CA2113907C - Apparatus and methods for electroporation amd electrofusion - Google Patents
Apparatus and methods for electroporation amd electrofusion Download PDFInfo
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- CA2113907C CA2113907C CA002113907A CA2113907A CA2113907C CA 2113907 C CA2113907 C CA 2113907C CA 002113907 A CA002113907 A CA 002113907A CA 2113907 A CA2113907 A CA 2113907A CA 2113907 C CA2113907 C CA 2113907C
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/02—Preparation of hybrid cells by fusion of two or more cells, e.g. protoplast fusion
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M35/00—Means for application of stress for stimulating the growth of microorganisms or the generation of fermentation or metabolic products; Means for electroporation or cell fusion
- C12M35/02—Electrical or electromagnetic means, e.g. for electroporation or for cell fusion
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N13/00—Treatment of microorganisms or enzymes with electrical or wave energy, e.g. magnetism, sonic waves
Abstract
An insulating film (20) in a container has pores (28) whose diameter is smaller than the diameter of a first type of cells (60) in the container. The first type of cells are trapped in the pores, so that when an electric field is applied to the container, electro-poration of the first cells occurs. If a second type of cells (70), smaller than the first type of cells, are also trapped in the pores, electrofusion will occur between the first and second types of cells trapped in the same pores.
Description
~~ 93/02178 ~ ~ ~ ~ ~ ~ ~ PC,T/US92/05855 APPARATUS AND METciODS FOR ELECTROPORATION AND E~ECTROFUSION
Background of the Invention Methods of Electraporation and Electrofusion This invention relates generally to the fields of electroporation and electrofusion, and more specifically to electroporation and electrofusion using low level electric fields.
Electroporatian involves the opening of the cell membrane, usually to allow genetic ar other material to pass into or out of the cell. iahen genes are employed, this activity is l~nown as genetic transfection.
Electrofusion, or cell-cell joining. in~.rolves the fusion of membranes of different cells after their membranes ~ have been opened by electroporation: Electrofusion is used to form new cells (hybridomas) with unique properties, or to geneticallyPreprogram exista.ng cells such as for plant breeding or genetic ens~ineering.
Conventianal methods of opening cell membranes for transfection or cell fusion use inactivated viruses or chemicals such as polyethylene glycol (PEG). These techniques have certain disadvantages. Strict controls are needed in the case of viral transfec~tion to prevent unwanted contamination. Also there are problems with unwanted biologic respanses> Furthermore tlae chemical side effects of PEG transfection or fusion can adversely affect cellular viability.
Electric-field induced fusion, ar electrofusion, has shown promising results. In electrofusion, different types of cells are plao~d in close contact by applying non-uniform alternating current electric fields to a solution of those 'cells. The''el~ctrac fields G~:use dieleetraphoresis, which in turn causes cells to move to a region of highest (field intensity and organize into formations of variable length.
once close cell-to-cell membrane contact is achieved, fusion occurs by subjecting the cells to one or more pulses of high intensity electric fields. The high intensity fields VV~ 93/02978 ~3g ~~ PCT/IJ~92/Q585° ...
~'~~..
first cause reversible electric breakdown in the zone of ' contact between the two cells, and then fusion of the two cells occurs.
This process, however, also has some drawbacks.
Conventional electrofusion causes an unnatural chemical environment in the low conductivity solutions. Also, some conventional elec~rofusion produces random because of cell suspensions. In electrofusing cells A & B, the resulting fused cells could be composed of A:A, B:B, A:A:B, A:B:B, etc., as well as the desired result of simply A:B.
It is therefore an object of this invention to provide methods and apparatus for electrnporation and electrofusion which yield more predictable results than conventional y methods.
Another object of this invention is to provide methods and apparatus for electroporation and electrofusion'which minimize damage caused to the cells:
summary To achieve the objects of this invention, a method of electroporation o~ a first type of cells is provided by placing the first type of cells in a solution held by a container in which an insulating film divides the container into two portions. The film is penetrated by pores whose diameter is sma3.~.er than the diameter of the first type of cells. Next, the fi~st'type of cells are trapped in da.fferent ones of the pores. ~o that a portion of each of the trapped cells extends into 'the different one of the pores.
F2n~ally, an electric field is applied to the container to clause electroporation of'~he trapped first type of cells.
A method of e~.ectrofusion of a first type of cells with ~a secondtype of ells according to this invention, where the fist type of cells axe larger than the second type of cells, comprises~t~e'steps of placing the first type of cells in a solution held by a container across which is placed an insu3.atang film penetrated by pores whose diameter is smaller than the diameter of the first tyke of yells; causing the first type of cells to be gapped in a different ones of the pores such that a portion of each of the trapped first cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film; placing the second type of cells in the container; causing trapped ones of the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the trapped second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to cause electrofusion of the ones first type of cells and second type of cells which are in the same pores in contact with one another.
More particularly, the invention provides a method of electroporation of a first type of cells comprising the steps of: placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells; causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and applying a low voltage electric field of less than 25 volts to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores.
According to another aspect the invention provides a method of electrofusion of a first type of cells with a 3a second type of cells, the first type of cells being larger than the second type of cells, the method comprising the step of: placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells, and the first type of cells being placed in a first one of the two sections;
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film; placing the second type of cells in a second one of the two sections of the container; causing the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores and of the second type of cells in the pores, and then to cause electrofusion of the first type of cells and second type of cells which are in the same pores in contact with one another.
According to yet another aspect the invention provides an apparatus for electroporation of a first type of cells comprising: a container; an insulating film, penetrated by pores, dividing the container into two sections; a first type of cells in a solution in one of the sections, the diameter of the first type of cells being 3b larger than the diameter of the pores; means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and means for applying a low voltage electric field of less than 25 volts to the container to cause electroporation of the trapped first type of cells.
The accompanying drawings, which are incorporated in and which constitute a part of this specification, illustrate an implementation of this invention and, together with the accompanying textual description, explain the principles of the invention.
Brief Description of the Drawings Figure 1 is a diagram of a preferred embodiment of the invention;
Figure 2 is a top view of the insulating film shown in Figure 1;
Figure 3 shows an insulating film with one type of cells trapped within a pore;
Figure 4 shows an insulating film with two kinds of cells trapped within a pore;
Figure 5 shows a circuit diagram illustrating the operation of the electric fields on the preferred embodiment of this invention; and Figure 6 shows a different shape for an insulating film according to this invention.
3c Description of Preferred Embodiments Reference will now be made in detail to a preferred embodiment of this invention illustrated in the accompanying drawings.
e'V~ 93/U2a78 ~~J~ ~1'~ ~'CT/LJ~92/0~855 Figure 1 is a diagram of a preferred apparatus according to the present invention. In Figure 1, a container includes an insulating film 20 which is placed across container 10 at about container 20~s midpoint to divide container 10 into two portions 35 and 36. The exact location of insulated film 20 in container 10 is not critical, however, nor is its shape, as explained below, Preferably insulating film is extremely thin, on the order of 10-15 microns. Such filters are commercially available, such as the Nuclepore filter manufactured by Costar Corporation of Cambridge, Massachusetts.
Tnsulating film 20 is penetrated by several pores, as can be seen in Figure 2, which is a top view of film 20.
Poxes 25 are distributed throughout film 20 either randomly, as in Figure 2, or in some type of order.
For electroporation or electrofusion according to the invention, a first type of cells, such as myeloma cells, are placed into portion 35 of the container 10. Although the following discussion refers to cells, the invention operates with cell nuclei also. The cells are preferably suspended in either a low conductivity solution containing sugar, such as mannitol or sorbitol, or a high conductivity solution, such a Ringers solution or tissue culture media.
The size of pores 25 should be chosen so that the diameter of the pores is smaller than the diameter of the first type of ce3.ls, but large enough to allow the first type of cells to be trapped in the pores, as illustrated in Figure 3. Figure 3 shcaws a cutaway view of a cell 50 trapped in pore 26 of film 20 sudh that a portion of cell 50 extends substantially into pore 26 from a first side 21 of insulating film 20. The relative sizes of pores 25 and 26 and;the first type of cells ensures that the first type of cells will become trapped in the pores as shown in Figure 3.
The first type of dells can be trapped in pores 25 of film 20 by pressure, such as by using a hydrostatic pressure head from a regulated pressure source (not shown) or a vacuum source (not shown) supplied by lines 11 and 12. The cells ~vo 9~io~a~~ ~cr~us9zioss~~
can also be trapped by letting the cells settle into pores 25 by gravity or by placing container 10 in a centrifuge.
Once the first type of cells are trapped, a low voltage pulse is applied to the solution via electrodes 18 and 19 which are located on opposite sides of container ~Ø That ' pulse generates an electric field i.n the solution which causes electroporation of the portions of those cells which extend into pores 25. A preferred magnitude of the voltage pulse is on the order of one to twenty-five volts.
After electroporation occurs, changes in the pressure across film 20 cause the cells either to expel materials 'into the solution on the second side 22 of the insulating film 20, or to pull inn such materials. The ingress or egress of material for each cell takes place through the electroporated s hole in the cell wall.
When the pressure gradient across insulating fa.lm 20 is A
positive (i.e. is higher in portion 35 than in portion 3~b), the contents of the trapped first type of cells are expelled.
When the pressure gradient across the film is negative, or decreases from a positive value, the trapped first type of cells will pull in material, such as genetic material (DNA), from portion 36. Lymphocytes, or isolated nuclei will be too large to be pulled in through the electroporated membrane, but can be brought into more intimate contact with the first type of cells by pressure manipulation. The ingress or egress of material takes place through the electroporated holes in the cells walls. By coordinating the timing of any pressure changes with the pulses which cause electroporation, the amount of material passing into or out of the trapped cells can be controlled.
Once the'first type of cells are trapped in the pores of the: insulating film 20, electrofusion can occur by introducing a second type of cell or cell nuclei into portion 3~ of container 10 (Figure 1), and causing the second cells to move towards the second'side 22 of film 20 and contact ones of the trapped first type of cells in pores 25.
WO 93/021 Z 4~ ~~ ~ ~ PCT/~JS92/0585~
~ ~.1 For electrofusion, the size of pores 25 in film 20 should be selected so that the proper amount of secondary material, or a single second cell ar cell nucleus, can enter a pore in film 20 and be properly oriented adjacent to trapped cell type 1. Figure ~ shows insulating film 20 with a portion of a first type of cell 60 being trapped inside pore 28, and a second type of cell 70 also being trapped inside pore 28 adjacent to cell 60. when a pulse of one to twenty-five valts is applied to insulating film 20, both cell 60 and cell 70 electroporate at a location 65 where both cells contact. Electrofusion will then accur within the channel of pore 28 of insulating film 20 when the field from the pulse is removed. It is important to insure that the size of pore 20 is only large enough to fit a single small second type of cell so that only one of each type of cell is involved,in electrofusion. .
when the second type of cell 70 electroporates, a second hale can be formed at location 75 if cell 70 is small enough to fit entirely witha.n the pore. ~h~.s hole will close by itself, however, when a reversible electroparation electric field is used. Persons of ordinary skill in the art will recognize that poration ~.~ reversible below certain energy levels (pulse width and pulse height).
Figure 5 shows an equiva~.ient circuit diagram which illustrates the operation of the electrical fields in the preferred embodiment o~ this invention. In Figure 5, there is a source 100 of an electrical field which has an impedance 115 of 50 ohms. That is coupled to insulating film 20 by another impedance 120 of x.00 ohms representing the resistance due to the electralyte column above the insulating film.
Lnsulatimg film 20 includes a filter capacitance 130, a cell membrane capacitance x.35, and a leakage resistance 140 around the pores of film 20. Capacitance 135 represents the cell membrane capacitance of the trapped cell. Where is another 1(l0 ohm resistance 160 in the path to ground representing the resis~tance:~f the electrolyte column below the insulating film:
o~e!~ g~ioza7s ~e-eius~zios~ss For a leakage resistance of 150 ohms, the total resistance seen by load generator 110 will be 400 ohms when the filter capacitance 130 and the cell membrane capacitance 135 are fully charged. The voltage drop across the insulating film 20 will then be 150/400 V, where V is the voltage of generator 110. if V is 10 volts, then the voltage across the filter will be 3.75 volts. for, a filter with a thickness of 10 microns, the voltage gradient would be 3.75 volts/10 microns or 3750 volts/centimeter.
One advantage of this invention is that the heating caused by the holds is minima.. If laad generator 110 generates 10 volts, the current will be only 10 volts/400 ohms or 0.025A. The heating due to that current, 12R, equals (0.025A)2 (400 ohms) or 0425 watts. This figure, however, is the total power diss~.pated by the entire circuit. The power dissipat~.on across the filter of the cells is only (0.25A)2 (150 ohms) or O.O~h watts. Such heating can be kept from harming the cells or material by the heat capacity of the solution itself or, if necessary, by either water jackets or outside cooling.
Preferab7.y, the method of this invention is carried out by filling portion 35 of coratai:ner 10 with a solution of the first type of cells to trap a sufficient number of the first type of cells within the pores 25 of insulating film 20.
Container 10 is then inverted, ensuring that a hydrostatic pressure is app~.ied sufficieht to keep the trapped first type of cells in the pores. The secondary material, such as the second type o~ cells, is then introduced into the portion 35 of container l0, and gravity will force 'the second type of materials into the pores 25 which already contain first type of cells.. Application of the appropriate electric field then causes the electroporation and electrofusion as described above. tether methods, such as those discussed above, may also be used to trap the (first and second type of cells:
Preferably, container 10 can be made using materials such as polycarbonate pipe, and insulating film 20 can be ,.
made using a track-etched palycarbonate filter which is glued dW~ 93/02178 ~ ~~ ~CT/U592/058~-_ _ s inside of the pipe. Container 1.0 is connected to lines 11, 12, 13, and 14 (Figure 1) via appropriate fittings. As explained above, lines 21 and 12 are connected to a pressure source (not shown) such as a pump. Lines'13 and 14 allow the infusion of cells or secondary material. Stopcocks 15 and 1~' in lines 11 and l2, respectively, control pressure difference between lines 11 and 12, and thereby control the pressure in w container 10.
Electrofusion takes plane because the increasing current flux through the pores produces an electrical field gradient whose strength is between 0.8 and 3xv/cm which is necessary to ele~~roparate the cellular wall. ~iecause the only portions of the cell which experience the higher voltage gradients are inside of a pore of the insulating film 20, w only those portions are electroporated.
An~advantage of this invention is that the use of lower voltages for e~.ectropor~tion, coup~.ed with the use of porous electrodes, can greatly reduce electrolysis. This is because it is possible to couple entirely by electrode capacitance, and the electrodes are not directly adjacent to the cells.
To reduce electrolysis further, the electrodes used to apply the fields should be made of metals, such as tantalum, or titanium, carbon or other inert, materials.
Persons of ordinary sill will recognize that madification~ and variations may be made to this invention without departing-from the spirit and scope of the general inventive concept. For'example, insu~.ating film 20 could be tubular; such as shown in Figure 6. Such a film woul3 be useful in a bioreactor. This invention in its broader aspects is therefore not limited to the specific details or representative methods shown and described.
Background of the Invention Methods of Electraporation and Electrofusion This invention relates generally to the fields of electroporation and electrofusion, and more specifically to electroporation and electrofusion using low level electric fields.
Electroporatian involves the opening of the cell membrane, usually to allow genetic ar other material to pass into or out of the cell. iahen genes are employed, this activity is l~nown as genetic transfection.
Electrofusion, or cell-cell joining. in~.rolves the fusion of membranes of different cells after their membranes ~ have been opened by electroporation: Electrofusion is used to form new cells (hybridomas) with unique properties, or to geneticallyPreprogram exista.ng cells such as for plant breeding or genetic ens~ineering.
Conventianal methods of opening cell membranes for transfection or cell fusion use inactivated viruses or chemicals such as polyethylene glycol (PEG). These techniques have certain disadvantages. Strict controls are needed in the case of viral transfec~tion to prevent unwanted contamination. Also there are problems with unwanted biologic respanses> Furthermore tlae chemical side effects of PEG transfection or fusion can adversely affect cellular viability.
Electric-field induced fusion, ar electrofusion, has shown promising results. In electrofusion, different types of cells are plao~d in close contact by applying non-uniform alternating current electric fields to a solution of those 'cells. The''el~ctrac fields G~:use dieleetraphoresis, which in turn causes cells to move to a region of highest (field intensity and organize into formations of variable length.
once close cell-to-cell membrane contact is achieved, fusion occurs by subjecting the cells to one or more pulses of high intensity electric fields. The high intensity fields VV~ 93/02978 ~3g ~~ PCT/IJ~92/Q585° ...
~'~~..
first cause reversible electric breakdown in the zone of ' contact between the two cells, and then fusion of the two cells occurs.
This process, however, also has some drawbacks.
Conventional electrofusion causes an unnatural chemical environment in the low conductivity solutions. Also, some conventional elec~rofusion produces random because of cell suspensions. In electrofusing cells A & B, the resulting fused cells could be composed of A:A, B:B, A:A:B, A:B:B, etc., as well as the desired result of simply A:B.
It is therefore an object of this invention to provide methods and apparatus for electrnporation and electrofusion which yield more predictable results than conventional y methods.
Another object of this invention is to provide methods and apparatus for electroporation and electrofusion'which minimize damage caused to the cells:
summary To achieve the objects of this invention, a method of electroporation o~ a first type of cells is provided by placing the first type of cells in a solution held by a container in which an insulating film divides the container into two portions. The film is penetrated by pores whose diameter is sma3.~.er than the diameter of the first type of cells. Next, the fi~st'type of cells are trapped in da.fferent ones of the pores. ~o that a portion of each of the trapped cells extends into 'the different one of the pores.
F2n~ally, an electric field is applied to the container to clause electroporation of'~he trapped first type of cells.
A method of e~.ectrofusion of a first type of cells with ~a secondtype of ells according to this invention, where the fist type of cells axe larger than the second type of cells, comprises~t~e'steps of placing the first type of cells in a solution held by a container across which is placed an insu3.atang film penetrated by pores whose diameter is smaller than the diameter of the first tyke of yells; causing the first type of cells to be gapped in a different ones of the pores such that a portion of each of the trapped first cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film; placing the second type of cells in the container; causing trapped ones of the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the trapped second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to cause electrofusion of the ones first type of cells and second type of cells which are in the same pores in contact with one another.
More particularly, the invention provides a method of electroporation of a first type of cells comprising the steps of: placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells; causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and applying a low voltage electric field of less than 25 volts to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores.
According to another aspect the invention provides a method of electrofusion of a first type of cells with a 3a second type of cells, the first type of cells being larger than the second type of cells, the method comprising the step of: placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells, and the first type of cells being placed in a first one of the two sections;
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film; placing the second type of cells in a second one of the two sections of the container; causing the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores and of the second type of cells in the pores, and then to cause electrofusion of the first type of cells and second type of cells which are in the same pores in contact with one another.
According to yet another aspect the invention provides an apparatus for electroporation of a first type of cells comprising: a container; an insulating film, penetrated by pores, dividing the container into two sections; a first type of cells in a solution in one of the sections, the diameter of the first type of cells being 3b larger than the diameter of the pores; means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and means for applying a low voltage electric field of less than 25 volts to the container to cause electroporation of the trapped first type of cells.
The accompanying drawings, which are incorporated in and which constitute a part of this specification, illustrate an implementation of this invention and, together with the accompanying textual description, explain the principles of the invention.
Brief Description of the Drawings Figure 1 is a diagram of a preferred embodiment of the invention;
Figure 2 is a top view of the insulating film shown in Figure 1;
Figure 3 shows an insulating film with one type of cells trapped within a pore;
Figure 4 shows an insulating film with two kinds of cells trapped within a pore;
Figure 5 shows a circuit diagram illustrating the operation of the electric fields on the preferred embodiment of this invention; and Figure 6 shows a different shape for an insulating film according to this invention.
3c Description of Preferred Embodiments Reference will now be made in detail to a preferred embodiment of this invention illustrated in the accompanying drawings.
e'V~ 93/U2a78 ~~J~ ~1'~ ~'CT/LJ~92/0~855 Figure 1 is a diagram of a preferred apparatus according to the present invention. In Figure 1, a container includes an insulating film 20 which is placed across container 10 at about container 20~s midpoint to divide container 10 into two portions 35 and 36. The exact location of insulated film 20 in container 10 is not critical, however, nor is its shape, as explained below, Preferably insulating film is extremely thin, on the order of 10-15 microns. Such filters are commercially available, such as the Nuclepore filter manufactured by Costar Corporation of Cambridge, Massachusetts.
Tnsulating film 20 is penetrated by several pores, as can be seen in Figure 2, which is a top view of film 20.
Poxes 25 are distributed throughout film 20 either randomly, as in Figure 2, or in some type of order.
For electroporation or electrofusion according to the invention, a first type of cells, such as myeloma cells, are placed into portion 35 of the container 10. Although the following discussion refers to cells, the invention operates with cell nuclei also. The cells are preferably suspended in either a low conductivity solution containing sugar, such as mannitol or sorbitol, or a high conductivity solution, such a Ringers solution or tissue culture media.
The size of pores 25 should be chosen so that the diameter of the pores is smaller than the diameter of the first type of ce3.ls, but large enough to allow the first type of cells to be trapped in the pores, as illustrated in Figure 3. Figure 3 shcaws a cutaway view of a cell 50 trapped in pore 26 of film 20 sudh that a portion of cell 50 extends substantially into pore 26 from a first side 21 of insulating film 20. The relative sizes of pores 25 and 26 and;the first type of cells ensures that the first type of cells will become trapped in the pores as shown in Figure 3.
The first type of dells can be trapped in pores 25 of film 20 by pressure, such as by using a hydrostatic pressure head from a regulated pressure source (not shown) or a vacuum source (not shown) supplied by lines 11 and 12. The cells ~vo 9~io~a~~ ~cr~us9zioss~~
can also be trapped by letting the cells settle into pores 25 by gravity or by placing container 10 in a centrifuge.
Once the first type of cells are trapped, a low voltage pulse is applied to the solution via electrodes 18 and 19 which are located on opposite sides of container ~Ø That ' pulse generates an electric field i.n the solution which causes electroporation of the portions of those cells which extend into pores 25. A preferred magnitude of the voltage pulse is on the order of one to twenty-five volts.
After electroporation occurs, changes in the pressure across film 20 cause the cells either to expel materials 'into the solution on the second side 22 of the insulating film 20, or to pull inn such materials. The ingress or egress of material for each cell takes place through the electroporated s hole in the cell wall.
When the pressure gradient across insulating fa.lm 20 is A
positive (i.e. is higher in portion 35 than in portion 3~b), the contents of the trapped first type of cells are expelled.
When the pressure gradient across the film is negative, or decreases from a positive value, the trapped first type of cells will pull in material, such as genetic material (DNA), from portion 36. Lymphocytes, or isolated nuclei will be too large to be pulled in through the electroporated membrane, but can be brought into more intimate contact with the first type of cells by pressure manipulation. The ingress or egress of material takes place through the electroporated holes in the cells walls. By coordinating the timing of any pressure changes with the pulses which cause electroporation, the amount of material passing into or out of the trapped cells can be controlled.
Once the'first type of cells are trapped in the pores of the: insulating film 20, electrofusion can occur by introducing a second type of cell or cell nuclei into portion 3~ of container 10 (Figure 1), and causing the second cells to move towards the second'side 22 of film 20 and contact ones of the trapped first type of cells in pores 25.
WO 93/021 Z 4~ ~~ ~ ~ PCT/~JS92/0585~
~ ~.1 For electrofusion, the size of pores 25 in film 20 should be selected so that the proper amount of secondary material, or a single second cell ar cell nucleus, can enter a pore in film 20 and be properly oriented adjacent to trapped cell type 1. Figure ~ shows insulating film 20 with a portion of a first type of cell 60 being trapped inside pore 28, and a second type of cell 70 also being trapped inside pore 28 adjacent to cell 60. when a pulse of one to twenty-five valts is applied to insulating film 20, both cell 60 and cell 70 electroporate at a location 65 where both cells contact. Electrofusion will then accur within the channel of pore 28 of insulating film 20 when the field from the pulse is removed. It is important to insure that the size of pore 20 is only large enough to fit a single small second type of cell so that only one of each type of cell is involved,in electrofusion. .
when the second type of cell 70 electroporates, a second hale can be formed at location 75 if cell 70 is small enough to fit entirely witha.n the pore. ~h~.s hole will close by itself, however, when a reversible electroparation electric field is used. Persons of ordinary skill in the art will recognize that poration ~.~ reversible below certain energy levels (pulse width and pulse height).
Figure 5 shows an equiva~.ient circuit diagram which illustrates the operation of the electrical fields in the preferred embodiment o~ this invention. In Figure 5, there is a source 100 of an electrical field which has an impedance 115 of 50 ohms. That is coupled to insulating film 20 by another impedance 120 of x.00 ohms representing the resistance due to the electralyte column above the insulating film.
Lnsulatimg film 20 includes a filter capacitance 130, a cell membrane capacitance x.35, and a leakage resistance 140 around the pores of film 20. Capacitance 135 represents the cell membrane capacitance of the trapped cell. Where is another 1(l0 ohm resistance 160 in the path to ground representing the resis~tance:~f the electrolyte column below the insulating film:
o~e!~ g~ioza7s ~e-eius~zios~ss For a leakage resistance of 150 ohms, the total resistance seen by load generator 110 will be 400 ohms when the filter capacitance 130 and the cell membrane capacitance 135 are fully charged. The voltage drop across the insulating film 20 will then be 150/400 V, where V is the voltage of generator 110. if V is 10 volts, then the voltage across the filter will be 3.75 volts. for, a filter with a thickness of 10 microns, the voltage gradient would be 3.75 volts/10 microns or 3750 volts/centimeter.
One advantage of this invention is that the heating caused by the holds is minima.. If laad generator 110 generates 10 volts, the current will be only 10 volts/400 ohms or 0.025A. The heating due to that current, 12R, equals (0.025A)2 (400 ohms) or 0425 watts. This figure, however, is the total power diss~.pated by the entire circuit. The power dissipat~.on across the filter of the cells is only (0.25A)2 (150 ohms) or O.O~h watts. Such heating can be kept from harming the cells or material by the heat capacity of the solution itself or, if necessary, by either water jackets or outside cooling.
Preferab7.y, the method of this invention is carried out by filling portion 35 of coratai:ner 10 with a solution of the first type of cells to trap a sufficient number of the first type of cells within the pores 25 of insulating film 20.
Container 10 is then inverted, ensuring that a hydrostatic pressure is app~.ied sufficieht to keep the trapped first type of cells in the pores. The secondary material, such as the second type o~ cells, is then introduced into the portion 35 of container l0, and gravity will force 'the second type of materials into the pores 25 which already contain first type of cells.. Application of the appropriate electric field then causes the electroporation and electrofusion as described above. tether methods, such as those discussed above, may also be used to trap the (first and second type of cells:
Preferably, container 10 can be made using materials such as polycarbonate pipe, and insulating film 20 can be ,.
made using a track-etched palycarbonate filter which is glued dW~ 93/02178 ~ ~~ ~CT/U592/058~-_ _ s inside of the pipe. Container 1.0 is connected to lines 11, 12, 13, and 14 (Figure 1) via appropriate fittings. As explained above, lines 21 and 12 are connected to a pressure source (not shown) such as a pump. Lines'13 and 14 allow the infusion of cells or secondary material. Stopcocks 15 and 1~' in lines 11 and l2, respectively, control pressure difference between lines 11 and 12, and thereby control the pressure in w container 10.
Electrofusion takes plane because the increasing current flux through the pores produces an electrical field gradient whose strength is between 0.8 and 3xv/cm which is necessary to ele~~roparate the cellular wall. ~iecause the only portions of the cell which experience the higher voltage gradients are inside of a pore of the insulating film 20, w only those portions are electroporated.
An~advantage of this invention is that the use of lower voltages for e~.ectropor~tion, coup~.ed with the use of porous electrodes, can greatly reduce electrolysis. This is because it is possible to couple entirely by electrode capacitance, and the electrodes are not directly adjacent to the cells.
To reduce electrolysis further, the electrodes used to apply the fields should be made of metals, such as tantalum, or titanium, carbon or other inert, materials.
Persons of ordinary sill will recognize that madification~ and variations may be made to this invention without departing-from the spirit and scope of the general inventive concept. For'example, insu~.ating film 20 could be tubular; such as shown in Figure 6. Such a film woul3 be useful in a bioreactor. This invention in its broader aspects is therefore not limited to the specific details or representative methods shown and described.
Claims (19)
1. A method of electroporation of a first type of cells comprising the steps of placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells;
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and applying a low voltage electric field of less than 25 volts to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores.
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and applying a low voltage electric field of less than 25 volts to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores.
2. The method of claim 1 wherein the step of causing the first type of cells to become trapped in different ones of the pores includes the substep of introducing a pressure into the container to draw the first type of cells into the insulating film.
3. The method of claim 1 wherein the step of applying an electric field to the container includes the step of applying a low voltage pulse across the container.
4. The method of claim 1 further including the step of adjusting the pressure across the film to cause the trapped first type of cells to expel materials internal to the cell.
5. The method of claim 1 further including the step of adjusting the pressure across the film to cause the trapped first type of cells to pull in materials external to the cell.
6. The method of claim 5 further including the step of placing the materials to be pulled into the trapped first type of cells on a side of the insulating film opposite that of the trapped first type of cells before the electric field is applied to cause electroporation.
7. The method of claims 4 or 5 wherein the step of adjusting the pressure is synchronized with the step of applying the electric field to the container.
8. The method of claim 1 wherein the container has a top and a bottom, and wherein the filter is flat and is placed in the container a predetermined distance from the top of the container, and wherein the step of placing the first type of cells in the solution in the container includes the substep of placing the first type of cells into the container between the top of the container and the insulating film; and wherein the step of causing the first type of cells to become trapped in different ones of the pores includes the substep of waiting until the first type of cells settle in the different ones of the pores.
9. A method of electrofusion of a first type of cells with a second type of cells, the first type of cells being larger than the second type of cells, the method comprising the step of:
placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells, and the first type of cells being placed in a first one of the two sections;
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film;
placing the second hype of cells in a second one of the two sections of the container;
causing the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores and of the second type of cells in the pores, and then to cause electrofusion of the first type of cells and second type of cells which are in the same pores in contact with one another.
placing the first type of cells in a solution held by a container in which an insulating film divides the container into two sections, the insulation film being penetrated by pores whose diameter is smaller than the diameter of the first type of cells, and the first type of cells being placed in a first one of the two sections;
causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores, the trapped cells extending into a portion of the pores on a first side of the insulating film;
placing the second hype of cells in a second one of the two sections of the container;
causing the second type of cells to enter certain ones of the pores of the insulating film side into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores from a second side of the insulating film; and applying an electric field to the container to pass through the two sections and the pores thereby to cause electroporation of the trapped first type of cells at the portions of the trapped first type of cells which extend into said pores and of the second type of cells in the pores, and then to cause electrofusion of the first type of cells and second type of cells which are in the same pores in contact with one another.
10. The method of claim 9 wherein the step of causing the first type of cells to become trapped in different ones of the pores includes the substep of introducing a pressure into the container to draw the first type of cells to the insulating film.
11. The method of claim 9 wherein the step of applying an electric field to the container includes the step of applying a low voltage pulse to the container.
12. The method of claim 9 wherein the container has a top and a bottom, with the insulating film being flat and being located in the container a predetermined distance from the top of the container, and wherein the step of placing the first type of cells in the solution in the container includes the substep of placing the first type of cells into the container between the top of the container and the insulating film;
and wherein the step of causing the first type of cells to become trapped in different ones of the pores includes the substep of waiting until the first type of cells settle in the different ones of the pores.
and wherein the step of causing the first type of cells to become trapped in different ones of the pores includes the substep of waiting until the first type of cells settle in the different ones of the pores.
13. The method of claim 12 wherein the step of placing the second type of cells in the container includes the substep of placing the second type of cells in the container between the insulating film and the bottom of the container;
and wherein the step of causing the second type of cells to enter ones of the pores of the insulating film into which trapped first type of cells extend includes the substep of inverting the container.
and wherein the step of causing the second type of cells to enter ones of the pores of the insulating film into which trapped first type of cells extend includes the substep of inverting the container.
14. An apparatus for electroporation of a first type of cells comprising:
12a a container;
an insulating film, penetrated by pores, dividing the container into two sections;
a first type of cells in a solution in one of the sections, the diameter of the first type of cells being larger than the diameter of the pores;
means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and means for applying a low voltage electric field of less than 25 volts to the container to cause electroporation of the trapped first type of cells.
12a a container;
an insulating film, penetrated by pores, dividing the container into two sections;
a first type of cells in a solution in one of the sections, the diameter of the first type of cells being larger than the diameter of the pores;
means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores; and means for applying a low voltage electric field of less than 25 volts to the container to cause electroporation of the trapped first type of cells.
15. The apparatus of claim 14 wherein the means for causing the first type of cells to become trapped in different ones of the pores includes lines for introducing a pressure into the container to draw the first type of cells into the insulating film.
16. The apparatus of claim 14 wherein the means for applying an electric field to the container includes electrodes placed on opposite side of the container.
17. The apparatus of claim 14 wherein the insulating film is flat.
18. The apparatus of claim 14 wherein the insulating film is tubular.
19. An apparatus for electrofusion of a first type of cells with a second type of cells which are smaller than the first type of cells comprising:
a container containing an insulating film, penetrated by pores, which divides the container into two portions;
a first type of cells in a solution in one portion of the container, the diameter of the first type of cells being larger than the diameter of the pores;
means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores;
a second type of cells in the other portion of the container;
means for causing the second type of cells to enter from a second side of the insulating film ones of the pores of the insulating film into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores; and means for applying an electric field to the container to cause electrofusion of the trapped first type of cells and the second type of cells which are in the same ones of the pores and in contact with each other.
a container containing an insulating film, penetrated by pores, which divides the container into two portions;
a first type of cells in a solution in one portion of the container, the diameter of the first type of cells being larger than the diameter of the pores;
means for causing the first type of cells to become trapped in different ones of the pores such that a portion of each of the trapped first type of cells extends into a different one of the pores;
a second type of cells in the other portion of the container;
means for causing the second type of cells to enter from a second side of the insulating film ones of the pores of the insulating film into which trapped first type of cells extend and to contact trapped first type of cells, the second type of cells entering the certain pores; and means for applying an electric field to the container to cause electrofusion of the trapped first type of cells and the second type of cells which are in the same ones of the pores and in contact with each other.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US733,854 | 1991-07-22 | ||
| US07/733,854 US5173158A (en) | 1991-07-22 | 1991-07-22 | Apparatus and methods for electroporation and electrofusion |
| PCT/US1992/005855 WO1993002178A1 (en) | 1991-07-22 | 1992-07-21 | Apparatus and methods for electroporation and electrofusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2113907A1 CA2113907A1 (en) | 1993-02-04 |
| CA2113907C true CA2113907C (en) | 2002-12-24 |
Family
ID=24949376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002113907A Expired - Fee Related CA2113907C (en) | 1991-07-22 | 1992-07-21 | Apparatus and methods for electroporation amd electrofusion |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US5173158A (en) |
| EP (1) | EP0596003B1 (en) |
| AT (1) | ATE176278T1 (en) |
| AU (1) | AU2378092A (en) |
| CA (1) | CA2113907C (en) |
| DE (1) | DE69228309T2 (en) |
| WO (1) | WO1993002178A1 (en) |
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- 1992-07-21 CA CA002113907A patent/CA2113907C/en not_active Expired - Fee Related
- 1992-07-21 AU AU23780/92A patent/AU2378092A/en not_active Abandoned
- 1992-07-21 EP EP92916662A patent/EP0596003B1/en not_active Expired - Lifetime
- 1992-07-21 AT AT92916662T patent/ATE176278T1/en active
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| CA2113907A1 (en) | 1993-02-04 |
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| US5173158A (en) | 1992-12-22 |
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| EP0596003A4 (en) | 1995-12-06 |
| EP0596003B1 (en) | 1999-01-27 |
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| ATE176278T1 (en) | 1999-02-15 |
| AU2378092A (en) | 1993-02-23 |
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