WO1992016558A1 - Cell surface receptors homologous to coagulation factors v and viii - Google Patents
Cell surface receptors homologous to coagulation factors v and viii Download PDFInfo
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- WO1992016558A1 WO1992016558A1 PCT/US1992/002109 US9202109W WO9216558A1 WO 1992016558 A1 WO1992016558 A1 WO 1992016558A1 US 9202109 W US9202109 W US 9202109W WO 9216558 A1 WO9216558 A1 WO 9216558A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/575—Hormones
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/745—Blood coagulation or fibrinolysis factors
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
Definitions
- the present invention relates to a new class of extracellular receptor molecules homologous to human coagulation factors V and VIII, and activated forms thereof. Amino acid residue sequences of the receptors are described, as are antibodies immunoreactive with the receptor molecules and associated diagnostic kits.
- proteolytic activities on cellular surfaces initiates a variety of essential biologic responses.
- Specific high affinity receptors coordinate such interactions, protect the protease from inactivation by ubiquitous extracellular inhibitors, and provide optimal spatial alignment for the catalytic efficiency of the enzyme.
- the regulated association of coagulation and fibrinolytic proteins with a variety of cells may well exemplify these mechanisms of specialized protease-cell interactions [Miles, L. A., et al., Fibrinolvsis. 2:61 (1988); Morrissey, et al.. Cell, 50:129 (1987); Nesheim, M. E., et al., J. Biol. Chem.. 254:10952 (1979)].
- the present invention relates to a new class of cellular receptor molecules.
- the receptor molecules are homologous with certain coagulation cofactors, such as human coagulation factors V and VIII. Functionally, the receptor molecules bind serine protease ligands, such as the circulating proteins factor Xa, factor IX/IXa and plasmin(ogen) .
- a preferred receptor molecule referred to herein as EPR-1, is homologous to but different from human factor V and binds factor Xa. Polypeptides containing an amino acid residue sequence homologous to EPR-1 are also contemplated.
- a preferred embodiment of the invention is a purified protein that has a molecular weight of about 78 kDa and an amino acid residue sequence comprising the following amino acid residue sequences:
- Xaa is an unspecified amino acid, which can be in the protein as any naturally-occurring amino acid residue, including a modified or unusual, e.g., glycosylated, residue.
- the Xaa residue can be identical to or other than another Xaa residue in the molecule.
- the protein immunoreacts with the antibody produced by the hybridoma designated 12H1 (ATCC Accession No. HB 10637) .
- the protein is the EPR-1 protein isolated from the cell line designated M0LT13 ⁇ 3 (ATCC Accession No. CRL 10638) .
- Another preferred embodiment of the invention is a poiypeptide comprising up to about 600 amino acid residues which includes an amino acid residue sequence selected from the group of sequences (l)-(7) listed above.
- DNA segment that codes for a protein or polypeptide as defined previously and a vector, i.e., self- replicating DNA molecule, including the DNA segment.
- an antibody composition which immunoreacts with an instant protein or polypeptide.
- a particularly preferred antibody composition is the monoclonal antibody produced by the 12H1 hybridoma.
- Another preferred antibody composition immunoreacts with a protein isolated from the MOLT13 #3 cell line, which has a molecular weight of about 78 kDa, and includes a before-listed amino acid residue sequence.
- a method of assaying for the presence of an instant receptor molecule on a cell surface is also contemplated. The method comprises the steps of:
- the method comprises assaying for the marker using an antibody composition described before, repeating the assay after a course of treatment, and determining the patient's response to treatment as a function of the amount of that cell surface protein present after treatment.
- An exemplary disease state monitored is chronic lymphocytic leukemia (CLL) .
- FIG. 1 depicts FMF (flow microfluorometry) analysis of monocytes or PMN (polymorphonuclear leucocytes) with anti-EPR-1 mAb 9D4.
- PBMC peripheral blood mononuclear cells
- PMN peripheral blood mononuclear cells
- the 1 x 10 6 cells were stained with 10 ⁇ g/ml of mAb 9D4 for 30 minutes in ice, washed, and further incubated with 1/20 dilutions of fluorescein-conjugated goat anti-mouse IgG. Cells were washed and immediately analyzed by FMF.
- Control mAb was the irrelevant V82A6 and is shown with a dotted line.
- the abscissa indicates fluorescence intensity on a 4 log scale.
- the ordinate indicates the cell number.
- Figure 2 depicts modulation of EPR-1 expression during T cell activation.
- Aliquots of freshly isolated PBMC (10 x 10 6 ) were polyclonally activated by culture in the presence of 1 ⁇ g/ml PHA or Con A for 7 days at 37°C.
- suspensions of PBMC at 10 x 10 6 were separately cultivated in unidirectional mixed lymphocyte culture (MLC) with irradiated (10,000 rad) Daudi or Raji cells (10 x 10 6 ) for 7 days in 5% C0 2 at 37°C.
- MLC unidirectional mixed lymphocyte culture
- responder T cells were harvested, recovered by centrifugation over Ficoll-Hypaque, washed, stained with aliquots of mAb 12H1 plus fluorescein-conjugated goat anti-mouse IgG + IgM, and analyzed by FMF.
- the dotted line indicates the background staining with the irrelevant mAb V82A6.
- the percentage of 12H1 + cells analyzed before each incubation mixture was 6.7 ⁇ 1.4%.
- Figure 3 depicts the effects of long term alloreactive stimulation on EPR-1 expression. Unidirectional MLC was set up against irradiated
- T-cell growth factor (TCGF)
- Figure 4 depicts expression of EPR-1 on transformed T cell lines, FMF analysis of a panel of continuous T cell lines in culture with anti-EPR-1 mAb
- the irrelevant mAb V82A6 was used as a control, and is shown as a dotted line.
- Amino Acid Residue Sequence a series of two or more amino acid residues joined via peptide linkages between adjacent residues to form a peptide or polypeptide.
- An amino acid residue sequence is conveniently represented by the one or three letter abbreviations for its constituent amino acids.
- the abbreviations used herein for amino acids are those provided at 37 C.F.R. ⁇ 1.822(b) (2) and are reproduced in the following Table of Correspondence:
- amino acid residue sequence herein may be in the D or L isomeric form as long as the desired functional property is retained by molecule(s) incorporating the amino acid residue sequence.
- amino acid residue sequence may include post-translationally modified amino acids, e.g. , hydroxylated, glycosylated amino acid residues, or residues linked via disulfide bonds.
- an amino acid residue sequence can include one or more modified or unusual amino acids, such as those listed in 37 C.F.R. ⁇ 1.822(b) (4) , which are incorporated herein by reference.
- An amino acid residue sequence can be represented by the abbreviations corresponding to its constituent amino acids in which a hyphen between two adjacent abbreviations indicates a peptide linkage between the corresponding residues.
- Antibody a polypeptide which chemically binds to a haptenic group, i.e., ligand.
- Antibodies, as used herein, are immunoglobulin molecules and immunologically active fragments of immunoglobulin molecules. Such portions known in the art as Fab, Fab'; F(ab') 2 and F v are included.
- antibodies bind ligands that range in size from about 6 to about 34 A with association constants in the range of about 10* to 10 10 M "1 , and as high as 10 13 M "1 .
- Antibodies can bind a wide range of ligands, including small molecules such as steroids and prostaglandins, biopolymers such as nucleic acids, proteins and polysaccharides, and synthetic polymers such as polypropylene.
- An "antibody combining site” is that structural portion of an antibody molecule comprised of a heavy and light chain variable and hypervariable regions that specifically binds (immunoreacts with) antigen.
- the term "immunoreact” in its various forms is used herein to refer to binding between an antigenic determinant-containing molecule (antigen) and a molecule containing an antibody combining site such as a whole antibody molecule or a portion thereof.
- an “antigenic determinant” is the structural portion of the antigen that is immunologically bound by an antibody combining site.
- the term is also used interchangeably with “epitope”.
- Antibodies can bind a single epitope of an antigen (monoclonal) or multiple epitopes (polyclonal) .
- Ligand a molecule having a structural region that binds specifically to a particular receptor molecule, usually via electrostatic forces and/or hydrogen bonds.
- Peptide/Polypeptide a polymer comprising at least two amino acid residues in which adjacent residues are connected by a peptide bond between the alpha-amino group of one residue and the alpha- carbonyl group of an adjacent residue.
- the primary structure of a polypeptide has a primary amine group at one terminus and a carboxylic acid group at the other terminus of the polymer.
- a polypeptide may be represented by the formula:
- R is a side chain characteristic of a given amino acid residue and i indicates the number of amino acid residues comprising the polymer which number is two or more.
- a polypeptide can comprise one or more amino acid residue sequences.
- a polypeptide in aqueous solution is usually in one or more zwitterionic forms depending on the pH of the solution.
- Protein a single polypeptide or set of cross- linked polypeptides comprising more than about 50 amino acid residues. Proteins can have chemical crosslinking, i.e., via disulfide bridges, within the same polypeptide chain or between adjacent polypeptides. Proteins can be glycosylated in which case they are called glycoproteins.
- Receptor a biologically active proteinaceous molecule having a structural region that specifically binds to (or with) another molecule (ligand) .
- a polypeptide of the present invention is derived from a new class of cell surface receptors, called effector cell protease receptors (EPRs) because members of the class bind protease ligands and are also found on many types of inflammatory effector cells.
- EPR-1 effector cell protease receptors
- the first member of this class (EPR-1) is shown to bind protease ligands of which human factor Xa is prototypic.
- a polypeptide of the present invention corresponds in amino acid residue sequence to one or more amino acid residue sequence of EPR-1. Moreover, a polypeptide of the invention is shown to have pronounced homologies with the amino acid residue sequence of human coagulation factor V, suggesting a common evolutionary origin of factor V and EPR-1. As factor V includes the residue sequence of factor Va, an instant polypeptide also can have homologies with factor Va. A polypeptide of the invention also can exhibit homology in sequence to a polypeptide portion of factor VIII, as well as to a polypeptide of the murine protein denominated MFG E-8 [Stubbs et al. , Proc Natl Acad Sci USA 87:8417 (1990)]. A polypeptide of this invention is nonetheless distinct from factor V, factor VIII or murine MFG E-8.
- the polypeptide is a protein having a molecular weight of about 78 kDa which includes the following amino acid residue sequences:
- Xaa is present in the molecule as an unspecified amino acid residue.
- the Xaa residue can be any naturally-occurring amino acid residue including a modified or unusual residue (cf. 37 C.F.R. ⁇ 1.822(b) (4)) .
- the Xaa residue need not be the same as another Xaa residue in a particular amino acid residue sequence or in another sequence of the molecule having an Xaa residue.
- the protein has a molecular weight of 78 ⁇ 4 kDa, as determined by polyacrylamide gel electrophoresis. (The number associated with each amino acid residue sequence refers to its Sequence I.D. No. as presented in the sequence listing provided herewith pursuant to the requirements of 37 C.F.R. ⁇ 1.821(c)).
- the protein is isolated from the cell line designated M0LT13 #3 and has a molecular weight of about 78 kDa.
- the M0LT13 #3 cell line was deposited at the American Type Culture Collection (ATCC) 12301 Parklawn Drive, Rockville, Maryland, USA 20852. This cell line was deposited on January 11, 1991 and received Accession Number CRL 10638.
- the protein is immunoreactive with certain antisera to human factor V as well as with polyclonal antibodies purified from the antisera, e.g., by immunoadsorption on immobilized, purified human factor V.
- the protein immunoreacts with antibodies to human factor VIII.
- the instant EPR protein is not a human factor V or VIII protein per se. it possesses epitopes that are cross- reactive with ligands for certain epitopes of factors V and VIII.
- the isolated protein immunoreacts with a small set of antibodies such as those produced by the hybridoma designated 12H1, which was deposited on
- the hybridoma was given the designation ATCC HB 10637.
- polypeptide of this invention has an amino acid residue sequence represented by the following formula:
- the polypeptide comprises up to about 600 amino acid residues.
- X hemp or X. when either X grip or X. is an amino acid residue sequence, X hemp or X., contains up to about 200 residues, more preferably, up to about 50 residues, and most preferably, up to about 20 amino acid residues. Typically, X_. and X ⁇ each contain one or more of the before-listed amino acid residue sequences.
- X n and X- n are selected so that the polypeptide immunoreacts with sera containing antibodies raised to human factor V. More preferably, X n and X,, are selected so that the polypeptide is a protein having a molecular weight of about 78 kDa. Most preferably, the isolated protein also binds to human factor Xa.
- a polypeptide of the invention has the formula:
- a polypeptide of the present invention can be used to generate a variety of useful antibodies by means described herein.
- the utilities of the polypeptides will be apparent from the discussion provided hereinbelow.
- an instant polypeptide is not glycosylated, i.e., it is synthesized either directly by standard peptide synthesis techniques or by procaryotic host expression of a recombinant DNA molecule of the present invention.
- a eucaryotically produced polypeptide of the present invention is typically glycosylated.
- an instant polypeptide can incorporate a variety of changes, such as insertions, deletions, and substitutions of amino acid residues which are either conservative or nonconservative as long as the resulting polypeptide molecule exhibits the desired properties.
- the "desired properties" as referred to herein include that the polypeptide is immunogenic in a suitable host and able to generate antibodies to the EPR-1 molecule or a polypeptide homologous to EPR-1, at least in the denatured state as is found in an SDS- PAGE gel, but frequently also in the natural state as expressed on cells. Additionally, the polypeptide is antigenic when expressed on cells or in its denatured state so that antibodies immunoreactive with the EPR-1 molecule also immunoreact with the instant polypeptide.
- the substituted amino acid residues are replaced by another, biologically similar amino acid residue such that the resulting polypeptide has an amino acid residue sequence that is different from (other than) a sequence of factor V, factor VIII or sequence MFG E-8.
- conservative substitutions include substitution of a hydrophobic residue such as isoleucine, valine, leucine or methionine for another hydrophobic residue.
- a polar residue such as arginine, glycine, glutamic acid, aspartic acid, glutamine, asparagine, and the like, can be conservatively substituted for another member of this group.
- polypeptide incorporating conservative substitutions occurs when a substituted amino acid residue replaces an unsubstituted parent amino acid residue.
- substituted amino acids may be found at 37 C.F.R. ⁇ 1.822(b) (4) , which species are incorporated herein by reference.
- the polypeptide has an amino acid residue sequence that corresponds to the sequence of EPR-1 but has one or more conservative substitutions, preferably no more than about 40%, and more preferably no more than about 20%, of the amino acid residues of the native protein are substituted.
- a polypeptide of the present invention can be synthesized by any of the peptide synthetic techniques known to those skilled in the art. A summary of some of the techniques available can be found in J.M. Stuard and J. D. Young, "Solid Phase Peptide
- An instant polypeptide can also be synthesized by recombinant DNA techniques. Such recombinant techniques are favored especially when the desired polypeptide is relatively long (greater than about 50 amino acids residues in length) .
- recombinant DNA techniques are employed to prepare an instant polypeptide, a DNA segment coding for the desired polypeptide is incorporated into a preselected vector that is subsequently expressed in a suitable host.
- the expressed polypeptide containing at least one of amino acid residue sequences (l)-(7) corresponding to EPR-1 identified above, is preferably purified by a routine method such as gel electrophoresis, immunosorbent chromatography, and the like.
- a DNA segment encoding the polypeptide is used.
- a DNA segment contemplated within the invention is operatively linked to a vector that is subsequently expressed in a suitable host.
- the segment is "operatively linked" to the vector as used herein when it is ligated (covalently bonded) thereto, as is well known.
- an RNA segment equivalent to an instant DNA segment is also contemplated.
- the present DNA segment is a molecule that can be readily synthesized by chemical techniques, e.g., by the well-known phosphotriester method [Matteuci et al., JACS. 103:3185 (1981)].
- chemically synthesizing the DNA segments any desired substitution, insertion or deletion of an amino acid residue or sequence from a template polypeptide, e.g., the native protein, can be readily provided by simply making the corresponding changes in the nudeotide sequence of the DNA segment.
- RNA segment coding for the instant polypeptide is used, the RNA molecule including the polypeptide coding segment is transcribed into complementary DNA (cDNA) via a reverse transcriptase.
- the cDNA molecule can then be transcribed and translated as described herein to generate a desired polypeptide.
- a DNA nudeotide sequence (segment) coding for at least one of the amino acid residue sequences (l)-(7) of EPR-1 identified above is operatively linked to a larger DNA molecule.
- the resultant DNA molecule is then transformed in a suitable host and expressed therein.
- the DNA segment coding for an amino acid residue sequence (l)-(7) listed above can be provided with start and stop codons or one or both of the start and stop codons can be provided by the larger DNA molecule, e.g. , vector, operatively linked to the DNA segment so that only the corresponding polypeptide is generated.
- a nudeotide sequence coding for additional amino acid residues can be provided at the 3' and/or 5' ends of the DNA segment so that a larger polypeptide is expressed having an amino acid residue sequence at either or both of its N-terminal and C-terminal ends in addition to an amino acid residue sequence (l)-(7) listed above of the EPR- 1 molecule.
- a DNA molecule of the invention can encode a polypeptide having an amino acid residue sequence represented by the formula:
- the DNA segment encodes a polypeptide up to about 600 amino acid residues in length.
- the DNA segment encodes a polypeptide having either X.. or X,,, as an amino acid residue sequence, X propel or X, contains up to about 200 residues, more preferably up to about 50 residues, and most preferably, up to about 20 amino acid residues.
- one or both of the flanking regions to the DNA segment encoding the Y sequence of the polypeptide encodes one or more of the amino acid residue sequences (l)-(7) listed above.
- An instant DNA molecule can also be produced by enzymatic techniques.
- restriction enzymes which cleave DNA molecules at predefined recognition sequences can be used to isolate DNA fragments from larger DNA molecules containing the desired DNA segments such as the DNA (or RNA) that codes for the EPR-1 protein.
- DNA fragments produced in this manner will have cohesive, "overhanging" termini, in which single-stranded nudeotide sequences extend beyond the double-stranded portion of the molecule. The presence of such cohesive termini is generally preferred over blunt-ended DNA molecules.
- the isolated fragments containing the desired coding sequence can then be ligated (cloned) into a suitable vector for amplification and expression.
- an instant DNA segment can be generated by polymerase chain reaction (PCR) techniques, which amplify targeted DNA segments of a template nucleic acid.
- PCR polymerase chain reaction
- a specific polynucleic acid target is transcribed by a reaction in which a primer molecule complementary to a particular section of a nucleic acid template is used to form an extension product of the primer including a nucleic acid region complementary to the target.
- each primer extension product acts as a template and specifically anneals with a complementary primer molecule.
- the resulting primed template acts as a substrate for further extension reactions.
- a DNA primer molecule coding for one or more of the before- enumerated amino acid residue sequences (l)-(7) is preferably utilized.
- additional nudeotide sequences can be revealed by cloning the cDNA or genomic DNA encoding EPR-1 and smaller amino acid residue sequences thereof.
- a DNA probe molecule encoding an EPR-1 amino acid residue sequence having minimal homology to either of factors V or VIII is usually employed in order to maximize specificity of hybridization with DNA or RNA encoding the targeted EPR-1 amino acid residue sequence and to minimize hybridization with DNA or RNA coding for either factor V, factor VIII, or homologous, nontargeted molecules.
- Vectors Also contemplated within the present invention is a vector that can be operatively linked to an instant DNA segment to provide a self-replicating recombinant DNA molecule that encodes an instant polypeptide, preferably expressing the EPR-1 protein itself.
- the recombinant molecule can be used to transform suitable host cells so that the host cells express the desired polypeptide.
- the DNA molecule can be regarded as self-replicating.
- a vector of the present invention is at least capable of directing the replication, and preferably also expression, of a DNA segment coding for an instant polypeptide.
- a chosen vector includes a procaryotic replicon, i.e., a DNA sequence, having the ability to direct autonomous replication and maintenance of the recombinant DNA molecule extrachromosomally in a procaryotic host cell transformed therewith.
- a procaryotic replicon i.e., a DNA sequence
- a vector that includes a procaryotic replicon preferably also includes a drug resistance gene so that hosts transformed with a vector can be readily screened. Typical bacterial drug resistance genes are those that confer resistance to ampicillin or tetracycline.
- Vectors that include a procaryotic replicon preferably include a procaryotic promoter capable of directing the transcription of the instant polypeptide genes.
- a promoter is an expression control element formed by a DNA sequence that promotes binding of RNA polymerase and transcription of single-stranded DNA into messenger RNA (mRNA) molecules.
- Promoter sequences compatible with bacterial hosts, such as a tac promoter, are typically provided in plasmid vectors having convenient restriction sites for insertion of a DNA segment of the present invention.
- vector plasmids Typical of such vector plasmids are pUC8, pUC9, pBR322 and pBR329 available from Biorad Laboratories, (Richmond, CA) and pPL and pKK223 available from Pharmacia (Piscataway, NJ) .
- Expression vectors compatible with eucaryotic cells preferably those compatible with vertebrate cells, can also be used to form a recombinant DNA molecule described before.
- Eucaryotic cell expression vectors are well known in the art and are available from several commercial sources. Typically, such vectors are provided with convenient restriction sites for insertion of the desired DNA segment.
- Typical of such vectors are pSVL and pKSV-10 (Pharmacia) , pBPV- lpML2d (International Biotechnologies, Inc.), and pTDTl (ATCC, #31255) .
- a preferred drug resistance marker for use in vectors compatible with eucaryotic cells is the neomycin phosphotransferase (neo) gene. [Southern et al., J. Mol. Appl. Genet.. 1:327-341 (1982)].
- Retroviral expression vectors capable of generating the recombinant DNA of the present invention are also contemplated. The construction and use of retroviral vectors for generating desired DNA molecules have been described by Sorge, et al., Mol. Cell. Biol.. 4:1730-37 (1984).
- a number of methods are available to operatively link DNA to vectors via complementary cohesive termini. For instance, complementary homopolymer tracts can be added to the DNA segment to be inserted and to the vector DNA. The vector and DNA segment are then allowed to hybridize by hydrogen bonding between the complementary homopolymer tails to form recombinant duplex DNA molecules.
- synthetic linkers containing one or more restriction sites can be used to join the DNA segment to vectors.
- the DNA segment is generated by endonuclease restriction digestion, as described earlier, it is treated with bacteriophage T4 DNA polymerase of E. coli DNA polymerase I which removes protruding 3* single-stranded termini and fills in recessed 3' ends. Blunt-ended DNA segments are thereby generated.
- Blunt-ended DNA segments are incubated with a large molar excess of linker molecules in the presence of an enzyme that is able to catalyze the ligation of blunt-ended DNA molecules, such as bacteriophage T4 DNA ligase.
- an enzyme that is able to catalyze the ligation of blunt-ended DNA molecules, such as bacteriophage T4 DNA ligase.
- the products of the reaction are DNA segments bonded at their ends to linker sequences having restriction sites therein.
- the restriction sites of these DNA segments are then cleaved with the appropriate restriction enzyme and the segments ligated to an expression vector having termini compatible with those of the cleaved DNA segment.
- Synthetic linkers containing a variety of restriction endonuclease sites are commercially available from a number of sources including International Biotechnologies, Inc. (New Haven, CT) .
- the present invention also relates to host cells transformed with a recombinant DNA molecule of the present invention.
- the host cell can be either procaryotic or eucaryotic.
- Preferred procaryotic host cells are strains of E. coli. e.g., the E. coli strain DH5 available from Bethesda Research Laboratories,
- Preferred eucaryotic host cells include yeast and mammalian cells, preferably vertebrate cells such as those from mouse, rat, monkey or human fibroblastic cell line.
- Preferred eucaryotic host cells include Chinese hamster ovary (CHO) cells available from the ATCC as CCL61 and NIH Swiss mouse embryo cells NIH/3T3 available from the ATCC as CRL 1658. Transformation of appropriate cell hosts with a recombinant DNA molecule of the present invention is accomplished by well known methods that typically depend on the type of vector used. With regard to transformation of procaryotic host cells, see, for example, Maniatis et al.. Molecular Cloning. A Laboratory Manual.
- transformed cells i.e., those containing a recombinant DNA molecule of the present invention, can be identified by well known techniques. For example, transformed cells can be cloned to produce monoclonal colonies. Cells from those colonies can be harvested, lysed and their DNA content examined for the presence of the desired DNA segment using a method such as that described by Southern, J. Mol. Biol.. 98:503 (1975).
- nutrient media useful for culturing transformed host cells are well known in the art and can be obtained from several commercial sources.
- a "serum-free" medium is preferably used.
- Methods for recovering an expressed protein from a culture are well known in the art. For instance, gel filtration, gel chromatography, ultrafiltration, electrophoresis, ion exchange, affinity chromatography and related techniques can be used to isolate the expressed proteins found in the culture.
- immunochemical methods such as immunoaffinity, immunoadsorption, and the like, can be performed using well known methods, as exemplified by the methods described herein.
- Antibody Compositions Also contemplated within the present invention is an antibody composition that immunoreacts with an instant polypeptide.
- An antibody composition immunoreacts with the polypeptide either associated with cellular surfaces or free from cellular structures.
- an antibody composition binds to one or more epitopes presented by the polypeptide on the exterior surface of cells or to the epitopes of cell-free polypeptides.
- a preferred antibody composition of the invention immunoreacts with an EPR-1 protein molecule presented on the cell surface or free of cellular components as when the EPR-1 molecule is isolated upon lysis of cells carrying the molecule.
- Particularly preferred antibody compositions in this regard are the monoclonal antibodies (mAbs) designated 7G12, 9D4, and 12H1.
- mAbs are obtained as described herein and in Altieri et al., J. Biol. Chem.. 264(5) :2969 (1989) and Altieri et al., J. Immun. 145:246 (1990).
- polyclonal antibodies are also contemplated. Briefly, a preferred antibody composition is generated by immunizing mice with human factor V, factor VIII or a polypeptide of this invention. The antibodies generated are screened for binding affinity for a polypeptide of the instant invention, such as
- EPR-1 Isolated EPR-1 or EPR-1 on washed lymphocytes free of factor V or factor VIII can be used for screening the antibodies.
- the instant mAbs immunoreact both with factor V and with the target polypeptide of this invention having homology with factor V.
- the mAbs preferably immunoreact with the target polypeptide but not with the blood coagulation factor.
- the mAbs can also immunoreact with factor VIII proteins similar to the reaction with factor V.
- the antibodies of the present invention can bind to receptors for coagulation factor Xa, they can be used to competitively inhibit factor Xa from binding to sites on cellular surfaces.
- the protease activity of factor Xa in the region of the cell surfaces can be curtailed. Methods for inhibiting such binding are well known to those skilled in the art.
- a preferred antibody composition as contemplated herein is typically produced by immunizing a mammal with an inoculum containing human factor V or a polypeptide of the present invention, thereby inducing in the mammal antibody molecules having the appropriate immunospecificity for the immunogenic polypeptide.
- the antibody molecules are then collected from the mammal, screened and purified to the extent desired by well known techniques such as, for example, by immunoaffinity for the immunogen immobilized on a solid support.
- the antibody composition so produced can be used inter alia, in the diagnostic methods and systems of the present invention to detect expression of the instant polypeptides on the surface of cells, e.g., leukocytes of patients with chronic lymphocytic leukemia (CLL) .
- CLL chronic lymphocytic leukemia
- a monoclonal antibody composition is also contemplated by the present invention, as noted before.
- the phrase "monoclonal antibody composition" in its various grammatical forms refers to a population of antibody molecules that contain only one species of antibody combining site capable of immunoreacting with a particular antigen.
- the instant mAb composition thus typically displays a single binding affinity for any antigen with which it immunoreacts.
- a given monoclonal antibody composition may contain antibody molecules having two different antibody combining sites, each immunospecific for a different antigenic determinant, i.e., a bispecific monoclonal antibody.
- An instant mAb is typically composed of antibodies produced by clones of a single cell called a hybridoma that secretes (produces) but one kind of antibody molecule.
- the hybridoma cell is formed by fusing an antibody-producing cell and a myeloma or other self-perpetuating cell line.
- Such antibodies were first described by Kohler and Milstein, Nature 256:495-497 (1975).
- a particularly preferred hybridoma is designated 12H1 (ATCC Accession No. HB 10637) .
- a monoclonal antibody can also be produced by methods well known to those skilled in the art of producing chimeric antibodies. Those methods include isolating, manipulating, and expressing the nucleic acid that codes for all or part of an immunoglobulin variable region including both the portion of the variable region comprising the variable region of immunoglobulin light chain and the portion of the variable region comprising the variable region of immunoglobulin heavy chain. Methods for isolating, manipulating, and expressing the variable region coding nucleic acid in procaryotic and eucaryotic hosts are disclosed in Robinson et al., PCT Publication No. WO 89/0099; Winter et al., European Patent Publication No. 0239400; Reading, U.S. Patent No.
- nucleic acid codes for all or part of an immunoglobulin variable region that binds a preselected antigen (ligand) .
- Sources of such nucleic acid are well known to one skilled in the art and, for example, can be obtained from a hybridoma producing a monoclonal antibody that binds the preselected antigen, or the preselected antigen can be used to screen an expression library coding for a plurality of immunoglobulin variable regions, thus isolating the nucleic acid.
- the present invention contemplates a method of forming a monoclonal antibody molecule that immunoreacts with a polypeptide of the present invention, and optionally a factor V or VIII protein obtained from a mammal.
- the method comprises the steps of:
- the immunogen is a protein taken directly from a subject animal species.
- the antigen can also be linked to a carrier protein such as keyhole limpet hemocyanin, particularly when the antigen is small, such as a polypeptide consisting essentially of an amino acid residue sequence (l)-(7) listed above.
- the immunization is typically performed by administering the sample to an immunologically competent mammal in an immunologically effective amount, i.e., an amount sufficient to produce an immune response.
- the mammal is a rodent such as a rabbit, rat or mouse.
- a suspension of antibody-producing cells removed from the immunized mammal is then prepared. This is typically accomplished by removing the spleen of the mammal and mechanically separating the individual spleen cells in a physiologically tolerable medium using methods well known in the art.
- the suspended antibody-producing cells are treated with a transforming agent capable of producing a transformed ("immortalized") cell line.
- Transforming agents and their use to produce immortalized cell lines are well known in the art and include DNA viruses such as Epstein-Barr virus (EBV) , simian virus 40 (SV40) , polyoma virus and the like, RNA viruses such as Moloney murine leukemia virus (Mo- MuLV) , Rous sarcoma virus and the like, myeloma cells such as P3X63-Ag8.653, Sp2/0-Agl4 and the like.
- treatment with the transforming agent results in the production of an "immortalized" hybridoma by fusing the suspended spleen cells with mouse myeloma cells from a suitable cell line, e.g., SP-2, by the use of a suitable fusion promoter.
- the preferred ratio is about 5 spleen cells per myeloma cell in a suspension containing about 10 8 splenocytes.
- a preferred fusion promoter is polyethylene glycol having an average molecule weight from about 1000 to about 4000 (commercially available as PEG 1000, etc.); however, other fusion promoters known in the art may be employed.
- the cell line used should preferably be of the so-called "drug resistant" type, so that unfused myeloma cells will not survive in a selective medium, while hybrids will survive.
- the most common class is 8-azaguanine resistant cell lines, which lack the enzyme hypoxanthine-guanine phosphoribosyl transferase and hence will not be supported by HAT (hypoxanthine, aminopterin, and thymidine) medium. It is also generally preferred that the myeloma cell line used be of the so-called “non-secreting" type which does not itself produce any antibody.
- the transformed cells are then cloned, preferably to monoclonality.
- the cloning is preferably performed in a tissue culture medium that does not sustain (support) non-transformed cells.
- this is typically performed by diluting and culturing in separate containers the mixture of unfused spleen cells, unfused myeloma cells, and fused cells (hybridomas) in a selective medium which will not sustain the unfused myeloma cells.
- the cells are cultured in this medium for a time sufficient to allow death of the unfused cells (about one week) .
- the dilution can be a limiting dilution, in which the volume of diluent is statistically calculated to isolate a certain number of cells (e.g., 0.3-0.5) in each separate container (e.g., each well of a microtiter plate).
- the medium is one (e.g., HAT medium) that does not sustain the drug-resistant (e.g., 8-azaguanine resistant) unfused myeloma cell line.
- tissue culture medium of the cloned transformants is analyzed (immunologically assayed) to detect the presence of antibody molecules that preferentially react with the instant polypeptides or cells bearing the EPR-1 receptor molecule. This is accomplished using well known immunological techniques.
- a desired transformant is then selected and grown in an appropriate tissue culture medium for a suitable length of time, followed by recovery (harvesting) of the desired antibody from the culture supernatant by well known techniques.
- a suitable medium and length of culturing time are also well known or are readily determined.
- monoclonal antibodies to EPR-1 induced by immunization with factor V are relatively rare. Indeed, only about one percent of the monoclonal antibodies induced by the above method immunoreact with EPR-1.
- the desired hybridoma can be transferred by injection into mice, preferably syngenic or semisyngenic mice.
- the hybridoma causes formation of antibody-producing tumors after a suitable incubation time, which results in a high concentration of the desired antibody (about 5-20 mg/ml) in the bloodstream and peritoneal exudate (ascites) of the host mouse.
- DMEM Dulbecco's minimal essential medium
- a preferred inbred mouse strain is Balb/c.
- a further preferred method for forming the instant antibody compositions involves the generation of libraries of Fab molecules using the method of Huse et al.. Science, 246:1275 (1989).
- mRNA molecules for heavy and light antibody chains are isolated from the immunized animal.
- the mRNAs are amplified using polymerase chain reaction (PCR) techniques.
- PCR polymerase chain reaction
- the nucleic acids are then randomly cloned into lambda phages to generate a library of recombined phage particles.
- the phages are used to infect an expression host such as E. coli.
- the E. coli colonies and corresponding phage recombinants can then be screened for those producing the desired Fab fragments.
- Preferred lambda phage vectors are gtll and zap 2.
- the antibody molecule-containing composition employed in the present invention can take the form of a solution or suspension.
- the preparation of a composition that contains antibody molecules as active ingredients is well understood in the art.
- such compositions are prepared as liquid solutions or suspensions, however, solid forms suitable for solution in, or suspension in, liquid can also be prepared.
- the preparation can also be emulsified.
- the active therapeutic ingredient is often mixed with excipients which do not interfere with the assay and are compatible with the active ingredient.
- excipients are, for example, water, saline, dextrose, glycerol, ethanol, or the like and combinations thereof.
- the composition can contain minor amounts of auxiliary substances such as wetting or emulsifying agents, pH buffering agents and the like which enhance the effectiveness of the active ingredient.
- An antibody molecule composition can be formulated into a neutralized acceptable salt form.
- Acceptable salts include the acid addition salts (formed with the free amino groups of the antibody molecule) that are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, tartaric, mandelic, and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, 2-ethylamino ethanol, histidine, procaine, and the like.
- inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, tartaric, mandelic, and the like.
- Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, 2-
- the present invention contemplates a method for detecting an EPR-1 molecule, or polypeptide portion thereof.
- the assay can be for cell surface receptors homologous with EPR-1, including EPR-1 itself.
- the assay can be specific for EPR-1 itself by a proper selection of antibody specificity.
- an assay of the invention can be for polypeptide receptors homologous to portions of EPR-1 as well as "free", i.e., unassociated with any particular cell structure, polypeptides homologous to EPR-1, or polypeptide portions thereof.
- the assay methods involve detecting EPR-1 exposed on cell surfaces, e.g. , CLL cells.
- the relative binding affinity of a reagent molecule for its target species is conveniently determined as described herein using the method of flow microfluorimetry (FMF) .
- FMF flow microfluorimetry
- cells expressing the target antigen e.g., EPR-1
- FMF flow microfluorimetry
- the labelled antibodies are typically fluorescein isothiocyanate-conjugated (FITC) , although other well known fluorescent labels can be used.
- the method for detecting an antigenic polypeptide of the present invention preferably comprises formation of an immunoreaction product between the polypeptide and an anti-polypeptide antibody molecule, as disclosed herein.
- the antigen to be detected can be present in a vascular fluid sample or in a body tissue sample.
- the immunoreaction product is detected by methods well-known to those skilled in the art. Numerous clinical diagnostic chemistry procedures can be utilized to form the detectible immunocomplexes.
- a polypeptide ligand for an instant EPR-1 receptor or polypeptide can be used in the assay method.
- An exemplary ligand in this aspect of the invention is a labelled factor Xa enzyme.
- a preferred assay method of the present invention involves determining the presence of EPR-1 cell surface receptors.
- Various heterogeneous and homogeneous assay protocols can be employed, either competitive or non-competitive for detecting the presence and preferably amount of cell surface receptors in a body sample, preferably cell-containing sample.
- the receptor molecules are homologous with human coagulation factors V and VIII or substantial polypeptide portion thereof, so that some care is required in distinguishing an EPR-1 molecule or its polypeptide portion from factors V and VIII.
- a particularly preferred receptor for assay is EPR-1, as expressed on CLL cells.
- the method comprises admixing a body sample, preferably human, containing cells to be analyzed with a before-described antibody composition that immunoreacts with the receptor molecules.
- a body sample preferably human
- the cell sample is washed free of coagulation factors V and VIII prior to the admixing step.
- the immunoreaction admixture thus formed is maintained under biological assay conditions for a time period sufficient for any cells expressing the antigen to immunoreact with antibodies in the antibody composition to form an antibody-receptor immunocomplex.
- the immunoreaction product is then separated from any unreacted antibodies present in the admixture. The presence, and if desired, the amount of immunoreaction product formed is then determined.
- the amount of product formed can then be correlated with the amount of receptors expressed by the cells. Determination of the presence or amount of immunoreaction product formed depends upon the method selected for identifying the product.
- a labelled antibody can be used to form a labelled immunocomplex with a receptor molecule of the present invention.
- the labelled immunocomplex can be quantitated by methods appropriate for detecting the respective label, e.g., fluorescent, radioactive, biotin labels and the like as discussed hereinbelow.
- an unlabelled antibody can be used to form an unlabelled immunocomplex, which is subsequently detected by immunoreacting a labelled antibody recognizing the unlabelled antibody with the unlabelled immunocomplex. The immunocomplex thereby becomes labelled and can be detected as described above.
- Biological conditions used in the instant assays are those that maintain the biological activity of the antibody, EPR-1 cell surface molecule and polypeptide molecules of this invention. Those conditions include a temperature range of about 4°C to about 45°C, preferably about 37°C, at a pH value range of about 5 to about 9, preferably about 7, and an ionic strength varying from that of distilled water to that of about one molar sodium chloride, preferably about that of physiological saline. Methods for optimizing such conditions are well known in the art.
- a body sample to be analyzed is withdrawn from a patient and apportioned into aliquots. At least one aliquot is used for the determination of antigen expression using an antibody composition of the present invention. If desired, a second aliquot can be used for determining reactivity of a control antibody with the sample.
- the analysis can be performed concurrently but is usually performed sequentially.
- data obtained in the instant assays are recorded via a tangible medium, e.g. , computer storage or hard copy versions.
- the data can be automatically input and stored by standard analog/digital (A/D) instrumentation that is commercially available. Also, the data can be recalled and reported or displayed as desired for best presenting the instant correlations of data. Accordingly, instrumentation and software suitable for use with the present methods are contemplated as within the scope of the present invention.
- A/D analog/digital
- the antibody compositions and methods of the invention afford a method of monitoring treatment of patients afflicted with chronic lymphocytic leukemia (CLL) , and other diseases in which expression of receptors homologous to factors V and VIII is correlated with the disease state. For instance, it is found that the frequency of cells expressing an EPR-1 marker is inversely related to the response to treatment of patients suffering from CLL. Additionally, patients afflicted with hairy cell leukemia (HCL) of the EPR-1 + type express markers detected by an instant antibody composition, thereby permitting monitoring of treatment.
- CLL chronic lymphocytic leukemia
- HCL hairy cell leukemia
- a method of monitoring a patient's response to treatment in which a marker for the disease is detected.
- the method comprises admixing a body sample containing cells to be assayed for EPR-1 marker with an instant antibody composition according to an assay method described above.
- the admixture is maintained for a time period sufficient to form an immunoreaction product under predefined reaction conditions.
- the amount of immunoreaction product formed is correlated to an initial disease state.
- a diagnostic system in kit form of the present invention includes, in an amount sufficient for at least one assay, a composition containing antibody molecules or fragments thereof of the present invention, as a separately packaged reagent, and preferably with a label able to indicate the presence of an immunoreaction product. Instructions for use of the packaged reagent are also typically included. "Instructions for use” typically include a tangible expression describing the reagent concentration or at least one assay method parameter such as the relative amounts of reagent and sample to be admixed, maintenance time periods for reagent/sample admixtures, temperature, buffer conditions and the like. In one embodiment, a diagnostic system is contemplated for assaying for the presence of EPR-1 receptors expressed on cells in a cell-containing sample.
- kits that comprises a container for anti-EPR-1 antibodies that immunoreact with receptor molecules on cells in the cell sample.
- the kit also contains a labelled antibody probe that immunoreacts with the immunocomplex of the anti-EPR-1 antibody and the EPR-1 receptor.
- the label can be any of those commonly available, e.g., fluorescein, phycoerythrin, rhodamine, 125 I, and the like.
- Other exemplary labels include 1:L1 In, 99 Tc, 67 Ga, and 132 I and nonradioactive labels such as biotin and enzyme-linked antibodies.
- Any label or indicating means that can be linked to or incorporated in an antibody molecule is contemplated as part of an antibody or monoclonal antibody composition of the present invention.
- a contemplated label can also be used separately, and those atoms or molecules can be used alone or in conjunction with additional reagents.
- Such labels are themselves well-known in clinical diagnostic chemistry and constitute a part of this invention only insofar as they are utilized with otherwise novel methods and/or systems.
- the linking of labels to polypeptides and proteins is well known.
- antibody molecules produced by a hybridoma can be labelled by metabolic incorporation of radioisotope-containing amino acids provided as a component in the culture medium. See, for example, Galfre et al., Meth. Enzvmol.. 73:3-46 (1981).
- the techniques of protein conjugation or coupling through activated functional groups are particularly applicable. See, for example, Aurameas, et al., Scand. J. Immunol.. Vol. 8, Suppl. 7:7-23 (1978), Rodwell et al., Biotech.. 3:889-894 (1984), and U.S. Pat. No. 4,493,795.
- An instant diagnostic system can also include a specific binding agent.
- a "specific binding agent” is a chemical species capable of selectively binding a reagent species of the present invention but is not itself an antibody molecule of the present invention.
- Exemplary specific binding agents are antibody molecules, complement proteins or fragments thereof, protein A and the like that react with an antibody molecule of this invention when the antibody is present as part of the immunocomplex described above.
- the specific binding agent is labelled.
- the agent is typically used as an amplifying means or reagent.
- a labelled specific binding agent is capable of specifically binding the amplifying means when the amplifying means is bound to a complex containing one of the instant reagents.
- a diagnostic kit of the present invention can be used in an "ELISA" format to detect the presence or quantity of an EPR-1 polypeptide in a body sample or body fluid sample such as serum, plasma or urine or a detergent lysate of cells, e.g., a lOmM CHAPS lysate.
- ELISA refers to an enzyme-linked immunosorbent assay that employs an antibody or antigen bound to a solid phase and an enzyme-antigen or enzyme-antibody conjugate to detect and quantify the amount of antibody or antigen present in a sample.
- a description of the ELISA technique is found in Chapter 22 of the 4th Edition of Basic and Clinical Immunology by D.P.
- the antibody or antigen reagent component can be affixed to a solid matrix to form a solid support that is separately packaged in the subject diagnostic systems.
- the reagent is typically affixed to the solid matrix by adsorption from an aqueous medium, although other modes of affixation well known to those skilled in the art can be used.
- an instant anti-EPR-1 antibody can be affixed to a surface and used to assay a solution containing EPR-1 molecules or cells expressing EPR-1 receptors.
- EPR-1, polypeptide fragments thereof, and whole or partially lysed cells expressing EPR-1 can be affixed to the surface and used to screen a solution for antibody compositions that immunoreact with the affixed species.
- Useful solid matrix materials in this regard include the derivatized cross-linked dextran available under the trademark SEPHADEX from Pharmacia Fine Chemicals (Piscataway, NJ) , agarose in its derivatized and/or cross-linked form, polystyrene beads about 1 micron to about 5 millimeters in diameter available from Abbott Laboratories of North Chicago, IL, polyvinyl chloride, polystyrene, cross-linked polyacrylamide, nitrocellulose- or nylon-based webs such as sheets, strips or paddles, tubes, plates, the wells of a microtiter plate such as those made from polystyrene or polyvinylchloride, and the like.
- the reagent species, labelled specific binding agent or amplifying reagent of any diagnostic system described herein can be provided in solution, as a liquid dispersion or as a substantially dry powder, e.g., in lyophilized form.
- the indicating means is an enzyme
- the enzyme's substrate can also be provided in a separate package of a system.
- the reagents are packaged under an inert atmosphere.
- a solid support such as the before-described microtiter plate and one or more buffers can also be included as separately packaged elements in this diagnostic assay system.
- the diagnostic system is contained in a conventional package.
- packages include glass and plastic (e.g., polyethylene, polypropylene and polycarbonate) bottles, vials, plastic and plastic- foil laminated envelopes and the like.
- PMN polymorphonuclear leucocytes
- PBMC peripheral blood mononuclear cells
- Ficoll-Hypaque Sigma Chemical Co., St. Louis, MO
- Monocytes were isolated from PBMC by adherence to plastic petri dishes precoated with autologous serum for 1 hour at 37°C. Cells were suspended at 1 to 1.5 x 10 7 /ml in detectable endotoxin-free RPMI 1640 medium (Irvine Scientific, Santa Ana, CA) and 10% heat inactivated FCS (fetal calf serum; Gemini Bioproducts Inc., Calabasas, CA) , 2 mM L-glutamine (Irvine), 25 mM HEPES (Calbiochem Boehring Diagnostic, La Jolla, CA) , 100 ⁇ g/ml gentamicin (Geramycin, Schering Corp., Kenilworth, NJ) .
- the monocytic cell line THP-1 was maintained in continuous culture in the above media further supplemented with 10 ⁇ M 2-ME (Eastman Kodak, Rochester, NY) .
- the transformed human leukemic- lymphoma T cell lines HuT 78, MOLT 4, CCRF-CEM, CCRF- HSB-2, and the human B lymphoma cell lines Raji and Daudi were maintained in culture as recommended.
- the human leukemia-lymphoma T cell lines Jurkat, MLT, PEER, and MOLT 13 were the generous gift of Dr. D. P. Dialynas, Research Institute of Scripps Clinic, La Jolla, CA.
- PBMC peripheral blood mononuclear cells
- T-25 vented flasks Costar Corp., Cambridge, MA
- 20 x 10 6 irradiated (10,000 rad) Raji or Daudi cells were maintained in RPMI 1640, 10% FCS, 25 mM HEPES, 10 ⁇ M 2-ME (mixed lymphocyte culture (MLC) medium) in a 5% C0 2 humidified incubator for 7 days at 37°C.
- MLC mixed lymphocyte culture
- Responder cells were harvested, isolated by centrifugation on Ficoll-Hypaque at 400 x g for 18 minutes at 22°C, washed in complete MLC medium, then cultured in 24-well plates (Costar) at 2 x 10 5 /well in the presence of 2 x 10 6 irradiated Daudi or Raji cells.
- responder T cells were transferred every 6 days according to the protocol described above and recultured in MLC medium containing 10% T cell growth factor (Cellular Product Inc., Buffalo, NY).
- MLC medium containing 10% T cell growth factor (Cellular Product Inc., Buffalo, NY).
- suspensions of freshly isolated PBMC at 1 x 10 6 /ml were treated with 1 ⁇ g/ml Con A (Calbiochem) or 1 ⁇ g/ml PHA (Phytohemagglutinin; Calbiochem) for 7 days in 5% C0 2 at 37°C. Aliquots of cells from these cultures were harvested after various time intervals, washed, and analyzed by FMF (flow microfluorometry) .
- Purified Ig fractions of mAb 7G12 (IgG2a) , 9D4 (IgGl), and 12H1 (IgM) were prepared by chromatography on Affi-Gel MAPS II or hydroxylapatite columns (Bio-Rad, Richmond, CA) .
- Purified Ig fractions of anti-V rabbit polyclonal antiserum B78.9 were prepared by ammonium sulfate fractionation and chromatography on DEAE Sephadex. Immunopurified B78.9 antibodies were isolated from purified factor V immobilized on Affigel 15 (Biorad, Richmond, CA) according to the manufacturer's directions.
- Anti-CD16 mAb were Leu lib (Becton Dickinson, Mountain View, CA) B73.1 and 3G8, the kind gift of Dr. G. Trinchieri, the Wistar Institute, Philadelphia PA.
- Anti-CD56 mAb NKH-1 (Leu 19) was purchased from Coulter Immunology, Hialeah, FL.
- Anti-CDllb and anti- CD18 mAbs were OKM1 and 60.3, respectively.
- mAbs to CD57 (HNK-1), CD3 (0KT3) , CD4 (OKT4) , CD8 (OKT8) , CD2 (OKT11), HLA class I (W6/32) were acquired from ATCC.
- Anti- ⁇ / ⁇ T cell receptor (TCR) mAb WT31 was purchased from Becton Dickinson, anti- / ⁇ TCR mAb ⁇ l was kindly provided by Dr. M.B. Brenner, Harvard Medical School, Boston, MA.
- Binding Reactions The interaction of various mAb with different cell types was evaluated by FMF. Briefly, 1 x 10 6 cells were incubated in V- bottomed microtiter plates (Costar) with saturating concentrations of each mAb for 30 minutes at 4°C. After washes in MLC media, 1/20 dilution aliquots of fluorescein-conjugated goat (F(ab') 2 anti-mouse IgG + IgM (Tago Inc., Burlingame, CA) were added for an additional 30 minutes at 4°C. Cells were washed and immediately analyzed on a Becton Dickinson IV/40 FACS.
- HuT 78 cells HuT 78*, 34% of the unfractionated population
- HuT 78* 34% of the unfractionated population
- washed in complete MLC medium washed in complete MLC medium, and cloned by limiting dilution in 96-well around- bottomed plates (Costar) at 0.3, 1, 3 cells/well in HuT 78 conditioned medium supplemented with 20% FCS.
- proliferating cells of single cell clonal origin on the basis of Poisson distribution were subcloned, established, and further phenotypically characterized by FMF.
- Nonspecific binding was quantified in the presence of 50-fold molar excess of unlabelled factor Xa added at the start of the incubation reaction, and was subtracted from the total to yield net specific binding.
- aliquots of HuT 78* cells were preincubated with 50 ⁇ g/ml of mAb 9D4 for 30 minutes at room temperature before the addition of serial concentrations of 125 I-Xa.
- the iodinated lysate was cleared of nuclei and other cellular debris by centrifugation at 14,000 x g for 30 minutes at 4°C, and extensively preabsorbed with aliquots of goat anti-mouse IgG + IgM conjugated with sepharose CL4B (Calbiochem) . Aliquots of the 125 I-labelled PMN lysate were separately incubated with mAb 12H1 or 60.3 for 14 hours at 4 ⁇ C under agitation.
- the immune complexes were precipitated by the addition of goat anti-mouse IgG + IgM conjugated with sepharose CL4B for an additional 6 hours at 4°C, extensively washed in the above lysis buffer, and finally resuspended in 2% SDS sample buffer, pH 6.8, containing 50 mM 2-dithiothreitol as a reducing agent.
- the samples were immediately boiled for 5 minutes, clarified by centrifugation at 14,000 x g for 5 minutes and finally electrophoresed on 7.5% SDS polyacrylamide slab gels in 0.1% SDS.
- EPR-1 Molecule The isolation to homogeneity of the EPR-1 molecule required the identification and/or establishment of cell types that constitutively express high levels of this surface antigen. These studies were conducted primarily on peripheral blood polymorphonuclear leukocytes (PMN) and on a specifically selected T cell clonal derivative from the parental T cell line M0LT13 #3 [Altieri, et al., J Immun. 145:246 (1990)].
- PMN peripheral blood polymorphonuclear leukocytes
- T cell clonal derivative from the parental T cell line M0LT13 #3 [Altieri, et al., J Immun. 145:246 (1990)].
- the subline M0LT13 #3 was established by two sequential cycles of fluorescence sorting of the parental line MOLT 13 using the anti-EPR-1 mAb 12H1. Only MOLT 13 cells expressing the highest levels of reactivity with mAb 12H1 by fluorescence analysis were isolated, cloned by limiting dilutions at 1 or 3 cells/well, grown to confluency, and finally re- screened again by flow cytometry for reactivity with mAb 12H1 as well as with a panel of mAbs directed against various T cell-related markers. The subline M0LT13 #3, established as described above, expressed 7-10 fold higher levels of EPR-1 as compared with the parental line.
- M0LT13 #3 cells (ATCC Accession Number CRL 10638) were grown continuously in suspension at 37°C in T150 tissue culture flasks, 5% C0 2 . Cells were harvested, washed twice in ice cold phosphate buffered saline supplemented with 5 mM EDTA., pH 7.2, and lysed in lysis buffer for 1 hour at 4°C in continuous agitation.
- the composition of the lysis buffer was found to be critical in obtaining satisfactory recovery of the isolated EPR-1 molecule.
- the detergent used was 0.3% CHAPS (3-[(3-cholamidopropyl)-dimethyla monio]-1- propanesulfonate; Calbiochem) in the presence of ImM CaCl 2 and a cocktail of protease inhibitors, including PMSF (1 mM) , p-APMSF (amidinophenylmethyl sulfonyl fluoride; Calbiochem) (1 M) , PPACK (0.25 mg/ml) , soybean trypsin inhibitor (0.1 mg/ml), benzamidine (1 mM) , leupeptin (0.25.
- aprotinin 10,000 U/ml.
- the ratio between volume of lysis buffer and cell number subjected to lysis depends on the cell type selected for the analysis. For MOLT13 #3 cells, approximately 120 ml of lysis buffer were required to effectively solubilize 10 9 cells. Under the same conditions, 4xl0 9 PMN was effectively solubilized using 200 ml of EPR-1 lysis buffer. The solubilized cell extract was then cleared of nuclei and other insoluble material by centrifugation at 6,000 rpm for 30 minutes at 4°C, and stored at -70°C until ready to use.
- the EPR-1 molecule bound to mAb 12H1 was isolated by the addition of 2 ml aliquots (5 mg) of goat anti-mouse IgM covalently conjugated to Sepharose CL4B (solid phase immuno- absorbent) for an additional 6 hours at 4°C in agitation. At the end of that time period, the immunoprecipitate was washed five times in EPR-1 lysis buffer by centrifugation at 3,000 rpm for 20 minutes at 4°C.
- the pellets from various tubes were pooled, resuspended in 0.4 ml of nonreduced SDS sample buffer, pH 6.8, boiled for 5 minutes to separate the antigen from the antibody complex, and finally separated by electrophoresis on a 7.5% preparative SDS polyacrylamide gel, applying 25 mAmps/gel constant current. After electrophoretic migration, the gels were fixed in methanol, stained in 0.08% Coomassie blue, and destained overnight in 10% methanol and 5% acetic acid.
- This isolation procedure allowed visualization of a prominent 78 kDa band stained by Coomassie blue and a second specific component migrating with a 66-68 kDa molecular size and frequently appearing as a doublet of 66/68 kDa.
- the 66/68 kDa species are believed due to limited proteolysis or underglycosylation.
- the 78 kDa stained band was excised from the preparative gel using a razor blade, macerated in small fragments with a spatula, and mixed with a digestion buffer containing 20% glycerol, 0.1% bromophenol blue, 125 mM Tris-HCl, 1 mM EDTA, 0.1% SDS, pH 6.8.
- the macerated bands were loaded in 6 wells on a 15% SDS- polyacrylamide gel and each sample was overlaid with 40 ⁇ l of Endoproteinase G, sequencing grade (v8) at 100 ⁇ g/ml final concentration.
- the samples were prerun at 50 mAmps until they entered the separating gel, digested during a 30 minute incubation time, and the generated fragments were finally separated during the remaining electrophoretic run.
- the gels were quickly soaked in water after the migration, then in CAPS ([3- (cyclohexylamino)-propanesulfonic acid]; Calbiochem) transfer buffer containing 10 mM CAPS and 20% methanol, and finally assembled onto Immobilon membrane in a gel transfer apparatus. Protein transfer was carried out at 450 mAmps for hours at room temperature.
- the Immobilon membranes were then removed, soaked in water, stained for 30-60 minutes in Coomassie blue 50% methanol, rinsed in water and destained in 10% acetic acid and 40% methanol. This procedure permitted the direct identification of a number of heavily stained bands by internal cleavage of the 78 kDa band EPR-1 molecule, and subsequential electrophoretic separation of the corresponding fragments.
- LDPPLLTRY 2324 factor VIII (C2) (Preferred) 1 GVPlP
- EPR-1 Expression Correlates with Response to CLL Therapy.
- the reactivity of anti-EPR-1 mAbs with peripheral blood cells isolated from patients with hematopoietic malignancies was explored with flow cytometry. It was found that in 28 out of 37 CLL patients (75%) , the number of EPR-1 + cells was increased 5-6 fold thereby including most of the circulating population, as compared with normal controls (EPR-1 + cells in normal donors: 16.5 ⁇ 3.2%, n-12 versus EPR-1 + cells in CLL: 89.1 ⁇ 2.5%, n-28) .
- EPR-1 molecules expressed on CLL cells also showed a mean increase of 2.5 fold as compared with normal controls (mean fluorescence of EPR-1 + normal cells: 85.6 ⁇ 16.1 versus EPR-1 + CLL: 215.6 ⁇ 50.3). Roughly 98% of PMC cell were positive to this marker.
- Two-color flow cytometry studies confirmed that in CLL patients both CD5 and EPR-1 were simultaneously co-expressed in the same cell population.
- sequential analysis of a group of CLL patients carried out over a 4-month period showed that positive biologic response to the therapy was frequently associated with drastic reduction (67-90% reduction) in the number of EPR-1 + cells detected. Representative patient data are presented in Table 2, below, and illustrate this trend.
- EPR-1 therefore represents a novel cellular marker in CLL and its surface expression inversely correlates with the patient's biologic response to the therapy.
- the data further emphasize the possible participation of protease-mediated mechanisms in the development and/or establishment of selected hematopoietic malignancies.
- PCR Generation of EPR-1 DNA Using the amino acid residue sequences obtained for EPR-1 presented in Table 1, primer molecules were identified for PCR amplification of nucleic acids coding for the EPR-1 polypeptides, including EPR-1 itself. For instance, oligonucleotides that anneal with the (-) strand of DNA and that code for EPR-1 #1 and #3 amino acid residue sequences are: #1 5 ⁇ -AAAGGICAGACICAGGGIGCIGTIATGAT-3' ; #3 5'-TGCAAAITIIGIGAAGAAITICACAAA-3' .
- Probes complementary to those identified above can be used to hybridize with a (+) strand of RNA or DNA.
- one of the primers listed above should be used with a primer complementary to the other primer listed above so that extension products on both the (+) and (-) strands are generated simultaneously.
- the primers can be extended to include convenient restriction and cloning sites as desired. Since a #1 primer can anneal 5' and/or 3* to the #3 primer, usually both sets of primers and primer complements will be used in a PCR protocol. The reaction conditions and cycling protocol for PCR are well known and are described above. In these nudeotide probes, A is adenine, G is quanine, C is cytosine, T is thymine, and I is inosine.
- mAb 9D4 recognizing a different epitope from the one previously identified by mAb 7G12 [Altieri, D. C. , J. Biol. Chem.. 264:2969 (1989)], reacted with peripheral blood monocytes and dextran-isolated PMN, although with considerable heterogeneity in the latter population (Fig. 1) .
- NK-associated markers CD16 and CD56 were analyzed by FMF, mAb 7G12 and 9D4 reacted with 68 and 72% of these cells.
- EPR-1 + PBL were phenotypically established as CD3 + lymphocytes.
- Table 3 hereinafter, shows a representative study of two-color FMF characterization of this EPR-1 + subset. Although double-positive cells coexpressing either CD4 or CD8 were identified, the latter fraction consistently exhibited a higher frequency and a far greater intensity of reaction with EPR-1 marker mAb.
- EPR-1 + T cells also coexpressed CDllb and CD57(Leu 7), as revealed by mAb OKM1 and HNK-1 respectively, and approximately 70 to 80 percent were CD2 + (0KT11) (Table 3) .
- EPR-1 "1" subset was predominantly WT31 +
- Quantitatively comparable results were also obtained when two-color FMF analyses of PBL were carried out using biotin- conjugated aliquots of the rabbit polyclonal antibody B78.9, or the directly FITC-conjugated mAb 7G12, or 9D4, in combination with the various anti-T cell or anti-NK cell related markers mAb.
- Two-color FMF analysis of adherent cell-depleted PBL was carried out as follows: Suspensions of PBL were depleted of adherent cells and separately stained with aliquots of anti-CD16 mAb Leu lib, B73.1, or 3G8, or with anti-CD56 mAb NKH-1 (Leu 19) for 30 minutes at 4°C. Cells were washed and incubated with fluorescein-conjugated goat (F(ab') 2 anti-mouse IgG + IgM for additional 30 minutes at 4°C.
- F(ab') 2 anti-mouse IgG + IgM fluorescein-conjugated goat
- EPR-1 is distinct from CDllb/CD18.
- the expression of EPR-1 on monocytes, PMN, NK cells, and a fraction of T cells that is also predominantly CD8 + appears to mimic the cellular distribution of the leukocyte integrin CDllb/CD18 (Mac-1) [Sanchez Madrid, F., et al., J. EXP. Med.. 158:1785 (1983)].
- mAb 60.3 immunoprecipitated the polypeptides corresponding to the a subunits of the leukocyte integrins CDlla, CDlllb, and CDllc in association with the common ⁇ - subunit CD18, in agreement with previous observations [Sanchez Madrid, F. , et al., J. EXP. Med.. 158:1785
- CDllb/CD18 and EPR-1 have different ligand recognition specificities.
- CDllb/CD18 has been recognized as an oligo-specific receptor for C3bi, fibrinogen, and factor X [Sanchez Madrid, F., et al., J. Exp. Med.. 158:1785 (1983); Altieri, D. et al., J. Cell Biol.. 107:1893 (1988); Wright, S. D., et al., Proc. Natl. Acad. Sci. USA. 85:7734 (1988);
- EPR-1 binds the activated serine protease Xa [Altieri, D. et al. J. Biol. Chem.. 264:2969 (1989)].
- Anti-CDllb/CD18 mAb do not inhibit EPR-1 receptor function and the reverse also applies for EPR-1 mAb on CDllb/Cdl8 ligand recognition.
- soluble CDllb/CD18 ligands such as fibrinogen [Altieri, D. et al., J. Cell Biol.. 107:1893 (1988); Wright, S. D., et al., Proc. Natl. Acad. Sci. USA. 85:7734 (1988)], and factor X [Altieri, D. C. , et al., J. Biol. Chem. f 263:7007 (1988)], do not compete or inhibit EPR-1 receptor recognition of Xa.
- PBMC peripheral blood mononuclear cells
- PHA polyclonal activators
- Con A polyclonal activators
- Con A-stimulated PBMC were sequentially analyzed by FMF after various time intervals of culture.
- Con A-mediated quantitative expansion of the EPR-1 + subset occurred in cells with forward light scatter characteristic of proliferating, activated blasts. The number of these cells increased approximately four-fold between day 6 and 7 of culture and when these cells were phenotypically characterized by two-color FMF they were CD3 + , CD4 " , CD8 + , CD2 + . Additional studies were carried out to investigate the effects of long term alloreactive stimulation on EPR-1 expression.
- EPR-1 Expressed on T Cells is Functionally Active Protease Receptor.
- a number of transformed in vitro T cell lines were screened by FMF using the panel of mAb described above. As shown in Figure 4, of the various T cell lines assayed only a subpopulation of HuT 78 cells was reactive with mAb 7G12. These cells were isolated to >90% purity by fluorescence sorting using the polyclonal antiserum B78.9 to yield the subpopulation HuT 78*, which was then cloned by limiting dilution.
- HuT 78* cells reacting with the rabbit polyclonal antiserum B78.9 were isolated to 94.2% purity by fluorescence sorting and cloned by limiting dilution. Three clones were established, phenotypically characterized and one ⁇ HuT 78*-3 ⁇ selected for further investigations.
- EPR-1 + a small fraction of circulating T cells was also identified as EPR-1 + .
- Phenotypic characterization of this subset by FMF suggested that the expression of EPR-1 does not appear to be segregated into a unique subpopulation defined by currently known markers of T cells.
- EPR-1 + T cells isolated from various donors was also CD8 + or ⁇ /BTCR + , cells coexpressing CD4 or / ⁇ TCR were identified as well.
- FMF analysis of various transformed T cell lines in vitro revealed expression of EPR-1 markers on MOLT 13 cells that were further phenotypically established as CD4 + and TCR / ⁇ + , respectively, in agreement with previous observations [Lefranc, M. P., et al.. Nature. 316:464 (1985); Brenner, M. B., et al.. Nature, 325:689 (1987)].
- EPR-1 expression was consistently associated with coexpression of CDllb(Leu 15) and CD57(Leu 7), as identified by mAbs OKM1 and HNK-1.
- this pattern of markers has been associated with suppressor function [Clement, L. T., et al., J. Immunol.. 133:2461 (1984); Fox, E. J. , et al., J. Exp. Med. t 166:404 (1987); Takeuchi, T., et al.. Cell. Immunol.. 111:398 (1988)] and LAK activity [Dianzani, et al., Eur. J. Immunol.. 19:1037 (1989)].
- EPR-1 represents a cell surface molecule homologous to the plasma coagulation protein V maintaining some conserved immunoreactive epitopes functionally associated with ligand recognition.
- EPR-1 would embody the requirements for a surface receptor expressed by immune effector cells, displaying ligand recognition for a prototypical and highly conserved serine protease such as factor Xa, and dynamically up-regulated by antigenic stimulation.
- EPR- 1 the name “EPR- 1” is proposed to tentatively identify this molecule.
- EPR-1 the role of EPR-1 in the mechanism of cell- mediated formation of fibrin is highlighted by its recognition for Xa [Nesheim, M. E., et al., J. Biol. Chem.. 254:10952 (1979)]
Abstract
Description
Claims
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AU17885/92A AU664994B2 (en) | 1991-03-12 | 1992-03-12 | Cell surface receptors homologous to coagulation factors V and VIII |
JP4510597A JPH06506696A (en) | 1991-03-12 | 1992-03-12 | Cell surface receptor homologous to coagulation factors 5 and 8 |
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US66795791A | 1991-03-12 | 1991-03-12 | |
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EP (1) | EP0578757A4 (en) |
JP (1) | JPH06506696A (en) |
AU (1) | AU664994B2 (en) |
CA (1) | CA2105993A1 (en) |
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Cited By (16)
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WO1995020655A1 (en) * | 1994-01-28 | 1995-08-03 | The Scripps Research Institute | Novel cell surface receptor, antibody compositions, and methods of using same |
US5877289A (en) * | 1992-03-05 | 1999-03-02 | The Scripps Research Institute | Tissue factor compositions and ligands for the specific coagulation of vasculature |
US6004555A (en) * | 1992-03-05 | 1999-12-21 | Board Of Regents, The University Of Texas System | Methods for the specific coagulation of vasculature |
US6036955A (en) * | 1992-03-05 | 2000-03-14 | The Scripps Research Institute | Kits and methods for the specific coagulation of vasculature |
US6093399A (en) * | 1992-03-05 | 2000-07-25 | Board Of Regents, The University Of Texas System | Methods and compositions for the specific coagulation of vasculature |
US6749853B1 (en) | 1992-03-05 | 2004-06-15 | Board Of Regents, The University Of Texas System | Combined methods and compositions for coagulation and tumor treatment |
US7183064B1 (en) * | 1999-04-21 | 2007-02-27 | Biosceptre Pty Ltd | Method for identifying pre-neoplastic and/or neoplastic states in mammals |
US7531171B2 (en) | 2001-01-17 | 2009-05-12 | Intreat Pty Limited | Antibodies to non-functional P2X7 receptor |
US8067550B2 (en) | 2006-10-10 | 2011-11-29 | Biosceptre International Limited | Hybridomas producing antibodies against non functional P2X7 receptor |
US8440186B2 (en) | 2007-09-14 | 2013-05-14 | Biosceptre International Limited | P2X7 epitopes |
US8597643B2 (en) | 2008-07-04 | 2013-12-03 | Biosceptre International Limited | Antibodies for binding to non-functional P2X7 receptors in trimeric form |
US8658385B2 (en) | 2007-09-14 | 2014-02-25 | Biosceptre International Limited | Purinergic (P2X) receptors in extra-cellular body fluid |
US8835609B2 (en) | 2009-12-24 | 2014-09-16 | Biosceptre International Limited | Antigen binding sites to non-functional oligomeric P2X7 receptors and methods of use thereof |
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-
1992
- 1992-03-09 IE IE920765A patent/IE920765A1/en not_active Application Discontinuation
- 1992-03-12 JP JP4510597A patent/JPH06506696A/en active Pending
- 1992-03-12 CA CA002105993A patent/CA2105993A1/en not_active Abandoned
- 1992-03-12 AU AU17885/92A patent/AU664994B2/en not_active Ceased
- 1992-03-12 PT PT10023592A patent/PT100235B/en active IP Right Grant
- 1992-03-12 WO PCT/US1992/002109 patent/WO1992016558A1/en not_active Application Discontinuation
- 1992-03-12 EP EP92910343A patent/EP0578757A4/en not_active Withdrawn
Non-Patent Citations (6)
Title |
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Journal of Biological Chemistry, Volume 264, No. 5, issued 15 February 1989, ALTIERI et al., "Sequential Receptor Cascade for Coagulation Proteins on Monocytes", pages 2969-2972, see entire document. * |
Journal of Immunology, Volume 145, No. 1, 01 July 1990, ALTIERI et al., "Identification of Effector Cell Protease Receptor-1: A Leukocyte-Distributed Receptor for the Serine Protease Factor Xa", pages 246-253, see entire document. * |
LEWIN, "GENES", published 1987 by John Wiley and Sons (N.Y.), see page 104. * |
Methods in Enzymology, Volume 182, issued 1990, GERARD, "Purification of Glycoproteins", pages 529-539, see pages 529-539. * |
Methods in Enzymology, Volume 182, issued 1990, OSTROVE, "Affinity Chromoatography. General Methods", pages 357-379, see pages 357-379. * |
See also references of EP0578757A4 * |
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Also Published As
Publication number | Publication date |
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JPH06506696A (en) | 1994-07-28 |
IE920765A1 (en) | 1992-09-23 |
PT100235A (en) | 1993-07-30 |
AU664994B2 (en) | 1995-12-14 |
AU1788592A (en) | 1992-10-21 |
EP0578757A4 (en) | 1995-08-30 |
PT100235B (en) | 1999-06-30 |
CA2105993A1 (en) | 1992-09-13 |
EP0578757A1 (en) | 1994-01-19 |
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