the prior art did not predict the behavior of an individual patient's tumor and fell out of favor.
- Notch Role of Notch in breast cancer.
- the Notch family of receptors has been implicated in stem cell development and differentiation (see, Morrison et al, Cell 101(5): 499-510 (2000); Artavanis-Tsakonas et al, Science 284: 770 (1999); and Artavanis-Tsakonas etal, Science 268: 225-232 (1995); U.S. Pat. No. 6,090,922, incorporated by reference).
- Notch was originally identified in Drosophila through loss-of-function mutations that produced too many neurons at the expense of other cell types. Poulson, Proc. Natl. Acad. Sci. USA 23: 133 (1937).
- Notch In all animal models tested, mutations in the Notch receptor result in developmental abnormalities. In C. elegans, Notch is required for germ line stem cell self-renewal. Berry et al, Development 124(4): 925-36 (1997). In rats, Notch regulates neural crest stem cell differentiation. Morrison et al, Cell 101(5): 499-510 (2000). Transient Notch activation initiates an irreversible switch from neurogenesis to gliogenesis by neural crest stem cells.
- Notch ligands may bind and activate Notch family receptors promiscuously. The expression of other genes, like Fringe family members (Panin et al, Nature 387(6636): 908-912 (1997)), may modify the interactions of Notch receptors with Notch ligands. Numb family members may also modify Notch signaling intracellularly.
- Ligand binding to Notch results in activation of a presenilin- 1 -dependent gamma-secretase-like protein that cleaves Notch.
- Notch 1 is thought to transactivate genes such as members of the Enhancer of Split (HES) family, while Notch 3 signaling may be inhibitory.
- HES Enhancer of Split
- Notch 4 is the human ortholog of the mouse int-3 oncogene that plays a role in breast cancer in mice.
- the invention is based upon the discovery that Notch 4 plays a role both in normal human breast development and in tumorigenesis. Within an individual tumor, only a small subpopulation of tumorigenic cells expresses high levels of Notch 4. An antibody that recognizes Notch 4 blocks the growth of breast cancer tumor cells in vitro and in vivo (see,
- the antibody binds to the extracellular domain of Notch 4. In a particular embodiment, the antibody binds to the polypeptide region
- any anti-Notch 4 antibody that inhibits Notch activation can be used to impair tumor survival.
- Inhibitors of Notch signaling can be used in the methods of the invention to inhibit solid tumor stem cells.
- the Notch pathway is modified to kill or inhibit the proliferation of solid tumor stem cells.
- the invention differs from the manipulation of non-terminally differentiated cells using the Notch pathway provided in U.S. Pat. No. 5,780,300.
- U.S. Pat. No. 5,780,300 addresses the modification of normal cells, not cancer cells. That patent is directed to methods for the expansion of non-terminally differentiated cells (normal precursor cells) using agonists of Notch function, by inhibiting the differentiation of the cells without inhibiting proliferation (mitotic activity) such that an expanded population of non-terminally differentiated cells is obtained.
- These expanded cells can be used in cell replacement therapy, a use that is incompatible with the goal of killing or inhibiting the proliferation of solid tumor stem cells by modifying Notch signaling in this invention.
- a corollary to the solid tumor stem cell model of the invention is that, to effectively treat cancer and achieve higher cure rates, anti-cancer therapies must be directed against solid tumor stem cells. Since current therapies are directed against the bulk population, they may be ineffective at eradicating solid tumor stem cells. The limitations of current cancer therapies derive from their inability to effectively kill solid tumor stem cells. The identification of solid tumor stem cells permits the specific targeting of therapeutic agents to this cell population, resulting in more effective cancer treatments. This concept would fundamentally change our approach to cancer treatment.
- genomics provide a powerful means for identifying drug targets in cancer cells, these targets are only valid if the targets are present within the tumorigenic cell population.
- genomics must be focused on individual populations within the heterogeneous cells that compose a tumor that are responsible for tumorigenic growth. In solid tumors, these are the solid tumor stem cells. Additionally, genomics has not yet been used to identify genes expressed in purified cell populations derived from cancerous tissues.
- flow cytometry such as FACS
- the xenograft animal model of the invention to enrich for specific cell populations.
- This technique has the advantage of being able to simultaneously isolate phenotypically pure populations of viable normal and tumor cells for molecular analysis.
- flow cytometry allows us to test the functions of the cell populations and use them in biological assays in addition to studying their gene expression profiles.
- such cells can also be characterized in biological assays.
- mesenchymal (stromal) cells can be analyzed for production of growth factors, matrix proteins and proteases, endothelial cells can be analyzed for production of specific factors involved in solid tumor growth support (such as neo-vascularization), and different subsets of tumor cells from a solid tumor can be isolated and analyzed for tumorigenicity, drug resistance and metastatic potential.
- Enriched as in an enriched population of cells, can be defined based upon the increased number of cells having a particular marker in a fractionated set of cells as compared with the number of cells having the marker in the unfractionated set of cells.
- the term "enriched can be preferably defined by tumorigenic fimction as the minimum number of cells that form tumors at limit dilution frequency in test mice.
- tumorigenic fimction as the minimum number of cells that form tumors at limit dilution frequency in test mice.
- FACS methods using CD44 alone can enrich solid tumor stem cells at least 2-fold (see, EXAMPLE 1 and 3).
- FACS methods using B38.1 and CD24 can enrich for solid tumor stem cells 5-6 fold (see, EXAMPLE 3).
- Enrichment using additional markers can enrich 10-fold or more and can be used to isolate solid tumor stem cells.
- isolated refers to a cell that is removed from its natural environment (such as in a solid tumor) and that is isolated or separated, and is at least about 75% free, and most preferably about 90% free, from other cells with which it is naturally present, but which lack the marker based on which the cells were isolated.
- the in vivo proliferation of solid tumor stem cells can be accomplished by injection of solid tumor stem cells into animals, preferably mammals, more preferably in rodents such as mice (due to the predictable methods that have been developed in the art for injection into laboratory rodents), and most preferably into immunocompromised mice, such as SCID mice, Beige/SCID mice or NOD/SCID mice (see, EXAMPLES).
- NOD/SCID mice are injected with the varying number of cells and observed for tumor formation.
- the injection can be by any method known in the art, following the enrichment of the injected population of cells for solid tumor stem cells.
- Ketamine/Xylazine 300 mg Ketamine combined with 20 mg Xylazine in a 4 ml volume. Then, 0.02 ml of the solution was diluted in HBSS is used per 20 g mouse. Mice were then treated with VP-16 (etoposide) via an intraperitoneal injection (30 mg etoposide per 1 kg, diluted in serum-free HBSS for a final injection volume of 0.2 ml).
- estrogen pellets were placed subcutanously on the back of the necks of the mice using a trocar. The mice were then warmed and placed back in to the cages after they awoke. All tumor injections/implantations were done 3-5 days after this procedure.
- a solid tumor is removed from the mice and made into a single cell suspension.
- Cells are stained and analyzed by flow cytometry (FACS) using methods known to those skilled in the art (Morrison & Weissman, Immunity 1(8): 661-73 (1994)).
- the phenotype of tumorigenic cells is CD44 + CD24 "/l0 in all tumors, and B38.1 + CD44 + CD24 "/l0 in most tumors.
- FACS flow cytometry
- Cells are stained with 7AAD (which stains dead cells), anti H2K-PE (which stains mouse cells), and combinations of antibodies against various markers that have heterogeneous expression patterns by the cancer cells including anti-B38.1, -annexin V, -Notch 4, -CD9, -CD24, -MUC1, -CD49F, -CD62P, -P-glycoprotein, -Notch 1, -520C9, -260F9 and -317G5.
- FACS is used to isolate viable human cells that either do or do not express one of the differentially expressed antigens.
- a combination of markers allows the greatest enrichment of tumorigenic cells. For the limiting dilution assays, one hundred, one thousand, ten thousand and one hundred thousand cells of each population are analyzed in vivo.
- SCID mice, NOD/SCID mice or Beige/SCID mice are injected with the varying number of cells and observed for tumors. Any tumors that form are removed for pathologic examination and FACS analysis. The tests are repeated (for example, about ten times) to confirm the results. The phenotypes of the tumorigenic cells are thus determined.
- Other general techniques for formulation and injection of cells may be found in Remington's Pharmaceutical Sciences, 20th ed. (Mack Publishing Co., Easton, PA).
- Suitable routes may include parenteral delivery, including intramuscular, subcutaneous (see, above), intrameduUary injections, as well as intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, or intraocular injections, just to name a few.
- the agents of the invention may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer.
- physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer.
- penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.
- the invention is an improvement over the methods of Mueller & Reisfeld, Cancer Metastasis Rev. 10: 193-200 (1991) (who used the SCID mouse, which allows disseminated growths for a number of human tumors, particularly hematologic disorders and malignant melanoma) and Sakakibara et al, Cancer J. Sci. Am. 2: 291-300 (1996) (who studied the growth and metastatic potential of surgical specimens of breast carcinomas engrafted into the large abdominal (gonadal) fat pad of severe combined immunodeficient (SCID) mice).
- the injection of solid tumor stem cells can consistently result in the successful establishment of tumors, more than 75% of the time, preferably more than 80% of the time, more preferably more than 85%, more than 90%, or more than 95% of the time.
- the invention provides for the advantageous establishment of solid tumors (particularly tumors from breast tumor stem cells) in mammary fat pads, an area not accessable for establishment using the methods of Sakakibara et al, Cancer J. 2: 291-300 (1996).
- Cells can be obtained from solid tumor tissue by dissociation of individual cells. Tissue from a particular tumor is removed using a sterile procedure, and the cells are dissociated using any method known in the art (see, Sambrook et al, Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1989); Current Protocols in Molecular Biology, Ausubel et al, eds., (Wiley Interscience, New York, 1993), and Molecular Biology LabFax, Brown, ed. (Academic Press, 1991)), including treatment with enzymes such as trypsin, collagenase and the like, or by using physical methods of dissociation such as with a blunt instrument.
- Dissociation Methods of dissociation are optimized by testing different concentrations of enzymes and for different periods of time, to maximize cell viability, retention of cell surface markers, and the ability to survive in culture (Worthington Enzyme Manual, Von Worthington, ed. (Worthington Biochemical Corporation, 2000). Dissociated cells are centrifuged at low speed, between 200 and 2000 rpm, usually about 1000 rpm (210 g), and then resuspended in culture medium. For guidance to methods for cell culture, see Spector et al, Cells: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1998).
- the dissociated tumor cells can be placed into any known culture medium capable of supporting cell growth, including HEM, DMEM, RPMI, F-12, and the like, containing supplements which are required for cellular metabolism such as glutamine and other amino acids, vitamins, minerals and useful proteins such as transferrin and the like.
- Medium may also contain antibiotics to prevent contamination with yeast, bacteria and fungi such as penicillin, streptomycin, gentamicin and the like.
- the medium may contain serum derived from bovine, equine, chicken and the like.
- a preferred embodiment for proliferation of solid tumor stem cells is to use a defined, low-serum culture medium.
- a preferred culture medium for solid tumor stem cells is a defined culture medium comprising a mixture of Ham's F12, 2% fetal calf serum, and a defined hormone and salt mixture, either insulin, transferrin, and selenium or B27 supplement. Brewer et al, J. Neuroscience Res. 35: 567 (1993). [88]
- the culture medium can be a chemically defined medium that is supplemented with fetal bovine serum or chick embryo extract (CEE) as a source of mitogens and survival factors to allow the growth of tumor stem cells in culture.
- CEE chick embryo extract
- serum-free culture medium containing one or more predetermined growth factors effective for inducing stem cell proliferation such as N2 supplement or B27 supplement
- predetermined growth factors effective for inducing stem cell proliferation such as N2 supplement or B27 supplement
- N2 supplement or B27 supplement known to those of skill in the art can be used to isolate and propagate solid tumor stem cells from other bird and mammalian species, such as human. See, U.S. Pat. Nos. 5,750,376, 5,851,832, and 5,753,506; Atlas et al, Handbook of Microbiological Media (CRC Press, Boca, Raton, Louisiana, 1993); Freshney, Cutler on Animal Cells, A Manual of Basic Technique, 3d Edition (Wiley-Liss, New York, 1994), all incorporated herein by reference.
- the culture medium for the proliferation of solid tumor stem cells thus supports the growth of solid tumor stem cells and the proliferated progeny.
- the "proliferated progeny” are undifferentiated tumor cells, including solid tumor stem cells, since solid tumor stem cells have a capability for extensive proliferation in culture.
- Conditions for culturing should be close to physiological conditions.
- the pH of the culture medium should be close to physiological pH, preferably between pH 6-8, more preferably between about pH 7 to 7.8, with pH 7.4 being most preferred.
- Physiological temperatures range between about 30°C to 40°C.
- Cells are preferably cultured at temperatures between about 32°C to about 38°C, and more preferably between about 35°C to about 37°C.
- cells may be cultured in levels of O 2 that are comparatively reduced relative to O 2 concentrations in air, such that the O 2 concentration is comparable to physiological levels (1-6%), rather than 20% O 2 in air.
- Solid tumor stem cell proliferated in vitro can also be genetically modified using techniques known in the art (see, below; see also, Sambrook et al, Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1989); Current Protocols in Molecular Biology, Ausubel et al, eds., (Wiley Inrerscience, New York, 1993)).
- the in vitro genetic modification may be more desirable in certain circumstances than in vivo genetic modification techniques when more control over the infection with the genetic material is required.
- Solid tumor stem cells and stem cell progeny can be cryopreserved until they are needed by any method known in the art.
- the cells can be suspended in an isotonic solution, preferably a cell culture medium, containing a particular cryopreservant.
- cryopreservants include dimethyl sulfoxide (DMSO), glycerol and the like. These cryopreservants are used at a concentration of 5-15%, preferably 8-10%.
- Cells are frozen gradually to a temperature of -10°C to -150°C, preferably -20°C to -100°C, and more preferably -150°C.
- genetic modification of solid tumor stem cells and solid tumor stem cell progeny In the undifferentiated state, the solid tumor stem cells rapidly divide and are therefore excellent targets for genetic modification.
- the term "genetic modification” as used herein refers to the stable or transient alteration of the genotype of a precursor cell by intentional introduction of exogenous DNA.
- DNA may be synthetic, or naturally derived, and may contain genes, portions of genes, or other useful DNA sequences.
- the term “genetic modification” as used herein is not meant to include naturally occurring alterations such as that which occurs through natural viral activity, natural genetic recombination, or the like. General methods for the genetic modification of eukaryotic cells are known in the art.
- Transformation may occur under natural or artificial conditions according to various methods well known in the art, and may rely on any known method for the insertion of foreign nucleic acid sequences into a prokaryotic or eukaryotic host cell.
- the method for transformation is selected based on the type of host cell being transformed and may include, but is not limited to, viral infection, electroporation, heat shock, lipofection, and particle bombardment.
- the term "transformed" cells includes stably transformed cells in which the inserted DNA is capable of replication either as an autonomously replicating plasmid or as part of the host chromosome, as well as transiently transformed cells which express the inserted DNA or RNA for limited periods of time.
- Viral transduction methods may comprise the use of a recombinant DNA or an RNA virus comprising a nucleic acid sequence that drives or inhibits expression of a protein to infect a target cell.
- a suitable DNA virus for use in the present invention includes but is not limited to an adenovirus (Ad), adeno-associated virus (AAV), herpes virus, vaccinia virus or a polio virus.
- a suitable RNA virus for use in the present invention includes but is not limited to a retrovirus or Sindbis virus. Several such DNA and RNA viruses exist that may be suitable for use in the present invention.
- Adenoviral vectors have proven especially useful for gene transfer into eukaryotic cells for vaccine development (Graham FL & Prevec L, In Vaccines: New Approaches to Immunological Problems, Ellis RV ed., 363-390 (Butterworth-Heinemann, Boston, 1992). [99] Specific guidance for the genetic modification of solid tumor stem cells is provides in EXAMPLE 13 and in FIGS. 15-18.
- Non- viral delivery techniques that have been used or proposed for gene therapy include DNA-ligand complexes, adenovirus-ligand-DNA complexes, direct injection of DNA, CaPO 4 precipitation, gene gun techniques, electroporation, and lipofection. Mulligan RC, Science 260: 926-932 (1993). Any of these methods are widely available to one skilled in the art and would be suitable for use in the present invention. Other suitable methods are available to one skilled in the art, and it is to be understood that the present invention may be accomplished using any of the available methods of transfection. Lipofection may be accomplished by encapsulating an isolated DNA molecule within a liposomal particle and contacting the liposomal particle with the cell membrane of the target cell.
- Liposomes are self-assembling, colloidal particles in which a lipid bilayer, composed of amphiphilic molecules such as phosphatidyl serine or phosphatidyl choline, encapsulates a portion of the surrounding media such that the lipid bilayer surrounds a hydrophilic interior.
- Unilammellar or multilammellar liposomes can be constructed such that the interior contains a desired chemical, drug, or, as in the instant invention, an isolated DNA molecule. Delivery by transfection, by liposome injections, or by polycationic amino polymers may be achieved using methods which are well known in the art (see, e.g., Goldman, C. K. et al. Nature Biotechnology 15:462-466 (1997)).
- Deletion mutants are wild-type cells that have been modified genetically so that a single gene, usually a protein-coding gene, is substantially deleted. Deletion mutants also include mutants in which a gene has been disrupted so that usually no detectable mRNA or bioactive protein is expressed from the gene, even though some portion of the genetic material may be present.
- mutants with a deletion or mutation that removes or inactivates one activity of a protein are used and are encompassed in the term "deletion mutants.”
- Over-expression mutants are wild-type cells that are modified genetically so that at least one gene, most often only one, in the modified solid tumor stem cell is expressed at a higher level as compared to a cell in which the gene is not modified.
- Tumor stem cells can be subjected to tissue culture protocols known in the art (see, U.S. Pat. Nos. 5,750,376 and 5,851,832, Spector et al, Cells: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1998)).
- Tumor stem cells can be genetically modified in culture to promote differentiation, cell death, or immunogenicity.
- tumor stem cells can be modified to enhance expression of products that direct an immune response against the patient's solid tumor.
- the solid tumor stem cells can be subjected to various proliferation protocols in vitro prior to genetic modification. The protocol used depends upon the type of genetically modified solid tumor stem cell or solid tumor stem cell progeny desired.
- Cells having the desired phenotype can be isolated and implanted into recipients in need of the protein or biologically active molecule that is expressed by the genetically modified cell. Such molecules can enhance tumor regression or inhibit tumor spread.
- Solid tumor stem cells and solid tumor stem cell progeny cultured in vitro can be used for the screening of potential therapeutic compositions.
- These compositions for the treatment of solid tumors can be applied to these cells in culture at varying dosages, and the response of these cells monitored for various time periods. Physical characteristics of these cells can be analyzed by observing cells by microscopy. The induction of expression of new or increased levels of proteins such as enzymes, receptors and other cell surface molecules can be analyzed with any technique known in the art see, Clarke et al, Proc. Natl.
- biochemical analysis includes protein assays, enzymatic assays, receptor binding assays, enzyme-linked immunosorbant assays (ELISA), electrophoretic analysis, analysis with high performance liquid chromatography (HPLC), Western blots, and radioimmune assays (RIA).
- Nucleic acid analysis such as Northern blots can be used to examine the levels of mRNA coding for these molecules or PCR (see, EXAMPLE 14).
- solid stem cells and solid stem cell progeny of the invention can be used in methods of determining the effect of a biological agents on solid tumor cells.
- biological agent or “test compound” refers to any agent (including a virus, protein, peptide, amino acid, lipid, carbohydrate, nucleic acid, nucleotide, drug, antibody, prodrug or other substance) that may have an effect on tumor cells whether such effect is harmful, beneficial, or otherwise.
- a culture of precursor cells derived from tumor stem cells can be obtained from tissue of a subject, such as a patient with a tumor or other cancerous disease, such as an epithelial cancer or breast cancer. Once the solid tumor stem cells or other desired populations of cells are obtained from the subject, the cells are cultured in vitro. The choice of culture depends upon the particular test compound being tested and the diagnostic effects that the laboratory personnel want to achieve. [107] The ability of various biological agents to increase, decrease, or modify in some other way the number and nature of the solid tumor stem cells and solid tumor stem cell progeny can be screened.
- test compounds that decrease the proliferative ability of the solid tumor stem cells, which would be useful for identifying anti-cancer therapeutic agents.
- the relevant cells are cultured in the presence of the test compounds of interest and assayed for the degree of proliferation or cell death that occurs.
- test compound The effects of a test compound or combination of test compounds on the extensive proliferation of solid tumor stem cells and their progeny can be determined. It is possible to screen non-tumorigenic solid tumor cells that have already been induced to lose the ability to extensively proliferate before the screening. It is also possible to determine the effects of the test compounds on the proliferation process by applying them to solid tumor stem cells.
- the test compound is solubilized and added to the culture medium or to the mouse in the in vivo assay at varying concentrations to determine the effect of the test compounds or agent at each dose.
- the culture medium may be replenished with the test compound or biological agent every couple of days in amounts so as to keep the concentration of the agent somewhat constant.
- the test compound can be re-administered to the mouse at different intervals to assess the effect of the compound over time.
- Changes in proliferation are observed by an increase or decrease in the number of cells that form or an increase or decrease in the size of the foci in vitro, or tumor size in vivo (which is a reflection of the rate of proliferation and the rate of cell death— determined by the numbers of cells per foci or tumor size in the mouse).
- the effect of the test compound on tumor stem cells are measured by determining the number of tumor stem cells that persist in culture or in the tumors in vivo after treatment with the test compound.
- the effects of the test compound on tumor stem cell-cycle status, and marker expression are also determined by flow-cytometry.
- test compounds or biological agents added to the culture medium or injected into the mouse can be at a final concentration in the range of about 10 pg/ml to 1 ⁇ g/ml, preferably about 1 ng/ml (or 1 ng/cc of blood) to 100 ng/ml (or 100 ng/cc of blood).
- test compounds or biological agents are identified on the basis of significant difference relative to control cultures with respect to criteria such as the ratios of expressed phenotypes, cell viability, proliferation rate, number of tumor stem cells, tumor stem cell activity upon transplantation in vivo, tumor stem cell activity upon transplantation in culture, cell cycle distribution of tumor cells, and alterations in gene expression.
- Therapeutic compositions and methods A pharmaceutical composition containing a Notch ligand, an anti-Notch antibody, or other therapeutic agent that acts as an agonist or antagonist of proteins in the Notch signal transduction/response pathway can be administered by any effective method.
- a physiologically appropriate solution containing an effective concentration of anti-Notch therapeutic agent can be administered topically, intraocularly, parenterally, orally, intranasally, intravenously, intramuscularly, subcutaneously or by any other effective means.
- the anti-Notch therapeutic agent may be directly injected into a target cancer or tumor tissue by a needle in amounts effective to treat the tumor cells of the target tissue.
- a cancer or tumor present in a body cavity such as in the eye, gastrointestinal tract, genitourinary tract (e.g., the urinary bladder), pulmonary and bronchial system and the like can receive a physiologically appropriate composition (e.g., a solution such as a saline or phosphate buffer, a suspension, or an emulsion, which is sterile) containing an effective concentration of anti-Notch therapeutic agent via direct injection with a needle or via a catheter or other delivery tube placed into the cancer or tumor afflicted hollow organ.
- a physiologically appropriate solution containing an effective concentration of anti-Notch therapeutic agent can be administered systemically into the blood circulation to treat a cancer or tumor that cannot be directly reached or anatomically isolated.
- the tumor cells may be present in or among the epithelial tissue in the lining of pulmonary bronchial tree, the lining of the gastrointestinal tract, the lining of the female reproductive tract, genitourinary tract, bladder, the gall bladder and any other organ tissue accessible to contact with the anti-Notch therapeutic agent.
- the solid tumor may be located in or on the lining of the central nervous system, such as, for example, the spinal cord, spinal roots or brain, so that anti-Notch therapeutic agent infused in the cerebrospinal fluid contacts and transduces the cells of the solid tumor in that space.
- the anti-Notch therapeutic agent can be modified to cross the blood brain barrier using method known in the art).
- the anti-Notch therapeutic agent can be administered to the solid tumor by direct injection of the vector suspension into the tumor so that anti-Notch therapeutic agent contacts and affects the tumor cells inside the tumor.
- the vector is administered in a composition comprising the vector together with a carrier or vehicle suitable for maintaining the transduction or transfection efficiency of the chosen vector and promoting a safe infusion.
- a carrier may be a pH balanced physiological buffer, such as a phosphate, citrate or bicarbonate buffers a saline solution, a slow release composition and any other substance useful for safely and effectively placing the anti-Notch therapeutic agent in contact with solid tumor stem cells to be treated.
- a therapeutically effective amount of an anti-Notch therapeutic agent is administered.
- a therapeutically effective dose refers to that amount of the compound sufficient to result in amelioration of symptoms or a prolongation of survival in a patient.
- Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determimng the LD 50 (the dose lethal to 50% of the population) and the ED 50 (the dose therapeutically effective in 50% of the population).
- the dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD 5 o/ED 50 .
- Compounds that exhibit large therapeutic indices are preferred.
- the data obtained from these cell culture assays and animal studies can be used in formulating a range of dosage for use in humans.
- the dosage of such compounds lies preferably within a range of circulating concentrations that include the ED 50 with little or no toxicity.
- the dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.
- the therapeutically effective dose can be estimated initially from cell culture assays.
- a dose may be fonnulated in animal models to achieve a circulating plasma concentration range that includes the IC 50 as determined in cell culture.
- Such information can be used to more accurately determine useful doses in humans.
- Levels in plasma may be measured, for example, by high performance liquid chromatography (HPLC).
- the exact formulation, route of administration and dosage can be chosen by the individual physician in view of the patient's condition (see e.g. Fingl et al, In The Pharmacological Basis of Therapeutics, Ch. 1, pg. 1 (1975)).
- the attending physician would know how to and when to terminate, interrupt, or adjust administration due to toxicity, or to organ dysfunctions. Conversely, the attending physician would also know to adjust treatment to higher levels if the clinical response were not adequate (precluding toxicity).
- the magnitude of an administrated dose in the management of the clinical disorder of interest can vary with the severity of the condition to be treated and the route of administration.
- agents may be formulated and administered systemically or locally. Techniques for formulation and administration may be found in Remington's Pharmaceutical Sciences, 20th ed. (Mack Publishing Co., Easton, PA).
- Suitable routes may include oral, rectal, transdermal, vaginal, transmucosal, or intestinal administration; parenteral delivery, including intramuscular, subcutaneous, intramedullary injections, as well as intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, or intraocular injections, just to name a few.
- the agents of the invention may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer.
- physiologically compatible buffers such as Hanks's solution, Ringer's solution, or physiological saline buffer.
- penetrants appropriate to the barrier to be permeated are used in the formulation. Such penetrants are generally known in the art.
- these pharmaceutical compositions may contain suitable pharmaceutically acceptable carriers comprising excipients and auxiliaries, which facilitate processing of the active compounds into preparations which can be used pharmaceutically.
- the preparations formulated for oral administration may be in the form of tablets, capsules, or solutions.
- the pharmaceutical compositions of the present invention may be manufactured in a manner that is itself known, e.g., by means of conventional mixing, dissolving, granulating, levigating, emulsifying, encapsulating, entrapping or lyophilizing processes.
- Pharmaceutical formulations for parenteral administration include aqueous solutions of the active compounds in water-soluble form. Additionally, suspensions of the active compounds may be prepared as appropriate oily injection suspensions.
- Suitable lipophilic solvents or vehicles include fatty oils such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate or triglycerides, or liposomes.
- Aqueous injection suspensions may contain substances that increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran.
- the suspension may also contain suitable stabilizers or agents that increase the solubility of the compounds to allow for the preparation of highly concentrated solutions.
- Polynucleotide refers to chain of nucleotides, which can be a nucleic acid, nucleic acid sequence, oligonucleotide, nucleotide, or any fragment thereof. It may be DNA or RNA of genomic DNA, mRNA, cDNA, or synthetic origin, double-stranded or single-stranded, and combined with carbohydrate, lipids, protein or other materials to perform a particular activity or form a useful composition. "Oligonucleotide” is substantially equivalent to the terms amplimer, primer, oligomer, element, and probe.
- probe refers to a polynucleotide sequence capable of hybridizing with a target sequence to form a polynucleotide probe/target complex.
- target polynucleotide refers to a chain of nucleotides to which a polynucleotide probe can hybridize by base pairing. In some instances, the sequences will be complementary (no mismatches) when aligned. In other instances, there may be up to a 10% mismatch.
- DNA or RNA can be isolated from the sample according to any of a number of methods well known to those of skill in the art. For example, methods of purification of nucleic acids are described in Tijssen, Laboratory Techniques in Biochemistry and Molecular Biology: Hybridization With Nucleic Acid Probes, Parti. Theory and Nucleic Acid Preparation (Elsevier, New YorkN.Y, 1993). "Sample” is used in its broadest sense.
- a sample containing polynucleotides or polypeptides can be a bodily fluid; an extract from a cell, chromosome, organelle, or membrane isolated from a cell; genomic DNA, RNA, or cDNA in solution or bound to a substrate; a cell; a tissue; a tissue print; and the like.
- Total RNA can be isolated using the TRIZOL reagent (Life Technologies, Gaithersburg MD, USA), and mRNA is isolated using oligo d(T) column chromatography or glass beads.
- target polynucleotides when target polynucleotides are derived from an mRNA, the target polynucleotides can be a cDNA reverse transcribed from an mRNA, an RNA transcribed from that cDNA, a DNA amplified from that cDNA, an RNA transcribed from the amplified DNA, and the like.
- the target polynucleotide is derived from DNA
- the target polynucleotide can be DNA amplified from DNA or RNA reverse transcribed from DNA.
- Ribozymes are RNAs which are capable of catalyzing
- Ribozyme methods involve exposing a cell to, inducing expression in a cell, etc. of such small RNA ribozyme molecules.
- antisense refers to any composition containing a nucleic acid sequence which is complementary to the "sense" strand of a specific nucleic acid sequence.
- Antisense molecules may be produced by any method including synthesis or transcription. Once introduced into a cell, the complementary nucleotides combine with natural sequences produced by the cell to form duplexes and to block either transcription or translation. The designation
- negative can refer to the antisense strand
- positive can refer to the sense strand
- Oligonucleotides may be synthesized by standard methods known in the art, e.g. by use of an automated DNA synthesizer (such as are commercially available from Biosearch, Applied
- Amplification relates to the production of additional copies of a nucleic acid sequence. Amplification is generally carried out using polymerase chain reaction (PCR) technologies well known in the art. See, e.g., Dieffenbach CW & Dveksler GS, PCR Primer, a
- Amplification can be polymerase chain reaction (PCR), ligase chain reaction (LCR), nucleic acid sequence-based amplification (NASBA), or T7 based RNA amplification.
- PCR polymerase chain reaction
- LCR ligase chain reaction
- NASBA nucleic acid sequence-based amplification
- T7 based RNA amplification T7 based RNA amplification.
- Polypeptide refers to an amino acid, amino acid sequence, oligopeptide, peptide, or protein or portions thereof whether naturally occurring or synthetic.
- Such methods also include enzymatic activity assays, which are available for most well-studied protein drug targets. Detection of proteins can be accomplished by antibodies (see,
- antigenic determinant refers to that fragment of a molecule
- an epitope that makes contact with a particular antibody.
- a protein or a fragment of a protein is used to immunize a host animal, numerous regions of the protein may induce the production of antibodies which bind specifically to antigenic determinants (given regions or three-dimensional structures on the protein).
- An antigenic determinant may compete with the intact antigen (i.e., the immunogen used to elicit the immune response) for binding to an antibody.
- Proteins isolated from an enriched population of solid tumor stem cells or isolated solid tumor cells can be separated by two-dimensional gel electrophoresis systems.
- Two-dimensional gel electrophoresis is well-known in the art and typically involves iso-electric focusing along a first dimension followed by SDS-PAGE electrophoresis along a second dimension. See, e.g., Hames et al, Gel Electrophoresis of Proteins: A Practical Approach (IRL Press, New York 1990); Lander, Science 274:536-539 (1996).
- the resulting electrophoretograms can be analyzed by numerous techniques, including mass spectrometric techniques, western blotting and immunoblot analysis using polyclonal and monoclonal antibodies, and internal and N-terminal micro-sequencing. Using these techniques, it is possible to identify a substantial fraction of all the proteins produced under given physiological conditions, including in cells (e.g., in solid tumor stem cells) exposed to a drug, or in cells modified by, e.g., deletion or over-expression of a specific gene.
- cDNA libraries The purified solid tumor stem cells, solid tumor stem cell progeny, non- tumorigenic cells, and unfractionated tumor cells can be used to make arrays or cDNA libraries using methods known in the art (see, Sambrook et al, Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1989); Current Protocols in Molecular Biology, Ausubel et al, eds., (Wiley Interscience, New York, 1993)) to identify potential novel drug targets.
- Molecular biology comprises a wide variety of techniques for the analysis of nucleic acids and proteins, many of which form the basis of clinical diagnostic assays. These techniques include nucleic acid hybridization analysis, restriction enzyme analysis, genetic sequence analysis, and separation and purification of nucleic acids and proteins (Sambrook et al, Molecular Cloning: A Laboratory Manual, Second Ed. (Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York, 1989). Many molecular biology techniques involve carrying out numerous operations on a large number of samples.
- Nucleic acid hybridization analysis generally involves the detection of a very small numbers of specific target nucleic acids (DNA or RNA) with probes among a large amount of non-target nucleic acids. Multiple sample nucleic acid hybridization analysis has been conducted on a variety of filter and solid support formats.
- the "dot blot” hybridization involves the non-covalent attachment of target DNAs to a filter, which are subsequently hybridized with a labeled probes.
- the "dot blot” hybridization has been further developed for multiple analysis (European Patent application EP 0 228 075) and for the detection of overlapping clones and the construction of genomic maps (U.S. Pat. 5,219,726).
- Microarrays Mimicking the in situ hybridization in some aspects, new techniques are being developed for carrying out multiple sample nucleic acid hybridization analysis on micro-formatted multiplex or matrix devices (e.g., DNA chips) (see, Barinaga, Science 253: 1489 (1991); Bains, Bio/Technology 10: 757-758 (1992)).
- Guidance for the use of microarrays is provided by Wang, E et al, Nature Biotechnology 18; 457-459 (2000); Diehn M et al, Nature Genetics 25: 58-62 (2000).
- Microarrays are known in the art and consist of a surface to which probes that correspond in sequence to gene products (e.g., cDNAs, oligonucleotides, mRNAs, cRNAs,. polypeptides, and fragments thereof), can be specifically hybridized or bound at a known position.
- the microarray is an array (i.e., a matrix) in which each position represents a discrete binding site for a product encoded by a gene (e.g., a protein or RNA), and in which binding sites are present for products of most or almost all of the genes in the organism's genome.
- the polynucleotides, polypeptides, or analogues are attached to a solid support or substrate, which may be made from glass, plastic (e.g., polypropylene, nylon), polyacrylamide, nitrocellulose, or other materials.
- substrate refers to any suitable rigid or semi-rigid support to which polynucleotides or polypeptides are bound and includes membranes, filters, chips, slides, wafers, fibers, magnetic or nonmagnetic beads, gels, capillaries or other tubing, plates, polymers, and microparticles with a variety of surface forms including wells, trenches, pins, channels and pores.
- the polynucleotides can be immobilized on a substrate by any method known in the art.
- the substrates are optically transparent.
- a variety of methods are currently available for making arrays of biological macromolecules, such as arrays of nucleic acid molecules or proteins.
- One method for making ordered arrays of DNA on a porous membrane is a "dot blot" or "slot-blot" method.
- a more efficient technique employed for making ordered arrays of fragments uses an array of pins dipped into the wells, e.g., the 96 wells of a microtiter plate, for transferring an array of samples to a substrate, such as a porous membrane.
- An alternate method of creating ordered arrays of nucleic acid sequences is described by U.S. Pat. No. 5,143,854 (to Pirrung). and also by Fodor et al, Science 251:767-773 (1991).
- the method involves synthesizing different nucleic acid sequences at different discrete regions of a support.
- Khrapko et al DNA Sequence 1:375-388 (1991) describes a method of making an oligonucleotide matrix by spotting DNA onto a thin layer of polyacrylamide, manually with a micropipette.
- U.S. Pat. No. 5,807,522 (to Brown et al, incorporated by reference) describes methods for fabricating microarrays of biological samples by dispensing a known volume of a reagent at each selected array position, by tapping a capillary dispenser on the support under conditions effective to draw a defined volume of liquid onto the support.
- Ink-jet technology provides another method of spotting microarrays. Adapted from the printer industry and redesigned for use in biotechnological applications, this uses piezoelectric crystal oscillators and an electrode guidance system to deposit the compound in a precise location on the slide or membrane. Companies such as Cartesian Technologies and ProtoGene Laboratories use this technology.
- a method for attaching the nucleic acids to a surface is by printing on glass plates, as is described generally by PCT publication WO 95/35505; DeRisi et al, Nature Genetics 14:457- 460 (1996); Shalon et al, Genome Res. 6:639-645 (1996); and Schena et al., Proc. Natl. Acad. Sci. USA 93: 10614-10619 (1995).
- Another method for making microarrays is by making high- density oligonucleotide arrays.
- U.S. Pat. No. 6,110,426 (to Shalon et al) a method and apparatus for fabricating microarrays of biological samples for large scale screening assays, such as arrays of DNA samples to be used in DNA hybridization assays for genetic research and diagnostic applications.
- U.S. Pat. No. 6,221,674 (to Sluka et al.) discloses a process is described for applying spatially defined reagent areas to a solid phase which is characterized in that a liquid containing an adsorptive binding reagent is contacted with spatially defined areas of a solid phase which comprises an essentially continuous metal or metal oxide surface for an adequate time period to enable the formation of adsorptive bonds between the binding reagent and the solid phase.
- a process is described in PCT application WO 92/10092 which can be used to generate a plurality of different structures on a glass support by means of photoreactive compounds and irradiation using masks.
- a process is described in U.S. Pat. No. 4,877,745 in which differently functionalized spots can be applied to plastic supports by means of ink-jet.
- vendors of microarrays and microarray technology useage are Affymetrix, Inc. (USA), NimbleGen Systems, Inc.
- metal and metal oxide surfaces have the advantage that they can be coated with an exactly defined matrix layer by self-assembly techniques.
- a self- assembled monolayer (SAM) is formed for example when organic alkylthiols are adsorbed onto a gold surface, the spontaneous organisation of such a densely packed monolayer being based on strong specific interactions between the support material and the adsorbent. Nuzzo et al, J. Am. Chem. Soc. 105: 4481 (1983). In this manner it is possible to apply an exactly defined monolayer of a binding matrix to the surface of metals such as e.g. gold or silver. Furthermore the specific binding capability of self-assembled solid phases can be further optimized by dilution of the specific solid phase reactants as described in EP-A-0 515 615.
- the coating of metal surfaces with microstructures based on self-assembled monolayers is also known and can be used to attach components isolated from solid tumor stem cells.
- Whitesides et al, Langmuir 10 (1994) 1498-1511 describe a process in which reagents are stamped onto a noble metal surface by means of a special microstructured silicone stamp. This enables microstructured monolayers to be generated with zones that are spatially separated from one another.
- Microstructures of self-assembled monolayers on noble metal surfaces can be formed by irradiation through masks of substrates whose whole area is covered with thiols and subsequent washing. Hemminger et al, Langmuir 10: 626-628 (1994).
- reagent spots are also formed in this process which are all identically functionalized.
- a further possibility of producing reagent spots is firstly to apply gold spots to a support that are already spatially separated from one another which are then subsequently coated with reagents.
- the binding of analytes to a functionalized solid phase matrix according to the invention can for example be detected by confocal scanner fluorescence microscopy or by plasmon resonance spectroscopy. Ruthenhausler B et al, Nature, 332: 615-617 (1988).
- U.S. Pat. No. 6,228,659 describes an apparatus for producing a plurality of arrays of reagent regions is disclosed.
- a dispensing assembly in the apparatus has a plurality of heads which are spaced for depositing reagents at selected positions in different array areas in a substrate.
- Transcript arrays can be employed for analyzing the transcriptional state in a cell, and especially for measuring the transcriptional states of cells exposed to graded levels of a therapy of interest such as graded levels of a drug of interest or to graded levels of a disease state of interest.
- transcript arrays are produced by hybridizing detectably labeled polynucleotides representing the mRNA transcripts present in a cell (e.g., fluorescently labeled cDNA synthesized from total cell mRNA) to a microarray.
- the cDNA or RNA probe can be synthesized in the absence of detectable label and may be labeled subsequently, e.g., by incorporating biotinylated dNTPs or rNTP, or some similar means (e.g., photo-cross-linking a psoralen derivative of biotin to RNAs), followed by addition of labeled streptavidin (e.g., phycoerythrin-conjugated streptavidin) or the equivalent.
- the label for the probe may be selected from the group consisting of biotin, fluorescent, radioactive, and enzymatic labels.
- fluorophores When fluorescently-labeled probes are used, many suitable fluorophores are known, including fiuorescein, lissamine, phycoerythrin, rhodamine (Perkin Elmer Cetus), Cy2, Cy3, Cy3.5, Cy5, Cy5.5, Cy7, FluorX (Amersham) and others (see, e.g., Kricka, Nonisotopic DNA Probe Techniques (Academic Press San Diego, Calif, 1992). It will be appreciated that pairs of fluorophores are chosen that have distinct emission spectra so that they can be easily distinguished. In another embodiment, a label other than a fluorescent label is used.
- a radioactive label or a pair of radioactive labels with distinct emission spectra, can be used (see Zhao et al, Gene 156:207 (1995); Pietu et al, Genome Res. 6:492 (1996); see also, EXAMPLE 21).
- 32 P can be used.
- These methods of attaching transcripts usually attach specific polynucleotide sequences to very small specific areas of a solid support, such as micro-wells of a DNA chip.
- These hybridization formats are micro-scale versions of the conventional "reverse dot blot” and “sandwich” hybridization systems. The micro-formatted hybridization can be used to carry out “sequencing by hybridization” (see, Barinaga, Science 253: 1489 (1991); Bains, Bio/Technology 10: 757-758 (1992).
- Sequencing by hybridization makes use of all possible n-nucleotide oligomers (n-mers) to identify n-mers in an unknown DNA sample, which are subsequently aligned by algorithm analysis to produce the DNA sequence (see, U.S. Pat. No. 5,202,231; see also, United Kingdom patent application GB 8810400 (1988); Southern et al, Genomics 13: 1008 (1992); Fodor et al, Nature 364: 555-556 (1993); Fodor et al, Science 251: 767-773 (1991); U.S. Pat. No. 5,143,854.
- Probes can be synthesized, in whole or in part, on the surface of a substrate using a chemical coupling procedure and a piezoelectric printing apparatus, such as that described in PCT publication WO 95/251116 (Baldeschweiler et al).
- the probe can be synthesized on a substrate surface using a self-addressable electronic device that controls when reagents are added (U.S. Pat. No. 5,605,662).
- the probes do not have to be directly bound to the substrate, but rather can be bound to the substrate through a linker group.
- the linker groups are typically about 6 to 50 atoms long to provide exposure to the attached polynucleotide probe.
- Preferred linker groups include ethylene glycol oligomers, diamines, diacids and the like.
- Reactive groups on the substrate surface react with one of the terminal portions of the linker to bind the linker to the substrate. The other terminal portion of the linker is then functionalized for binding the polynucleotide probe.
- VLSIPS Very Large Scale Immobilized Polymer Synthesis
- DNA deoxyribonucleic acid array chips
- GENECHIPTM Kozal et al Nature Medicine 2: 753-759 (1996).
- VLSIPS technology is disclosed in U.S. Pat. No. 5,143,854, PCT International patent applications WO 90/15070), WO 92/10092, and WO 95/11995; and Fodor et al, Science 251 : 767-777(1991).
- nucleic acid hybridization and wash conditions are chosen so that the probe "specifically binds" or “specifically hybridizes” to a specific array site, i.e., the probe hybridizes, duplexes or binds to a sequence array site with a complementary nucleic acid sequence but does not hybridize to a site with a non-complementary nucleic acid sequence.
- one polynucleotide sequence is considered complementary to another when, if the shorter of the polynucleotides is less than or equal to 25 bases, there are no mismatches using standard base- pairing rules or, if the shorter of the polynucleotides is longer than 25 bases, there is no more than a 5% mismatch.
- the polynucleotides are perfectly complementary (no mismatches). It can easily be demonstrated that specific hybridization conditions result in specific hybridization by carrying out a hybridization assay including negative controls. Optimal hybridization conditions will depend on the length (e.g., oligomer versus polynucleotide greater than 200 bases) and type (e.g., RNA, DNA, PNA) of labeled probe and immobilized polynucleotide or oligonucleotide. General parameters for specific (i.e., stringent) hybridization conditions for nucleic acids are described in Ausubel et al, Current Protocols in Molecular Biology (Greene Publishing and Wiley-Interscience, New York 1987).
- Useful hybridization conditions are also provided in, e.g., Tijessen, Hybridization With Nucleic Acid Probes, (Elsevier Science Publishers B.V., 1993) and Kricka, Nonisotopic DNA Probe Techniques, (Academic Press, San Diego, Calif, 1992).
- cDNA complementary to the RNA of a cell is made and hybridized to a microarray under suitable hybridization conditions, the level of hybridization to the site in the array corresponding to any particular gene will reflect the prevalence in the cell of RNA transcribed from that gene.
- the site on the array corresponding to a gene i.e., capable of specifically binding the product of the gene
- a gene for which the encoded mRNA is prevalent will have a relatively strong signal.
- U.S. Pat. No, 6,183,968 discloses polynucleotide probes that can be used as hybridizable array elements in a microarray, each of the polynucleotide probes having at least a portion of a gene which encodes a protein associated with cell proliferation or a receptor.
- the fluorescence emissions at each site of a transcript array can be, preferably, detected by scanning confocal laser microscopy. In one embodiment, a separate scan, using the appropriate excitation line, is carried out for each of the two fluorophores used.
- a laser can be used that allows simultaneous specimen illumination at wavelengths specific to the two fluorophores and emissions from the two fluorophores can be analyzed simultaneously (see Shalon et al, Genome Research 6:639-645 (1996)). Signals are recorded and, preferably, analyzed by computer, using commercially available methods.
- the abundance sort program of the invention described in U.S. Pat. No. 5,840,484 can be used to tabulate and sort by frequency the mRNA transcripts corresponding to each gene identified. Since some of the polynucleotide sequences are identified solely based on expression levels, it is not essential to know a priori the function of a particular gene in solid tumor stem cells.
- Transcript image comparisons can be obtained by methods well known to those skilled in the art. Transcript levels and images can be obtained and compared, for example, by a differential gene expression assay based on a quantitative hybridization of arrayed DNA clones (Nguyen et al. Genomics 29:207-216 (1995), based on the serial analysis of gene expression (SAGE) technology (Velculescu et al. Science 270:484-487 (1995)), based on the polymerase chain reaction (Peng et al. Science 257:967-971(1992), based on a differential amplification protocol (U.S. Pat. No. 5,545,522), or based on electronic analysis, such as comparative gene transcript analysis (U.S. Pat.
- U.S. Pat. No. 6,215,894 discloses a system for scanning biochip arrays includes a unique image array identifier recorded for each array, and a computer-stored record corresponding to each identifier and containing the parameters of the experiment in the array identified by the identifier.
- the system further includes means for accessing a protocol library to retrieve the scamiing protocols associated with the identified arrays and then scanning the arrays in accordance with the respective protocols.
- the resulting image maps generated by the scanners are stored in locations corresponding to the associated identifiers.
- Measurement of the translational state may be performed according to several methods. For example, whole genome monitoring of protein (i.e., the "proteome,”) can be carried out by constructing a microarray in which binding sites comprise immobilized, preferably monoclonal, antibodies specific to a plurality of protein species encoded by the cell genome. [161] Use of microarrays.
- the microarrays describe above can be employed in several applications including solid tumor cancer diagnostics, prognostics and treatment regimens, drug discovery and development, toxicological and carcinogenicity studies, forensics, pharmacogenomics and the like.
- the microarray is used to monitor the progression of disease. Physicians can assess and catalog the differences in gene expression between healthy and cancerous tissues by analyzing changes in patterns of gene expression compared with solid tumor stem cells from the patient. Thus, cancer can be diagnosed at earlier stages before the patient is symptomatic.
- the invention can also be used to monitor the efficacy of treatment.
- the microarray is employed to "fine tune" the treatment regimen. A dosage is established that causes a change in genetic expression patterns indicative of successful treatment. Expression patterns associated with undesirable side effects are avoided. This approach may be more sensitive and rapid than waiting for the patient to show inadequate improvement, or to manifest side effects, before altering the course of treatment.
- 6,218,122, 6,165,709, and 6,146,830 discloses methods for identifying targets of a drug in a cell by comparing (i) the effects of the drug on a wild-type cell, (ii) the effects on a wild-type cell of modifications to a putative target of the drug, and (iii) the effects of the drug on a wild-type cell which has had the putative target modified of the drug.
- the effects on the cell can be determined by measuring gene expression, protein abundances, protein activities, or a combination of such measurements.
- modifications to a putative target in the cell can be made by modifications to the genes encoding the target, modification to abundances of RNAs encoding the target, modifications to abundances of target proteins, or modifications to activities of the target proteins.
- the present invention provides an improvement to these methods of drug discovery by providing the tumorigenic solid tumor stem cells, for a more precise drug discovery program.
- An "expression profile" comprises measurement of a plurality of cellular constituents that indicate aspects of the biological state of a cell. Such measurements may include, e.g., RNA or protein abundances or activity levels. Aspects of the biological state of a cell of a subject, for example, the transcriptional state, the translational state, or the activity state, are measured.
- the collection of these measurements is called the "diagnostic profile”. Aspects of the biological state of a cell which are similar to those measured in the diagnostic profile, e.g., the transcriptional state, are measured in an analogous subject or subjects in response to a known correlated disease state or, if therapeutic efficacy is being monitored, in response to a known, correlated effect of a therapy.
- the collection of these measurements optionally graphically represented, is called herein the "response profile”.
- the response profiles are interpolated to predict response profiles for all levels of protein activity within the range of protein activity measured. In cases where therapeutic efficacy is to be monitored, the response profile may be correlated to a beneficial effect, an adverse effect, such as a toxic effect, or to both beneficial and adverse effects.
- protein activities result from protein abundances; protein abundances result from translation of mRNA (balanced against protein degradation); and mRNA abundances result from transcription of DNA (balanced against mRNA degradation). Therefore, genetic level modifications to a cellular DNA constituent alters transcribed mRNA abundances, translated protein abundances, and ultimately protein activities. RNA level modifications similarly alter RNA abundance and protein abundances and activities. Protein level modifications alter protein abundances and activities. Finally, protein activity modifications are the most targeted modification methods. As is commonly appreciated, it is ultimately protein activities (and the activities of catalytically active RNAs) that cause cellular transformations and effects. Also, most drugs act by altering protein activities.
- cDNAs from two different cells are hybridized to the binding sites of the microarray.
- therapeutic efficacy e.g., in response to drugs
- one cell is exposed to a therapy and another cell of the same type is not exposed to the therapy.
- another cell of the same type is not exposed to the therapy.
- disease states one cell exhibits a particular level of disease state and another cell of the same type does not exhibit the disease state (or the level thereof).
- the cDNA derived from each of the two cell types are differently labeled so that they can be distinguished.
- cDNA from a cell treated with a drug is synthesized using a fluorescein- labeled dNTP
- cDNA from a second cell, not drug-exposed is synthesized using a rhodamine-labeled dNTP.
- 6,194,158 for a diagnostic assay for cancer with a DNA chip of specific sequences for measuring expression levels of certain sequences within a cancer cell to determine whether expression is up- or down-regulated.
- the DNA chip comprising nucleotide sequences capable of hybridizing to one or more members of a panel of DNA sequences may be synthesized using commonly available techniques. mRNA is isolated from a normal, non-cancer cell and a cancer cell and hybridized to the DNA chip comprising one of more of the sequences from the panel. Hybridization is then detected by any of the available methods. In such a manner, sequences that are either overexpressed or underexpressed in a cancer cell as compared to a normal cell are.
- mRNA from a cancer cell that has been contacted with a compound may be hybridized to sequences on the DNA chip to determine whether that compound affects expression of a particular sequence.
- the present invention provides an improvement over this method, in that the "cancer cell" from which mRNA can be isolated is the tumorigenic solid tumor stem cell of the invention.
- HSC hematopoietic stem cells
- microarrays of genomic DNA from solid tumor stem cells can be probed for single nucleotide polymorphisms (SNP), to localize the sites of genetic mutations that cause cells to become precancerous or tumorigenic.
- SNP single nucleotide polymorphisms
- the solid tumor stem cells of the invention can be used to raise anti-cancer cell antibodies.
- the method involves obtaining an enriched population of solid tumor stem cells or isolated solid tumor stem cells; treating the population to prevent cell replication (for example, by irradiation); and administering the treated cell to a human or animal subject in an amount effective for inducing an immune response to solid tumor stem cells.
- an effective dose of cells to be injected or orally administered see, U.S. Pat. No. 6,218,166, 6,207,147, and 6,156,305, incorporated herein by reference.
- the method involves obtaining an enriched population of solid tumor stem cells or isolated solid tumor stem cells; mixing the tumor stem cells in an in vitro culture with immune effector cells (according to immunological methods known in the art) from a human subject or host animal in which the antibody is to be raised; removing the immune effector cells from the culture; and transplanting the immune effector cells into a host animal in a dose that is effective to stimulate an immune response in the animal.
- immune effector cells according to immunological methods known in the art
- Monoclonal antibodies to solid tumor stem cells may be prepared using any technique which provides for the production of antibody molecules by continuous cell lines in culture. These include, but are not limited to, the hybridoma technique, the human B-cell hybridoma technique, and the EBV-hybridoma technique (see, e.g., Kozbor, D. et al, J. Immunol. Methods 81:31-42 (1985); Cote RJ et al. Proc. Natl. Acad. Sci. 80:2026-2030 (1983); and Cole SP et al. Mol. Cell Biol 62:109-120 (1984)).
- chimeric antibodies such as the splicing of mouse antibody genes to human antibody genes to obtain a molecule with appropriate antigen specificity and biological activity, can be used (see, e.g., Morrison SL et al. Proc. Natl. Acad. Sci. 81:6851-6855 (1984); Neuberger MS etal. Nature 312:604-608 (1984); and Takeda S et al. Nature 314:452-454 (1985)).
- the antibody can also be a humanized antibody.
- humanized antibody refers to antibody molecules in which the amino acid sequence in the non-antigen binding regions has been altered so that the antibody more closely resembles a human antibody, and still retains its original binding ability. Antibodies are humanized so that they are less immunogenic and therefore persist longer when administered therapeutically to a patient. *
- Human antibodies can be generated using the XenoMouseTM technology from Abgenix (Fremont, Calif, USA), which enables the generation and selection of high affinity, fully human antibody product candidates to essentially any disease target appropriate for antibody therapy. See, U.S. Pat. No. 6,235,883, 6,207,418, 6,162,963, 6,150,584, 6,130,364, 6,114,598, 6,091,001, 6,075,181, 5,998,209, 5,985,615, 5,939,598, and 5,916,771, each incorporated by reference; Yang X et al, Crit Rev Oncol Hemato 38(1): 17-23 (2001); Chadd HE & Chamow SM.
- Antibodies with fully human protein sequences are generated using genetically engineered strains of mice in which mouse antibody gene expression is suppressed and functionally replaced with human antibody gene expression, while leaving intact the rest of the mouse immune system.
- the generation of antibodies directed against markers present in or on the solid tumor stem cells of the invention can be used as a method of identifying targets for drug development.
- the antibodies that are raised in an immune response to the solid tumor stem cells can be used to identify antigenic proteins on the solid tumor stem cells using methods known in the art (Harlow, Using Antibodies: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1999)) and can further be used to identify polynucleotides coding for such proteins (Sambrook et al, Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Press, Cold Spring Harbor, New York, 1989); Current Protocols in Molecular Biology, Ausubel et al, eds., (Wiley Interscience, New York, 1993)).
- the proteins and polynucleotides can be compared with other proteins and polynucleotides previously identified to be involved in cancer.
- the XenoMouseTM technology to produce fully human antibodies can be used to generate antibodies directed against drug development targets (see, Jeffrey Krasner, Boston Globe (July 25, 2001) at F4).
- the present invention provides an improvement to these antibody-based methods of drug discovery by providing the tumorigenic solid tumor stem cells, to which the immune response is raised, for a more precise drug discovery program.
- methods for raising an immune response can take advantage of the "stem cell” qualities of the solid tumor stem cell of the invention.
- the immune response can be directed against cancer cells, as shown by standard immunological methods.
- the solid tumor stem cells (enriched populations of isolated cells) or proteins can be contacted with o dendritic cells in culture, antigen presenting cells in culture, or antigen presenting cells and T cells in culture. Then antigen-stimulated cells are infused back into the patient.
- the solid tumor stem cells of the invention can be genetically engineered to promote an immune response against the tumor stem cells.
- hematopoietic stem cells can be engineered to contain a T-cell receptor targeting a tumor stem cell antigen. See, U.S. Pat. Nos. 5,914,108 and 5,928,638 incorporated by reference.
- T cell receptors that recognize antigens expressed by tumor stem cells can be identified, then cloned into hematopoietic stem cells.
- the engineered hematopoietic stem cells can then be transplanted into a patient and allowed to engraft, giving rise to large numbers of T cells that express receptors recognizing the tumor stem cells. By increasing the numbers of tumor stem cell-specific T cells the anti-tumor immune response can be potentiated.
- Tumor stem cells can be used as a vaccine by killing a patient's tumor stem cells, such as by irradiation, and readministering the killed stem cells back into the patient in a physiological and immunologically acceptable carrier, for the purpose of generating an immune response against the tumor stem cells. See, U.S. Pat No. 4,960,716, in which antibodies were raised to membrane vesicle preparations of breast carcinoma cell cells; U.S. Pat No.
- Dendritic cells from a patient can be cultured in vitro and killed tumor stem cells from the same patient can be added to the cultures to stimulate the dendritic cells.
- the activated dendritic cells presenting tumor stem cell antigens, can then be re-administered to the patient to stimulate the patient's anti-tumor response.
- tumor stem cells can be administered to an animal such as a mouse, rat, hamster, goat, sheep, rabbit, or donkey to generate antibodies against the tumor stem cells.
- monoclonal anti-tumor stem cell antibodies are made in mouse, rat, or hamster. Monoclonal antibodies that are made in this way can then be administered to patients, or first humanized (as described above) and then administered to patients, to promote an immune response against the tumor stem cells in the patient.
- adenoviral vectors have proven especially useful for gene transfer into eukaryotic cells for vaccine development. Graham FL & Prevec L, In Vaccines: New Approaches to Immunological Problems, Ellis RV ed., 363-390 (Butterworth-Heinemann, Boston, 1992).
- Probe for scanning microarrays The complete sequencing of the human genome makes possible the identification of the genes expressed by a particular population of cells. Probes from enriched populations of tumor stem cells can be made using methods known to the art (see, Wang et al, Nature Biotechnology 18: 457 (2000 ⁇ ). Analysis of gene expression patterns and protein expression patterns for tumor stem cells and tumor cell progeny populations can be preformed by comparing results to known Gene Pattern Databases or to known Protein Pattern Databases (for example, PROSITE, PRINTS: Protein Motif Fingerprint Database, BLOCKS, PFAM, DOMO, PRODOM, or other databases).
- BCM Search Launcher General Protein Sequence/Pattern Searches (Baylor College of Medicine, Human Genome Sequencing Center, One Baylor Plaza, Houston, TX).
- CGC Genetics Computer Group, Inc.
- DNA STRIDER DNA STRIDER
- the factors involved in the proliferation, differentiation, or survival of tumor stem cells and tumor stem cell progeny, or their responses to biological agents can be isolated either by constructing cDNA for libraries or to probe microarrays from tumor stem cells, or tumor stem cell, non-tumorigenic cancer cells, or normal tumor cells using techniques known in the art.
- cDNA can also be made from any of the different populations after exposure to biological agents or drugs to determine the response to such manipulations.
- the libraries from cells of one population are compared with those of cells of different populations to determine the sequence of gene expression during development and to reveal the effects of various biological agents or to reveal new biological agents that alter gene expression in cancer cells.
- the libraries are prepared from neoplastic tissue
- genetic factors may be identified that play a role in the cause of cancer cell growth, for example, by comparing the libraries from the cancerous tissue with those from normal tissue. This information can be used in the design of anti-cancer therapies. Additionally, probes can be identified for use in the diagnosis of various cancers or for use in identifying cells at a particular stage in tumor development.
- Tumor associated antigens include for example, BCA 225 (U.S. Pat. No.
- Bladder Tumor Associated Antigen BTA stat test, ARUP Laboratories, Salt Lake City, UT); tumor-associated antigen CA125 (Wagner et al, Hybridoma 16(1): 33-40 (1997)); 22-1-1 Ag, YH 206, GA 733, CA 125, carcinoembryonic antigen, and sialyl Le x (Sonoda et al, Cancer 77(8): 1501-1509 (1996)).
- cancerous cells can be looked for in the patient's bone marrow. See, for example, Bruan et al, New Engl J. Med. (Feb. 24, 2000)).
- Such methods may, for example, utilize reagents such as VEGF nucleotide sequences and VEGF antibodies.
- reagents such as VEGF nucleotide sequences and VEGF antibodies.
- such reagents may be used, for example, for: (1) the detection of the presence or over-expression of VEGF mRNA relative to the non-carcinogenic tissue state; (2) the detection of an over-abundance of VEGF protein relative to the non-carcinogenic tissue state; (3) the detection of hypoxic conditions in the tumor mass; (4) the detection of the expression of VEGF tyrosine kinase receptors and other angiogenic receptors in adjacent endothelial tissues; and (5) the detection of the expression of oncogenes.
- the methods may be performed, for example, by utilizing pre-packaged diagnostic kits comprising at least one specific VEGF nucleotide sequence or VEGF antibody reagent described herein, which may be conveniently used, e.g., in clinical settings, to diagnose patients at risk for tumor angiogenesis and metastasis.
- the expression of different oncogene alleles may be assessed using these methods.
- the additional information obtained regarding the expression of other markers provides guidance for the design of appropriate therapies to inhibit angiogenesis or tumor proliferation tailored to the molecular stage of the cancer in a particular patient.
- the invention provides a method for identifying a test compound for reducing solid tumors.
- the practice of the method can be further determined using the guidance provided in the EXAMPLES below.
- the steps of the method include assaying the response of tumor cells to biological agent and determining the effects of the biological agent on the tumor stem cell.
- the invention provides improved methods of drug discovery by the use of the solid tumor stem cells of the invention.
- drugs are screened to determine the binding of test compounds to receptors, in which the binding activates a cell's biological pathway to cause expression of reporter polypeptides.
- the reporter polypeptides are coded for on recombinant polypeptides, in which the coding polynucleotide is in operable linkage with a promoter.
- operably associated or “operably linked,” as used herein, refer to functionally related polynucleotides.
- a promoter is operably associated or operably linked with a coding sequence if the promoter controls the translation of the encoded polypeptide.
- operably associated or operably linked nucleic acid sequences can be contiguous and in the same reading frame, certain genetic elements, e.g., repressor genes, are not contiguously linked to the sequence encoding the polypeptide but still bind to operator sequences that control expression of the polypeptide.
- the detectable signal can be fluorescence, absorbence, or luminescence, depending on the reporter polypeptide, which can be, for example, luciferase (firefly luciferase, Vibrio fisceri luciferase, or Xenorhabdus luminescens luciferase), green fluorescent protein, green fluorescent protein variant, chloramphenicol acetyltransferase, ⁇ -glucuronidase, ⁇ -galactosidase, neomycin phosphotransferase, guanine xanthine phosphoribosyltransferase, thymidine kinase, ⁇ -lactamase, alkaline phosphatase, invertase, amylase (for yeast based assays) human growth hormone (for activity based assays).
- luciferase firefly luciferase, Vibrio fisceri luciferase, or
- the fluorescent detectable signal can be fluorescence resonance energy transfer (FRET), bioluminescence resonance energy transfer (BRET), time-resolved fluorescence (TRF) or fluorescence polarization (FP).
- FRET fluorescence resonance energy transfer
- BRET bioluminescence resonance energy transfer
- TRF time-resolved fluorescence
- FP fluorescence polarization
- the detectable signal is detected by a machine such as a fluorometer, luminometer, fluorescence microplate reader, dual- monochromator microplate spectrofluorometer, spectrophotometer, confocal microscope (laser scanner), or a charge-coupled device (CCD).
- the detectable signal is determined by comparing the amount of signal produced when the reporter polypeptide is expressed in the tumor stem cell with the signal produced when the reporter polypeptide is not expressed in the tumor stem cell.
- Another technique for drug screening provides for high throughput screening of compounds (see, e.g., PCT application WO 84/03564.)
- a solid substrate such as plastic pins or some other surface.
- the test compounds are reacted with solid tumor stem cells, or portions thereof, and washed.
- Bound solid tumor stem cells are then detected by methods well known in the art, using commercially available machinery and methods, for example, the Automated Assay Optimization (AAO) software platforms (Beckman, USA) that interface with liquid handlers to enable direct statistical analysis that optimizes the assays; modular systems from CRS Robotics Corp.
- AAO Automated Assay Optimization
- the assays measure a response the target cells (solid tumor stem cells or genetically modified solid tumor stem cells) that provides detectable evidence that the test compound may be efficacious.
- the detectable signal is compared to control cells and the detectable signal identified by subtraction analysis.
- the relative abundance of the differences between the "targeted” and “untargeted” aliquots are simultaneously compared using a "subtraction” analysis (differential analysis) technique such as differential display, representational difference analysis (RDA), GEM-Gene Expression Microarrays (U.S. Pat. No. 5,545,531), suppressive subtraction hybridization (SSH) and direct sequencing (PCT patent application WO 96/17957).
- the subtraction analysis can include the methods of differential display, representational differential analysis (RDA), suppressive subtraction hybridization (SSH), serial analysis of gene expression (SAGE), gene expression microarray (GEM), nucleic acid chip technology, or direct sequencing.
- the solid tumor stem cell of the invention is particularly useful in the drug development process because solid tumor stem cells provide a limited and enriched set of targets for drug development.
- One of the most important steps in rational drug design is the identification of a target, the molecule with which the drug itself interacts. Frequently, the target will be a receptor on or in a tumorigenic solid tumor stem cell.
- the genetically modified solid tumor stem cell of the invention is particularly useful in the drug development.
- the genetically modified stem cell can contain polynucleotide with a promoter operably linked to the polynucleotide encoding a reporter polypeptide.
- the reporter polypeptide is expressed in the tumor stem cell after a receptor of the tumor stem cell is activated by binding to a test compound or inactivated by binding to a test compound.
- Such a detectable signal makes the genetically modified solid tumor stem cell appropriate for use in high throughput screening (HTS).
- the detectable signal can be a result of a positive selection or a negative selection.
- the positive selection includes manipulations that test the ability of cells to survive under specific culture conditions, ability to express a specific factor, changes in cell structure, or differential gene expression. The selection can be based on the ability of the solid tumor stem cells or genetically modified solid tumor stem cells to:
- This factor can be anything that is accessible to measurement, including but not limited to, secreted molecules, cell surface molecules, soluble and insoluble molecules, binding activities, activities that induce activities on other cells or induce other organic or inorganic chemical reactions.
- the invention provides an improved method of ascertaining propensity for malignancy, monitoring the progress of chemotherapy or other anticancer therapy, screening for re-occurrence of cancer, or other similar detection of present or potential cancer, where such method detects for the expression of at least one gene which is over- or under- expressed in a potential cancer cell, as compared with either a solid tumor stem cell isolated from the patient or a collection of solid tumor stem cells.
- the method is the assaying of a biological sample (such as from the patient) to be tested for a signal indicating the transcription of a significant (by comparison with the solid tumor stem cell) polynucleotide transcript.
- the invention provides an article of manufacture (a system or a kit), comprising packaging material and a primary reagent contained within said packaging material.
- the primary reagent is solid tumor stem cell preparation as described above.
- the packaging material includes a label that indicates that the primary reagent can be used for identifying an agent for reducing solid tumors.
- kits for determining the activity level of a particular polynucleotide or protein in a cell.
- kits contain arrays or microarrays containing a solid phase, e.g., a surface, to which are bound, either directly or indirectly, solid tumor stem cells (enriched populations of or isolated), polynucleotides extracted from such solid tumor stem cells, or proteins extracted from such solid tumor stem cells.
- the kit may also contain probes that are hybridized or bound to the solid tumor stem cell components at a known location of the solid phase. These probes consist of nucleic acids of known, different sequence, with each nucleic acid being capable of hybridizing to an RNA species or to a cDNA species derived therefrom.
- the probes contained in the kits of this invention are nucleic acids capable of hybridizing specifically to nucleic acid sequences derived from RNA species which are known to increase or decrease in response to perturbations correlated to the particular diseases or therapies to be monitored by the kit.
- the probes contained in the kits of this invention preferably substantially exclude nucleic acids which hybridize to RNA species that are not increased or decreased in response to perturbations correlated to the particular levels of disease states or therapeutic effects to be determined by the kit.
- Phenotypically distinct subsets of tumor cells can be isolated by any suitable means known in the art, including FACS using a fluorochrome conjugated marker-binding reagent. Any other suitable method including attachment to and disattachment from solid phase, is also within the scope of the invention.
- Procedures for separation may include magnetic separation, using antibody-coated magnetic beads, affinity chromatography and "panning" with antibody attached to a solid matrix, e.g. plate, or other convenient technique.
- Techniques providing accurate separation include fluorescence activated cell sorters, which can have varying degrees of sophistication, such as multiple color channels, low angle and obtuse light scattering detecting channels, impedance channels, etc.
- Dead cells may be eliminated by selection with dyes that bind dead cells (such as propidium iodide (PI), or 7-AAD). Any technique may be employed that is not unduly detrimental to the viability of the selected cells.
- the marker-binding reagent can be directly or indirectly conjugated to a magnetic reagent, such as a superparamagnetic microparticle (microparticle). Direct conjugation to a magnetic particle is achieved by use of various chemical linking groups, as known in the art.
- Antibody can be coupled to the microparticles through side chain amino or sufhydryl groups and heterofunctional cross-linking reagents. A large number of heterofunctional compounds are available for linking to entities.
- a preferred linking group is 3-(2-pyridyidithio)propionic acid N-hydroxysuccinimide ester (SPDP) or 4-(N-maleimidomethyl)-cyclohexane-l -carboxylic acid N-hydroxysuccinimide ester (SMCC) with a reactive sulfhydryl group on the antibody and a reactive amino group on the magnetic particle.
- the marker-binding reagent is indirectly coupled to the magnetic particles.
- the marker-binding reagent is directly conjugated to a hapten, and hapten-specific, second stage antibodies are conjugated to the particles.
- Suitable haptens include digoxin, digoxigenin, FITC, dinitrophenyl, nitrophenyl, avidin, biotin, etc. Methods for conjugation of the hapten to a protein, i.e. are known in the art, and kits for such conjugations are commercially available. Fluorochrome labeled antibodies are useful for FACS separation, magnetic particles for immunomagnetic selection, particularly high gradient magnetic selection (HGMS), etc. Exemplary magnetic separation devices are described in PCT patent applications WO 90/07380 and WO 96/09550 , and European patent 0 438 520. [213] We have extensively studied the tumors formed by one of the primary tumors and one of the malignant pleural effusion cells.
- 520C9 is known to recognize c-erbB-2 (HER-2/neu). Ring et al, Molecular Immunology 28:915 (1991). See also, U.S. Pat. No. 4,753,894, which discloses murine monoclonal antibodies that bind selectively to human breast cancer cells.
- Four populations of cells were identifiable. There was a small population of cells that expressed both markers 520C9 and CD44, a population that expressed either marker alone, as well as a population that expressed neither marker. Cells were isolated with regard to CD44 expression (FIG. 2). CD44 + or CD44 " cells were tested for their ability to proliferate.
- Marker CD44 + tumor cells but not marker CD44 " tumor cells, were able to form colonies in vitro and tumors in vivo (TABLE 1). Note that isolation of CD44 + cells results in at least a 2.5-fold purification of the tumorigenic cells.
- solid tumor cells are phenotypically and functionally heterogeneous; some tumor cells are tumorigenic, while others have limited proliferative potential and do not form tumors upon transplantation;
- This EXAMPLE shows that that the clonogenic breast cancer tumor cell from two tumors express CD44.
- Other markers also allow the further purification of the breast cancer stem cell.
- U.S. Pat. No. 4,753,894 discloses murine monoclonal antibodies that bind selectively to human breast cancer cells. Combinations of these markers with CD44 permit increased enrichment of the tumor stem cells beyond what was achieved with CD44 alone.
- CD44 + (tumorigenic) cells are also B38.1 + .
- B38.1 + cells are also B38.1 + .
- Annexin, Notch-4, and CD24 expression is heterogeneous by the B38.1 + cells.
- the purpose of this EXAMPLE is to provide preliminary evidence that in at least two different tumors, Notch 4 is expressed by a minority of the tumorigenic cells.
- Cells from tumor Tl and tumor T2 from EXAMPLE 1 were analyzed for expression of Notch 4.
- Cells were stained with an anti-Notch 4 polyclonal antibody and analyzed by FACS. 5-15% of cells expressed detectable levels of Notch 4.
- different populations of non-tumorigenic cells express different Notch ligands and members of the Fringe family.
- Notch 1, Notch 3 and Notch 4, but not Notch 2 were expressed by both normal breast cells and breast tumor cells.
- a Notch recombinant ligand or agonist peptides of the ligand were added to the medium in cultures of normal mammary epithelial cells.
- Both Notch agonists stimulated the survival/proliferation of single cells: in the presence of the Notch agonists, 2-3 times more colonies formed and they included a higher percentage of large, mixed colonies (40% versus 20%).
- single cells were plated at clonal density, we obtained two kinds of colonies. There were large colonies made up of hundreds to thousands of cells, presumably arising from solid tumor stem cells, that were of a mixture of myoepithelial cells and ductal epithelial cells. There were also smaller colonies of cells that appeared to contain only a single lineage and that probably represented the progeny of restricted progenitors.
- Notch 4 expression was examined in breast cancer tumor cells. High levels of Notch 4 were expressed on a minority of the tumor cells. When the B38.1 population, which identifies the tumorigenic population, was analyzed for Notch 4 expression, a distinct minor population of cells that were B38.ll° w , Notch 4 + became apparent.
- Notch 4 + and Notch 4" cells were sorted them in vitro. Surprisingly, neither population grew in tissue culture. There were two possible explanations. First, it was possible that interaction between the two populations of cells was required for cell growth. Next, the antibody may be either an agonist or an antagonist of Notch 4 and may inhibit tumor cell growth. To distinguish between these possibilities, tumor cells were incubated with the anti-Notch 4 antibody, and then assayed in vitro. Breast cancer cells were placed in tissue culture after exposure to an anti-Notch 4 antibody. Cells were incubated on ice for 1 hr.
- Tumor cells were exposed to the anti-Notch 4 antibody and then the cells were injected into mice to determine whether the antibody inhibits tumor formation. 35,000 tumor cells were incubated with no antibody, the anti-Notch 4 antibody, or the anti-Notch 4 antibody that had been preincubated with the peptide used to generate the antibody. After two weeks, the diameter of tumors formed by the cells exposed to the anti-Notch 4 antibody was 40% smaller than the control tumors. Thus the cells that were exposed to the anti-Notch 4 antibody formed smaller tumors than cells that were exposed to the anti-Notch 4 antibody that was incubated with the peptide used to generate the antibody.
- the same population was found to be the clonogenic in the in vitro assay.
- This B38.1 + population can be further subdivided using several additional markers.
- In vitro and in vivo evidence strongly implicates the Notch pathway, especially Notch 4, as playing a central pathway in tumorigenesis.
- a human tumor growing in the mouse model was harvested, made into a single cell suspension, and analyzed by FACS. There was heterogeneity of expression of cell surface markers by tumor cells. Initially, breast cancer cells isolated from a malignant pleural effusion were separated into groups based upon CD44 expression. Cells were analyzed for expression of markers 520C9 and CD44. Three populations of cells were identifiable. There was a small population of cells that expressed both markers 520C9 and CD44, a population that expressed either marker alone, as well as a population that expressed neither marker. Cells were isolated with regard to CD44 expression. CD44 4" or CD44 " cells were tested for their ability to proliferate. Marker CD44 + tumor cells, but not marker CD44 " tumor cells, were able to form colonies in vitro and tumors in vivo (TABLE 3). Note that isolation of CD44 + cells results in a 2-fold enrichment of the tumorigenic cells.
- mice were injected with 50,000 CD24 "1" or CD24 " ' 10 cells. The formation of tumors was determined 4 weeks after injection.
- tumor cells are phenotypically and functionally heterogeneous
- the phenotype of the tumorigenic cell is determined for each different tumor. For analysis, a tumor is removed from the mice and made into a single cell suspension. We first confirm the solid tumor stem cell model of the invention and that the phenotype of tumorigenic cells is indeed B38.1 "1" CD44 + CD24 " ⁇ o . In all tumors, we do limiting dilution analysis of cells isolated by FACS based upon expression of these markers.
- the antibody cocktail that leads to the greatest purification of the putative tumorigenic cell follows: anti-38.1-APC, anti-CD44-FITC, and anti-CD24-PE, anti-CD3-cytochrome, anti-CD2-cytochrome, anti-CD 10-cytochrome, , anti-CD 14-cytochrome, anti-CD 16-cytochrome, anti-CD31-cytochrome, CD45-cytochrome, CD140b-cytochrome, anti-CD64-cytochrome, anti-ESA-Phar-red and 7AAD (a viability marker). All antibodies labeled with cytochrome are considered to be part of a lineage cocktail (LINEAGE " ).
- FACS is used to isolate the putative breast cancer stem cell, which in xenograft tumor Tl are the CD44 + CD24 "/l0 LINEAGE " population of cells , the CD44 + B38.1 + CD24 “/lo LTNEAGE " population of cells are more enriched, and the ESA + CD44 + B38.1 + CD24 "/lo LINEAGE " population of cells are most enriched for the breast cancer stem cell.
- the different populations of malignant cells are tested in the in vivo and in vitro models to confirm that the phenotype of the primary tumorigenic cell does not change while growing in the mouse xenograft model. As we progressively enrich the tumorigenic cells, the number of cells and time needed to form a tumor decreases.
- the Notch protein is a receptor for the growth/survival factors Delta and Jagged (Panin et al, Nature 387(6636): 908-912 (1997); Perron et al, Cellular & Molecular Life Sciences 57(2): 215-23 (2000); Shimizu et al, Journal of Biological Chemistry 274(46): 32961-9 (1999)). In some normal stem cells, Notch is known to play a role in proliferation, survival and differentiation.
- Notch 4 expression in the breast cancer tumor cells was examined. Notch 4 was expressed on the minority of the tumor cells. When the B38.1 population, which identifies the tumorigenic population, was analyzed for Notch 4 expression, a distinct minor population of cells that were B38.1 lo and Notch 4 + became apparent.
- Notch 4 + and Notch 4 cells and analyzed their ability to form colonies in vitro. Surprisingly, neither population grew in tissue culture. There are two possible explanations. First, it is possible that interaction between the two populations of cells is required for cell growth. Alternately, the antibody may be either an agonist or antagonist of Notch 4 and inl ⁇ bition or activation of the receptor may inhibit tumor cell growth.
- tumor cells were incubated with the anti-Notch 4 antibody and then the cells were injected into mice to determine whether the antibody inhibits tumor formation.
- the cells that were exposed to the anti-Notch 4 antibody formed smaller tumors than cells that were exposed to the anti-Notch 4 antibody that was incubated with the peptide used to generate the antibody before addition to the cells.
- Approximately 350,000 tumor cells were incubated with no antibody, the anti-Notch 4 antibody, or the anti-Notch 4 antibody that had been incubated with the peptide used to generate the antibody.
- the diameter of tumors formed by the cells exposed to the anti-Notch 4 antibody was 40% smaller than either of the control tumors.
- the simplest explanation of the in vitro and in vivo assays is that Notch 4 activation promotes proliferation survival of stem cells and that the anti-Notch 4 antibody blocks receptor activation.
- Tl metastatic breast cancer
- T2 primary breast tumor
- the resulting human tumors were then harvested, made into a single cell suspension and analyzed by flow-cytometry for expression of several different antigens.
- Contaminating mouse cells were gated out of the analysis by eliminating cells expressing mouse H-2K (major histocompatibility complex class I) and dead cells were eliminated using a viability dye.
- CD44 + and CD44 " cells were isolated from these in vivo passaged Tl or T2 cells and NOD/SCID mice were injected with CD44 + or CD44 " cells.
- the tumors were also heterogeneous for CD24 expression.
- 200,000 CD24 + or CD24 "/l0 cells were injected into NOD/SCID mice, all mice injected with CD24 " l0 cells grew tumors (TABLE 5). Although no tumors could be detected by palpation in the locations injected with CD24 + cells, two of twelve mice injected with CD24 + cells did contain small growths at the injection site that were detected only upon necropsy. The sites injected with CD24 " ° cells, by contrast, all had tumors greater than 1 cm in diameter that were readily apparent visually and by palpation.
- CD24 Since it is extremely difficult to completely eliminate CD24 " cells from the CD24 + fraction by flow-cytometry, the small growths likely represent contamination by the 1-3% of CD24 " cells that are typically present in the sorted CD24 population. Alternately, the small growths might have arisen from CD24 4" cancer cells that had reduced proliferative capacity. At present we cannot distinguish between these possibilities. Nonetheless, all of the cells that produced palpable tumors in this xenograft model were B38.1+CD44+CD24 710 .
- LINEAGE (CD2, CD3, CD10, CD14, CD16,CD19, CD31, -CD45, -CD64 and -CD140b) markers were found not to be expressed by the cancer cells based on analyses of tumors that had been passaged multiple times in mice. By eliminating LINEAGE "1" cells, normal human leukocytes, endothelial cells, and fibroblasts were eliminated, especially from unpassaged or first passage tumors.
- each of the tumors contained a distinct population of B38.1 + CD44 + CD24 "/l0 cells.
- the frequency of B38.1+CD44+CD24 "/l0 cells was 9.5 ⁇ 4.5 % (mean ⁇ standard deviation) of live human tumor cells.
- the injection sites of B38.1 + CD44+CD24 "/lo LINEAGE " cells and B38.1 + CD44 + CD24 + LTNEAGE " cells were examined by histology.
- the B38.1 + CD44 + CD24 "/lo LINEAGE " injection sites contained tumors greater than 1 cm in diameter while the B38.1 + CD44 + CD24 + LINEAGE " injection sites contained no detectable tumors. Only normal mouse mammary tissue was seen by histology at the sites of the B38.1 + CD44 + CD24 + LrNEAGE " injections (FIG. 7K), whereas the tumors formed by B38.1+CD44 + CD24 "/Io LINEAGE " cells contained malignant cells as judged by morphology in hematoxylin and eosin stained sections (FIG. 7L). Even when B38.1 + CD44 + CD24 + LINEAGE " injection sites were examined after 11 weeks, no tumors were detected.
- B38.1 + CD44 + CD24 " ⁇ o population from unpassaged breast tumor specimens was tumorigenic. Of four independent tumors that were analyzed after being passaged in mice, there were only enough frozen unpassaged cells available of Tl to permit flow-cytometry. In addition, frozen unpassaged cells from a fifth patient (T5) were analyzed. Five percent of unpassaged Tl cells and 35% of unpassaged T5 cells were B38.1 + CD44+CD24 "/lo LINEAGE " .
- B38.1+CD44 + CD24 " l0 L ⁇ NEAGE " (FIG. 71) and B38.1 + CD44 + CD24 + LINEAGE " (FIG. 7F) populations were isolated and injected into each of three NOD/SCID mice.
- the CD24 " l0 population formed tumors from the Tl cells and in 2 of 3 injections from T5 cells, but the CD24 + population never formed tumors, demonstrating that the tumorigenic population identified in the passaged tumors also existed in the unpassaged Tl and T5 samples.
- the frequency of B38.1+CD44+CD24 "/lo LINEAGE " cells was similar in both passaged and unpassaged Tl samples.
- tumorigenic cells were further enriched by selecting the ESA subset of the B38.1 + CD44 + CD24 " l0 population.
- ESA + CD44 + CD24 "/,0 LINEAGE " cells were isolated from Tl (FIG. 8 A), as few as 200 cells from this population were able to give rise to a tumor while injection of 2,000 B38.1 + CD24 "/lo LINEAGE " but ESA " cells failed to form tumors in any case (TABLE 6). At least 10,000 unfractionated cells were required to form any tumors.
- the ESA + B38.1 + CD24 " ⁇ o LrNEAGE " population was at least 50 fold enriched for the ability to form tumors relative to unsorted tumor cells.
- the ESA + B38.1 + CD24 "/lo LINEAGE " population accounted for 2-4% of Tl cells (2.5-5% of cancer cells).
- the ESA + B38.1 + CD24 "/lo LINEAGE " and the non-tumorigenic cells were examined by cytology and both populations consisted of malignant cells that were virtually indistinguishable in appearance.
- the non-tumorigenic cells were capable of forming only small colonies consisting of 2-4 cells that stopped proliferating after a few days (FIG. 9C).
- FIG. 9C the phenotype of the stem cells is not an artifact of the immune-deficient mouse assay. The fact that the phenotypically identical population of cells had increased proliferative ability in both the mouse xenograft model and the in vitro assays shows that this population is the tumorigenic population of cells found in patients with breast cancer.
- B38.1 + CD44 + CD24 "/l0 LINEAGE” tumorigenic cells form tumors that contain additional B38.1 + CD44 + CD24 "/lo LINEAGE " tumorigenic cells as well as phenotypically heterogeneous populations of non-tumorigenic cells.
- Classical models would suggest that tumors that form from B38.1 + CD44 + CD24 " l0 LINEAGE " cells consist solely of expanded numbers of B38. l + CD44 + CD24 "/l0 LINEAGE " cells.
- HER2/neu + B38.1 + CD24-LINEAGE- cells gave rise to tumors in four out of four cases.
- This EXAMPLE shows that there can be differences in the expression of therapeutic targets between the tumorigenic and non-tumorigenic populations.
- tumor cells are phenotypically and functionally heterogeneous
- Notch was a solid tumor stem cell marker
- Notch 4 + and Notch 4 cells and analyzed their ability to form colonies in vitro. Surprisingly, neither population grew in tissue culture.
- the antibody may be either an agonist or antagonist of Notch 4 and inhibition or activation of the receptor may inhibit tumor cell growth.
- unseparated tumor cells were incubated with the anti-Notch 4 antibody, and then assayed for the ability to form colonies in vitro in tissue culture medium containing soluble Delta, a Notch ligand. Delta was essential for colony formation from cells isolated from this tumor. While control cells grew in tissue culture and formed colonies (FIG. 12A), cells incubated with the Notch 4 antibody did not grow (FIG. 12B).
- the breast cancer stem cell comprises a minority of the tumor cells in a breast tumor. It is an object of the invention that gene therapy strategies target these cells (FIG. 13).
- FOG. 13 The breast cancer stem cell comprises a minority of the tumor cells in a breast tumor. It is an object of the invention that gene therapy strategies target these cells (FIG. 13).
- the modified anti-knob and anti-B38.1 antibodies When we mixed the modified anti-knob and anti-B38.1 antibodies together, they became cross-linked and generated the bi-specific conjugate (FIG. 15).
- the anti-fiber antibody part of the conjugate binds to the adenovirus, while the anti-B38.1 moiety binds to the breast cancer stem cell.
- Incubation of the AdLacZ virus with the anti-fiber alone blocks the infectivity of the virus (FIG. 16). If we incubate the virus with the bi-specific conjugate, the infectivity is restored only in the cells that express high levels of the B38.1 antigen (FIG. 18).
- the re-targeting is specific, because it can be inhibited by free B38.1 antibody (FIG. 18).
- RNA is isolated either from freshly purified breast cancer stem cells or from breast cancer stem cells incubated in the presence or absence of various Notch ligands. The RNA is amplified if necessary, such as by PCR or linear RNA amplification Wang et al, Nature Biotechnology. 18: 457-459 (April 2000). Probe are prepared by reverse transcription from an oligo-dT primer, and labeled by incorporating CY3 orC Y5 conjugated nucleotides.
- Gene expression profiles are examined using probe prepared from freshly isolated, uncultured breast cancer cells, as well as from cultured breast cancer cells, such as cells that have been exposed to the appropriate Notch ligands (including Fringe family members, either singly or in combination as determined by which ligands are expressed by the different populations of tumor cells.
- Notch ligands including Fringe family members, either singly or in combination as determined by which ligands are expressed by the different populations of tumor cells.
- To do these assays we expose the cells to a soluble form of Delta or Jagged family members in which the transmembrane region has been deleted, or one of the Fringes. The Fringes are secreted proteins.
- We make recombinant protein of each Notch ligand of the Delta, Jagged and Fringe families from insect cells or mammalian cells transfected with a baculovirus or mammalian expression vector, respectively.
- microarrays hybridized with probe from each test condition are compared and analyzed to gain insights into molecular pathways affected by Notch ligand interactions. For example, if a particular population of cells expresses Delta and Manic Fringe, then one group of breast cancer stem cells is exposed to Delta alone, a second to Delta and Manic Fringe and a third to Manic Fringe alone.
- cDNA is made from each population with Cy5 or Cy3 labeling, and used to probe a microarray chip.
- cDNA from each population is used with cDNA made from cells cultured in control medium and freshly isolated breast cancer cells to probe a microarray chip. Each group is compared 5 times to assure that any differences in expression profiles of the arrayed genes by each test groups are real.
- probe Preparation of probe from cells treated with the anti-Notch 4 antibody.
- An antibody against Notch 4 inhibits growth in vitro and tumorigenesis in vivo. This effect could be explained if the antibody acts as either a Notch-4 agonist or antagonist. Since soluble Delta promotes cancer cell growth in vitro, the antibody most likely is a Notch 4 antagonist.
- probe is made from cells incubated in the presence or absence of the anti-Notch 4 or control irrelevant antibody and the various combinations of the Notch ligands and used for microarray expression analysis as described above. Another control group includes cells incubated with the antibodies and no Notch ligand. Each comparison is performed in at least six independent tests employing independently prepared batches of probe.
- 10 7 cancer cells yielded around 100 ⁇ g of total RNA, which in turn yielded around 3 ⁇ g of poly A + RNA.
- that number of flow-cytometrically purified breast cancer stem cells can be isolated from approximately five-ten 1 cm tumors.
- the breast cancer stem cells represent approximately 5% of the total number of cells within a tumor. It is not practical to isolate more than 10 6 freshly dissociated (uncultured) breast cancer stem cells by flow-cytometry in one day. This would yield less than 0.5 ⁇ g of mRNA from one day of sorting.
- breast cancer stem can be combined from multiple days of sorting to pool enough mRNA to prepare probe from freshly isolated cells, it may not be practical to perform all assays in this manner. Some assays require brief periods of tissue culture. Plating efficiency of the sorted cells is approximately 10%. Thus it may be necessary to enzymatically amplify the template prior to synthesizing probe. This can be done either by PCR or by linear amplification of RNA using T7 RNA polymerase. Our protocol employs 15-18 rounds of PCR to amplify cDNA from small numbers of stem cells. This protocol was used to construct a high quality hematopoietic stem cell (HSC) cDNA library and to make probe from hematopoietic stem cells.
- HSC hematopoietic stem cell
- RNA amplification is produced using T7 RNA polymerase or PCR.
- cDNA is re-synthesized using random hexamers. This cDNA can then be used for probe, or if necessary, additional rounds of amplification can be performed. Both approaches are used to prepare probe from 40,000 MCF-7 cells (a human breast cancer stem cell line). This probe is hybridized to human cDNA microarrays along with probe from unamplified MCF-7 cells. The amplification approach that most closely reproduces the hybridization pattern of the unamplified probe is selected. Then amplification conditions are modified until the amplified probe reproduces the hybridization pattern of the unamplified probe as closely as possible.
- Hybridization patterns are analyzed in the Cancer and Microarray Core facility using their laser scanning system.
- the use of an integrated system for arraying, hybridizing, scanning, and analyzing hybridization patterns in which all components are provided by Genomics Solutions permits a seamless and efficient analysis of hybridization patterns.
- a transcript is differentially expressed if there is at least a 3-fold difference in normalized hybridization levels between probes.
- Hybridization signals from Cy3 and Cy5 labeled probes within a single test are normalized to each other to correct for potential differences in the effective concentration of each probe and replicates of each test are done using the opposite fluor for each group to correct for differences in the amounts or labeling efficiencies of probes.
- Verification of differential expression cDNAs that consistently hybridize to probe from groups of cells but not to probe from the control groups of cells are further characterized. The sequences of these cDNAs are obtained from the Microarray Network. Two approaches are used to confirm the differential expression of candidate genes between cell populations.
- the first is to prepare in situ hybridization probes against candidate genes, and then perform in situ hybridizations on breast cancer stem cells cultured in medium with or without various Notch ligands as described above. In situ hybridizations are then performed on cultured cells.
- the advantage of this approach would be that expression could be compared at the level of individual cells.
- An alternate approach is to design nested PCR primers against candidate genes, and to perform RT-PCR on multiple 1-10-cell aliquots of freshly purified breast cancer stem cells (isolated as described above). By performing RT-PCR on small numbers of cells it is possible to observe a difference in the ability to amplify particular transcripts, even if the "non-expressing" population contains rare expressing cells. We used this approach to demonstrate the differential expression of RGS18 between different subpopulations of multipotent hematopoietic progenitors.
- probe for the microarray analysis is made using cDNA made form the cell line incubated in medium with or without the various Notch ligands or anti Notch 4 or control antibodies. Since a virtually unlimited number of cells can be analyzed, we can make probe that has not been amplified. [295] Finally, cell lines are useful for confirming whether the anti-Notch 4 antibody is an agonist or antagonist. If a cell line is identified that clonogenicity is enhanced by soluble Delta and inhibited by the anti-Notch 4 antibody, then it is used in these assays. The cells are stably transfected with a luciferase minigene under the control of the Notch-inducible HET-1 promoter.
- the cells are plated at single cell density to prevent cell-cell Notch-Notch ligand interactions. They are treated with the various combinations of Notch ligands and either the anti-Notch 4 antibody or a control antibody.
- the cells are harvested and a luciferase assay is done to determine how each condition affects Notch signal transduction as reflected by transactivation of the HET1 promoter.
- a comprehensive functional analysis of candidate genes that emerge from the microarray analysis can be performed. Full-length cDNAs are isolated and cloned into a retroviral expression vector.
- breast cancer cell lines and breast cancer stem cells isolated from the five xenograft tumors are infected in vitro and the effect of the retroviral transgene on self-renewal and tumorigenicity is assayed relative to clones infected with a control vector.
- the transgene is expressed as a bicistranic message that contains IRES-GFP. This allows identification of transduced cells via FACS or fluorescent microscopy.
- the effect of the transgene on Notch signaling is examined in vitro and in vivo. To do this, transduced cells are tested for response to the various combinations of Notch ligands found to affect colony formation in tissue culture and tumorigenicity in mice.
- microarray analysis provides unparalleled power to screen for changes in gene expression patterns. Combined with the ability to purify stem cells and to regulate their self-renewal and differentiation in vitro, microarray analyses can be applied with great precision to screen for specific types of regulatory genes.
- the anti-Notch 4 antibody retarded tumor formation after a single, brief incubation with cells.
- one thousand, ten thousand, and one hundred thousand tumorigenic cells from each of the five xenograft tumors are incubated with either a control antibody or the anti-Notch 4 antibody alone, or with various combinations of Delta, Jagged and Fringe family proteins.
- Each group is then mixed in Matrigel® containing the same antibody or Notch ligands and injected into mice.
- the effects of the anti-Notch 4 antibody on the number of cells and time needed to form a tumor are measured. The results are correlated with the microarray expression data, obtained in EXAMPLE 14.
- the following human sources of material are obtained for use in the methods of diagnosis of the invention: (1) primary tumors from patients with breast cancer and (2) pleural fluid from patients with metastatic breast cancer. A portion of the tumor or the pleural fluid is obtained during routine treatment when the patient's physician deems removal of the tumor or pleural fluid to be clinically indicated.
- mice undergo euthanasia prior to development of illness If the mice do show evidence of discomfort from tumors (posture, appetite, or behavior changes, weight loss), they can be immediately sacrificed. Should the mice show evidence of more than mild discomfort (posture, appetite, or behavior changes) they are given analgesics such as oral morphine or codeine. Mice have bone marrow cells inoculated into their retro-orbital vein while anaesthetized with either ether or a similar general anesthetic agent.
- FIG. 19 A The cell cycle status of the breast cancer stem cell (FIG. 19 A) and non-tumorigenic populations of cells (FIG. 19B) in the tumor was determined by flow cytometry. There was a similar distribution of cells in the GI, S, and G2/M phases of the cell cycle in both populations. Thus, both the tumorigenic and non-tumorigenic populations exhibited similar cell-cycle distributions.
- This EXAMPLE rules out the possibility that all cells that expressed the solid tumor stem cell markers were at a particular stage of the cell cycle in the tumor that was analyzed. By selecting cells at a particular stage of the cell-cycle by flow-cytometric sorting of Hoechst stained tumor stem cells it may be possible to further enrich tumorigenic activity, just as it has been possible to enrich hematopoietic stem cell activity by selecting cells with low levels of Hoechst staining
- ES A + CD44 + CD24 " lo LINEAGE " cells breast cancer stem cells
- non-tumorigenic cells obtained from one of the xenograft tumors with Rhodamine 123.
- This EXAMPLE shows tumor cell heterogeneity and indicates that MDR pump activity may be higher in a solid tumor cells.
- This distinct cell population phenotypically resembles the breast cancer stem cell and may represent an ovarian cancer stem cell.
- sarcoma cells include a CD44+ population that phenotypically resembles breast cancer stem cells and that may represent sarcoma stem cells.
- RNA extracted from the cells or complementary DNA (cDNA) made from the extracted RNA can be RNA extracted from the cells or complementary DNA (cDNA) made from the extracted RNA.
- cDNA complementary DNA
- labeled cDNA is useful. In one embodiment, we use the methods of single round RT labeling from total RNA source.
- RNA preparations that look good by the standard molecular biology criteria can give poor results.
- Typical problems include disperse, fine-grain noise over the entire hybridized surface and non-specific binding of fluor to the zones of DNA immobilization on the slide. These problems seem likely to have some roots in contaminating carbohydrate, and as would be expected with carbohydrate, the problems are exacerbated by ethanol precipitations before and after labeling. Very impure preparations frequently produce visible aggregates if precipitated after labeling and ethanol precipitation, which are essentially resistant to solubilization.
- nucleic acids form strong aggregates with carbohydrate when either dried together or when co-precipitated. This interaction is the basis for nucleic acid "immobilization onto chromatography supports such as cellulose. To minimize this sort of problem, we recommend " preparative procedures which use few or preferably no ethanol precipitations during RNA preparation and labeling. We use at least the volumes of extractant and washing solutions suggested for" the number of cells being processed. Appropriate or slightly excessive extraction/wash volumes tend to minimize noise in a hybridization assay. [322] Methods that give satisfactory results are Triazol extraction (BRL) and Rneasy (Quiagen).
- RNA is prepared from tissue (from solid tumor or xenograft tumor), tissue culture or enriched populations of solid tumor stem cells obtained by flow cytometry .
- tissue from solid tumor or xenograft tumor
- tissue culture or enriched populations of solid tumor stem cells obtained by flow cytometry .
- A260 A260
- 50 mM NaOH 50 mM NaOH.
- Fluorescent Nucleotides are from Amersham Life Sciences or Perkin Elmer Applied
- Cy 3 and Cy 5 nucleotides come at concentration of 1 mM.
- the Rl 10 nucleotide comes at concentration of 0.1 mM, and must be dried and resuspended at 0.1 x the initial volume to bring it to 1 mM.
- the factors of labeling efficiency, fluorescent yield, spectral separation, and tendency toward non-specific binding make the Cy3/Cy5 pair the most useful for the detection system.
- the primer can be Pharmacia oligo (dT) 12-18 (27-7858-01).
- Unlabeled nucleotide mixes are prepared from Pharmacia 100 mM stocks.
- the reverse transriptase is BRL Superscript II (18064-014).
- the 5X buffer is the buffer supplied with the polymerase.
- NTP Fluor nucleotide
- the Cy5 probe may produce a gelatinous blue precipitate which is recovered in the concentrated volume. The presence of this material signals the presence of contaminants. The more extreme the contamination, the greater the fraction of probe which will be captured in this gel. Even if heat solubilized, this material tends to produce uniform, nonspecific binding to the DNA targets.
- the blocking species is poly(dA) from Pharmacia (27-7988-01) (resuspended at 8 mg/ml); yeast tRNA from Sigma (R8759) (resuspended at 4 mg/ml); and CoTl DNA from Life Technologies Inc. (concentrateed 10 fold to 10 mg/ml).
- the volume required for the hybridization is dependent on the size of array used. For hybridizations that require small volumes (20-25 ⁇ l), the probe volumes after microcon concentration can be too large. If so, then we add the blockers to the Cy3 probe and precipitate the Cy3 probe.
Abstract
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US11/529,869 US7850961B2 (en) | 2000-08-03 | 2006-09-29 | Methods for targeting solid tumor stem cells in a solid tumor using a notch4 receptor antagonist |
US11/607,780 US7754206B2 (en) | 2000-08-03 | 2006-12-01 | Method for treating cancer using a Notch4 ligand antagonist |
US11/651,214 US20090004205A1 (en) | 2000-08-03 | 2007-01-09 | Prospective identification and characterization of breast cancer stem cells |
US11/788,489 US20080194022A1 (en) | 2000-08-03 | 2007-04-20 | Isolation and use of solid tumor stem cells |
US11/776,935 US8044259B2 (en) | 2000-08-03 | 2007-07-12 | Determining the capability of a test compound to affect solid tumor stem cells |
US12/758,540 US20110033481A1 (en) | 2000-08-03 | 2010-04-12 | Prospective identification and characterization of breast cancer stem cells |
US12/979,991 US8357491B2 (en) | 2000-08-03 | 2010-12-28 | Isolation and use of solid tumor stem cells |
US13/241,701 US8420885B2 (en) | 2000-08-03 | 2011-09-23 | Determining the capability of a test compound to affect solid tumor stem cells |
US13/563,884 US20120295350A1 (en) | 2000-08-03 | 2012-08-01 | Prospective Identification and Characterization of Breast Cancer Stem Cells |
US13/714,921 US20140011274A1 (en) | 2000-08-03 | 2012-12-14 | Isolation and use of solid tumor stem cells |
US13/795,381 US9089556B2 (en) | 2000-08-03 | 2013-03-12 | Method for treating cancer using an antibody that inhibits notch4 signaling |
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WO2004097008A1 (en) * | 2003-05-02 | 2004-11-11 | Cytovation As | Method of generating and isolating tumour cells |
EP1499180A2 (en) * | 2002-04-16 | 2005-01-26 | Dana-Farber Cancer Institute, Inc. | Cancer models |
WO2006047878A1 (en) * | 2004-11-03 | 2006-05-11 | British Columbia Cancer Agency Branch | Cancer therapeutics and methods for their use |
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