WO2015199119A1 - 接着型細胞の培養方法、培養容器およびタンパク質の産生方法 - Google Patents
接着型細胞の培養方法、培養容器およびタンパク質の産生方法 Download PDFInfo
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Definitions
- the present invention relates to a method for culturing adherent cells that can be grown without dying even if the adherent cells are in a floating state, a liquid medium, and an adherent cell that is suspended and alive in the liquid medium.
- the present invention relates to a culture vessel using an alicyclic structure-containing polymer, and a protein production method.
- the target protein is produced by a genetic recombination method.
- recombinant drugs those containing as an ingredient an antibody used for cancer treatment or rheumatism treatment or a protein such as erythropoietin (EPO) which is a hormone for increasing red blood cells are known.
- EPO erythropoietin
- These recombinant drugs are considered to have a lower risk of unexpected side effects than conventional chemical synthesis drugs, and are attracting much attention.
- recombinant drugs have not been widely spread because they are administered in large amounts for treatment and can be expensive to produce. Therefore, raising productivity is an issue.
- Recombinant pharmaceuticals for example, introduce the target protein gene into adherent cells such as CHO cells, acclimatize to serum-free medium, and grow in suspension in recombinant CHO cells. Is produced by biosynthesis. In order to increase the productivity of the recombinant drug, it is considered preferable to culture the cells with a high cell density.
- Non-patent Document 1 a method using a microcarrier is known (Non-patent Document 1).
- this method CHO cells are adhered to microcarriers and dispersed in the culture medium. For this reason, the CHO cells can be stirred and cultured in the culture solution without being suspended.
- this method has a problem that the microcarrier is expensive and that cells exist only on the surface of the microcarrier, so that it is difficult to sufficiently increase the cell density in the culture solution.
- a gene having a gene encoding a target protein and a plasmid having a dihydrofolate reductase gene are introduced into CHO cells.
- a method is described in which the recombinant CHO cells are cultured in a suspended state by repeatedly culturing the obtained recombinant CHO cells under conditions where the cell density is lower than usual.
- the culture is repeated until the CHO cells are brought into a floating state, a long time of about 8 weeks is required until then.
- the subculture period becomes long, the labor and cost for managing and confirming the state such as gene mutation and cell alteration will increase.
- Patent Document 2 discloses that a recombinant CHO cell in which a human antithrombin gene and a dihydrofolate reductase gene are incorporated into a dihydrofolate reductase gene-deficient cell and is suspended is cultured using a hollow fiber culture apparatus.
- a method for producing human antithrombin while suspending the cells is described.
- this method has a problem in terms of cost because a device incorporating a hollow fiber is complicated and expensive.
- the hollow fiber size was increased for mass culture, medium exchange at both ends of the hollow fiber was not uniform, and the medium was likely to be non-uniform. As a result, the pH of the medium changes and stress is applied to the cells in the hollow fiber, which may reduce the productivity of the target protein.
- a culture vessel comprising an alicyclic structure-containing polymer, comprising a liquid medium and an adherent cell floating and alive in the liquid medium, and a protein utilizing the method for culturing the adherent cell It is an object to provide a production method.
- the present inventors contacted a cultured cell with an alicyclic structure-containing polymer molded product, and thus an adhesive cell that originally requires an extracellular matrix as a scaffold. Has been found to be able to survive and grow in a suspended state in a liquid medium, and the present invention has been completed.
- adherent cell culture methods (6) and (7) culture vessels, and (8) protein production methods are provided.
- a method for culturing an adherent cell wherein the adherent cell is allowed to grow in a suspended state in a liquid medium by contacting the adherent cell with an alicyclic structure-containing polymer molded product. .
- the method for culturing adherent cells according to (1) or (2), wherein the adherent cells are CHO cells.
- the adhesion type cell culture method which can be made to proliferate without making it kill even if it makes a floating state without requiring special operation, a liquid culture medium, and the said liquid culture medium in this liquid medium.
- a culture vessel using an alicyclic structure-containing polymer which contains adhering cells that are floating and surviving, and a method for producing a protein using the adhering cell culture method.
- FIG. 1 is a graph showing the number of living cells relative to the number of days elapsed when recombinant CHO cells are cultured.
- FIG. 2 is a graph showing the concentration of EPO in the medium when recombinant CHO cells are cultured for 17 days.
- FIG. 3 is a graph showing the correlation between the concentration of EPO in the culture medium and the measured value of LDH activity reflecting leakage of intracellular components when recombinant CHO cells are cultured.
- the method of the present invention is characterized in that an adhesive type cell and an alicyclic structure-containing polymer molded product are brought into contact with each other to grow the adhesive type cell in a state of being suspended in a liquid medium.
- a cell culture method is characterized in that an adhesive type cell and an alicyclic structure-containing polymer molded product are brought into contact with each other to grow the adhesive type cell in a state of being suspended in a liquid medium.
- Adhesive cells used in the present invention are not particularly limited and can be arbitrarily selected according to the purpose.
- the adherent cell may be an adherent cell itself or a cell derived from an adherent cell.
- Adhesive cells themselves are cells that can survive and proliferate by adhering to an extracellular matrix under normal culture conditions, and are also referred to as anchorage-dependent cells.
- Adherent cell-derived cells are those that do not adhere to the extracellular matrix by applying some external factor to the adherent cells, such as cells that have been cultivated and cultivated, and can survive and proliferate even in suspension. A cell that can survive and proliferate.
- adherent cells examples include genetically engineered host cells and virus-sensitive cells, such as CHO cells, VERO cells, NIH3T3 cells, HEK293 cells, etc. Among them, CHO cells are preferable.
- the adherent cells are preferably genetically modified to express a foreign gene.
- Such cells include those capable of expressing foreign genes, such as by transduction using phage or plasmid vectors.
- the foreign gene can be arbitrarily selected according to the purpose.
- EPO erythropoietin
- interferon ⁇ , ⁇ , ⁇
- G-CSF granulocyte colony stimulating factor
- interleukin granulocyte macrophage / colony stimulating factor GM-CSF
- human growth hormone genes encoding physiologically active proteins such as cytokines and hormones such as insulin, glucagon HGF, blood coagulation factor VIII, and human antibodies.
- a liquid medium is used when culturing cells.
- a medium having a pH buffering action having an osmotic pressure suitable for cells, containing nutrient components of cells, and not toxic to cells is used.
- the component exhibiting pH buffering action include tris hydrochloride, various phosphates, and various carbonates.
- the osmotic pressure of the liquid medium is usually adjusted using an aqueous solution in which the concentrations of potassium ions, sodium ions, calcium ions, glucose and the like are adjusted so as to be almost the same as the osmotic pressure of the cells.
- aqueous solution examples include physiological saline such as phosphate buffered saline, Tris buffered saline, and HEPES buffered saline; Ringer's solution such as lactated Ringer's solution, acetated Ringer's solution, and bicarbonated Ringer's solution; It is done.
- the nutrient component of the cell include amino acids, nucleic acids, vitamins, minerals and the like.
- various commercial products such as RPMI-1640, HAM, ⁇ -MEM, DMEM, EMEM, F-12, F-10, and M-199 can be used.
- additives can also be mix
- additives include inducers such as proteins, low molecular compounds having differentiation-inducing activity, minerals, metals, and vitamin components.
- Additives used include ligands, agonists and antagonists that act on receptors on the cell surface; ligands, agonists and antagonists of nuclear receptors; extracellular matrices such as collagen and fivenectin; Simulated compounds; components that act on proteins involved in intracellular signal transduction pathways; components that act on enzymes of primary or secondary metabolism in cells; affect gene expression in the nucleus or mitochondria in cells Components to be given; DNA and RNA that can be introduced into cells in combination with viral vectors and the like. These additives can be used alone or in combination of two or more.
- the cell culture conditions are not particularly limited, and can be appropriately determined according to the cells to be used and the purpose.
- the cells can be cultured using a humidified thermostat having a carbon dioxide concentration of about 5% and a constant temperature in the range of 20 ° C. to 37 ° C.
- the alicyclic structure-containing polymer molded product used in the present invention is formed by molding an alicyclic structure-containing polymer into an arbitrary shape.
- the alicyclic structure-containing polymer is a resin having an alicyclic structure in the main chain and / or side chain, and preferably contains an alicyclic structure in the main chain from the viewpoint of mechanical strength, heat resistance, and the like.
- Examples of the alicyclic structure include a saturated cyclic hydrocarbon (cycloalkane) structure and an unsaturated cyclic hydrocarbon (cycloalkene) structure. From the viewpoint of mechanical strength, heat resistance, etc., a cycloalkane structure or a cycloalkene structure. A structure is preferable, and a structure having a cycloalkane structure is most preferable.
- the number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually 4 to 30, preferably 5 to 20, and more preferably 5 to 15. When the number of carbon atoms constituting the alicyclic structure is within this range, mechanical strength, heat resistance, and moldability are highly balanced, which is preferable.
- the proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer may be appropriately selected according to the purpose of use, but is usually 30% by weight or more, preferably 50% by weight or more, more preferably 70% by weight. %. If the proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer is excessively small, the heat resistance is inferior, which is not preferable.
- the remainder other than the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer is not particularly limited and is appropriately selected according to the purpose of use.
- alicyclic structure-containing polymer examples include (1) norbornene polymer, (2) monocyclic olefin polymer, (3) cyclic conjugated diene polymer, and (4) vinyl alicyclic carbonization.
- examples thereof include hydrogen polymers and hydrides of (1) to (4).
- norbornene-based polymers and hydrides thereof are preferable from the viewpoints of heat resistance, mechanical strength, and the like.
- Norbornene-based polymer The norbornene-based polymer is obtained by polymerizing a norbornene-based monomer that is a monomer having a norbornene skeleton, and is obtained by ring-opening polymerization or by addition polymerization. Broadly divided into things.
- Examples of the ring-opening polymer obtained by ring-opening polymerization include ring-opening polymers of norbornene monomers, ring-opening polymers of norbornene monomers and other monomers capable of ring-opening copolymerization, and these A hydride etc. are mentioned.
- Examples of those obtained by addition polymerization include addition polymers of norbornene monomers and addition polymers of norbornene monomers and other monomers copolymerizable therewith.
- a ring-opening polymer hydride of a norbornene-based monomer is preferable from the viewpoint of heat resistance, mechanical strength, and the like.
- norbornene monomer examples include bicyclo [2.2.1] hept-2-ene (common name: norbornene), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl. -Bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene 5-vinyl-bicyclo [2.2.1] hept-2-ene, 5-propenylbicyclo [2.2.1] hept-2-ene, 5-methoxycarbonyl-bicyclo [2.2.1] hepta Bicyclic single units such as -2-ene, 5-cyanobicyclo [2.2.1] hept-2-ene, 5-methyl-5-methoxycarbonyl-bicyclo [2.2.1] hept-2-ene Mer; Tricyclo [4.3.0 1,6 .
- deca-3,7-diene (common name dicyclopentadiene), 2-methyldicyclopentadiene, 2,3-dimethyldicyclopentadiene, 2,3-dihydroxydicyclopentadiene, etc. Mer; Tetracyclo [4.4.0.1 2,5 . 1 7,10 ] -3-dodecene (tetracyclododecene), tetracyclo [4.4.0.1 2,5 . 1 7,10 ] -3-dodecene, 8-methyltetracyclo [4.4.0.1 2,5 . 1 7,10 ] -3-dodecene, 8-ethyltetracyclo [4.4.0.1 2,5 .
- dec-3-ene (common name methanotetrahydrofluorene: also called 1,4-methano-1,4,4a, 9a-tetrahydrofluorene) 1,4-methano-8-methyl-1,4,4a, 9a-tetrahydrofluorene, 1,4-methano-8-chloro-1,4,4a, 9a-tetrahydrofluorene, 1,4-methano-8 -Tetracyclic monomers such as bromo-1,4,4a, 9a-tetrahydrofluorene;
- monomers capable of ring-opening copolymerization with norbornene monomers include cyclohexene, cycloheptene, cyclooctene, 1,4-cyclohexadiene, 1,5-cyclooctadiene, 1,5-cyclodecadiene, And monocyclic cycloolefin monomers such as 1,5,9-cyclododecatriene and 1,5,9,13-cyclohexadecatetraene.
- These monomers may have one or more substituents. Examples of the substituent include an alkyl group, an alkylene group, an aryl group, a silyl group, an alkoxycarbonyl group, and an alkylidene group.
- ⁇ -olefin monomers having 2 to 20 carbon atoms such as ethylene, propylene, 1-butene, 1-pentene and 1-hexene; cyclobutene, cyclopentene, cyclohexene, cyclooctene, tetracyclo [9.2.1.0 2,10.
- Cycloolefin monomers such as 0 3,8 ] tetradeca-3,5,7,12-tetraene (also referred to as 3a, 5,6,7a-tetrahydro-4,7-methano-1H-indene);
- Non-conjugated diene monomers such as 4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 1,7-octadiene, and the like.
- ⁇ -olefin monomers are preferable, and ethylene is more preferable.
- These monomers may have one or more substituents. Examples of the substituent include an alkyl group, an alkylene group, an aryl group, a silyl group, an alkoxycarbonyl group, and an alkylidene group.
- a ring-opening polymer of a norbornene-based monomer, or a ring-opening polymer of a norbornene-based monomer and another monomer capable of ring-opening copolymerization with a monomer component is a known ring-opening polymerization. It can be obtained by polymerization in the presence of a catalyst.
- the ring-opening polymerization catalyst include a catalyst comprising a metal halide such as ruthenium or osmium, a nitrate or an acetylacetone compound, and a reducing agent, or a metal halide or acetylacetone such as titanium, zirconium, tungsten, or molybdenum.
- a catalyst comprising a compound and an organoaluminum compound can be used.
- the ring-opening polymer hydride of a norbornene-based monomer is usually obtained by adding a known hydrogenation catalyst containing a transition metal such as nickel or palladium to the polymerization solution of the ring-opening polymer and then adding a carbon-carbon unsaturated bond. Can be obtained by hydrogenation.
- a catalyst composed of a titanium, zirconium or vanadium compound and an organoaluminum compound can be used.
- Monocyclic cyclic olefin polymer for example, an addition polymer of a monocyclic olefin monomer such as cyclohexene, cycloheptene, or cyclooctene can be used. it can.
- Cyclic conjugated diene polymer As the cyclic conjugated diene polymer, for example, a polymer obtained by subjecting a cyclic conjugated diene monomer such as cyclopentadiene or cyclohexadiene to 1,2- or 1,4-addition polymerization, and The hydride can be used.
- Vinyl alicyclic hydrocarbon polymer examples include polymers of vinyl alicyclic hydrocarbon monomers such as vinyl cyclohexene and vinyl cyclohexane and their hydrides; And hydrides of aromatic ring portions of polymers of vinyl aromatic monomers such as ⁇ -methylstyrene.
- the vinyl alicyclic hydrocarbon polymer may be a copolymer with other monomers copolymerizable with these monomers.
- an alicyclic structure containing polymer Although there is no special restriction
- the glass transition temperature of the alicyclic structure-containing polymer may be appropriately selected depending on the purpose of use, but is usually 50 to 300 ° C, preferably 100 to 280 ° C, particularly preferably 115 to 250 ° C, and more preferably 130. ⁇ 200 ° C. When the glass transition temperature is within this range, heat resistance and molding processability are highly balanced and suitable. In the present invention, the glass transition temperature is measured based on JIS K7121.
- alicyclic structure-containing polymers can be used alone or in combination of two or more.
- a compounding agent usually used in thermoplastic resin materials for example, a soft polymer, an antioxidant, an ultraviolet absorber, a light stabilizer, a near infrared absorber, a release agent.
- Additives such as colorants such as dyes and pigments, plasticizers, antistatic agents, fluorescent brighteners, and the like can be added in amounts that are usually employed.
- the alicyclic structure-containing polymer may be mixed with another polymer other than the soft polymer (hereinafter simply referred to as “other polymer”).
- the amount of the other polymer mixed with the alicyclic structure-containing polymer is usually 200 parts by weight or less, preferably 150 parts by weight or less, more preferably 100 parts by weight with respect to 100 parts by weight of the alicyclic structure-containing polymer. It is as follows. If the proportion of various compounding agents and other polymers to be blended with the alicyclic structure-containing polymer is too high, cells will not float easily, so all are blended within the range that does not impair the properties of the alicyclic structure-containing polymer. It is preferable.
- the mixing method with the compounding agent and other polymers is not particularly limited as long as the compounding agent is sufficiently dispersed in the polymer. Moreover, there is no special restriction
- a blending method for example, a method of kneading a resin in a molten state using a mixer, a uniaxial kneader, a biaxial kneader, a roll, a Brabender, an extruder, etc., after dissolving and dispersing in a suitable solvent, Examples thereof include a method of removing the solvent by a coagulation method, a casting method, or a direct drying method.
- a biaxial kneader after kneading, it is usually extruded in a rod shape in a molten state, cut into an appropriate length with a strand cutter, and pelletized in many cases.
- the molding method of the alicyclic structure-containing polymer can be arbitrarily selected according to the shape of the alicyclic structure-containing polymer molded product used when contacting the cells.
- molding methods include injection molding, extrusion molding, cast molding, inflation molding, blow molding, vacuum molding, press molding, compression molding, rotational molding, calendar molding, and rolling molding. , Cutting molding method, spinning and the like, and these molding methods can be combined, or post-treatment such as stretching can be carried out as necessary after molding.
- a plate shape, a powder form, a granular form, a string form, a sheet form, and other shapes may be sufficient.
- the surface may be flat, may have an uneven shape, or may be a hollow molded body. Different shaped bodies can be combined into another shaped body with or without an adhesive or the like.
- culture containers such as dishes, plates, bags, tubes, scaffolds, cups, jars and fermenters; parts of culture devices such as stirring blades, stirrers, baffles, and connecting tubes; It may be a member constituting part or all of a culture instrument used for culture operation such as a pipette, a stirring element, a filter, and a cell scraper.
- the molded body when the molded body is brought into contact with the cultured cells, it is preferable to sterilize the molded body.
- heating methods such as the high-pressure steam method and dry heat method; radiation methods that irradiate radiation such as ⁇ -rays and electron beams; irradiation methods that irradiate high-frequency;
- the method can be selected from methods generally employed in the medical field, such as a gas method in which a gas is brought into contact; a filtration method using a sterilizing filter; Among these, the gas method is preferable because the change in the surface state is small.
- these molded object surfaces can also perform processes other than the objective of sterilization generally performed with respect to a culture container, such as a plasma process, a corona discharge process, an ozone process, and an ultraviolet irradiation process.
- processes other than the objective of sterilization generally performed with respect to a culture container such as a plasma process, a corona discharge process, an ozone process, and an ultraviolet irradiation process.
- the surface treatment operation is not performed, or the water contact angle on the bottom surface of the container before the surface treatment (the side in contact with the culture solution) is ⁇ 20. %, Preferably ⁇ 10% weak surface treatment.
- the water contact angle was determined by using a fully automatic contact angle meter (“LCD-400S” manufactured by Kyowa Interface Science Co., Ltd.), cutting the bottom of the dish with a circle cutter of ⁇ 30 mm, and one side centered on the sample.
- a fully automatic contact angle meter (“LCD-400S” manufactured by Kyowa Interface Science Co., Ltd.)
- any method may be adopted depending on the shape of the alicyclic structure-containing polymer molded product.
- a method of culturing cells in a medium mixed with an alicyclic structure-containing polymer molded product; a method of culturing cells in a culture vessel formed using the alicyclic structure-containing polymer; an alicyclic structure-containing polymer A method of performing a culture operation using a culture device formed using the above, and the like can be mentioned, and these can also be combined.
- the contact temperature between the cultured cell and the alicyclic structure-containing polymer molded product is not particularly limited as long as the cell can grow.
- the cells cultured for a long time by the method of the present invention and surviving in a floating state usually form a cell mass.
- a “cell mass” is a group of cells other than a single cell, and refers to a state in which two or more cells are combined into one.
- the term “surviving” means a state in which the cell undergoes metabolic activity and can proliferate. For example, when a component contained in an extracellular medium has invaded and penetrated into the cell, if the component is unnecessary for the vital activity of the cell, it can cause a life activity that can be eliminated outside the cell. Say.
- cells are in a state in which a dye that is not necessary for vital activities such as trypan blue is added to the extracellular fluid, and the dye that has entered and penetrated the cell can be excluded from the cell.
- Cells that are alive or cannot be excluded can be determined as dead cells.
- the cells in the cell mass are not killed, and if the cells are transduced cells, they have the ability to proliferate and produce proteins.
- adhesive cells can be cultured in a floating state, and therefore can be cultured at a high density. “High density” means 1.5 times or more, preferably 2 or more times the number of confluent cells cultured in a polystyrene dish.
- the culture method of the present invention can be cultured in a floating state at a high density even if it is an adherent cell, it is preferably used when producing protein in the cell.
- the protein is produced in large quantities by contacting the cell with an alicyclic structure-containing polymer molded product. Can do.
- virus particles containing the EPO gene were prepared by transducing the constructed plasmid pLXRN-EPO and the plasmid pVSV-G (Clontech) into package cells GP293T cells (Clontech).
- Lipofectamine manufactured by Invitrogen was used as a gene introduction reagent for the introduction of plasmid pLXRN-EPO into cells, and the gene introduction was performed according to the manufacturer's manual.
- the GP293T cells subjected to the gene transfer operation are cultured, the culture supernatant is removed, filtered, and 8 ⁇ g / ml polybrene (manufactured by Santacruz) is added to the culture containing virus particles retaining the EPO gene.
- a clear sample was prepared.
- the virus retaining the EPO gene The particles were infected with CHO cells. After 8 hours of incubation, the culture medium for CHO cells was changed to a culture operation for CHO cells producing recombinant EPO.
- Viral infection was confirmed by genomic PCR as follows. First, using Instagene (manufactured by BioRad), the genome was extracted from the infected CHO cells, and it was confirmed by PCR that the pLXRN-EPO sequence was introduced into the genome. Primers used for PCR were pLXRN-seq-F (5′-CGCCCTCCGTCTGAATTTT) and pLXRN-seq-R (TCCCTATGCAAAAGCGAAAC). In order to select CHO cells infected with the virus and having the EPO gene incorporated in the genome, antibiotic G418 is added to the medium, the culture is maintained, and antibiotic E418 resistant CHO cells are selected by drug selection. Producing CHO cells (hereinafter referred to as EPO producing CHO cells) were selected.
- Example 1 As an alicyclic structure-containing polymer, ZEONEX (registered trademark) 790R (manufactured by Nippon Zeon Co., Ltd., norbornene-based ring-opening polymer hydride; hereinafter simply referred to as “790R”) is used to produce a dish having a diameter of 3 cm by injection molding. Was made. Hereinafter, this dish is referred to as “790R dish”.
- EPO-producing CHO cells were seeded at 1.25 ⁇ 10 4 cells / cm 2 using a 790R dish as a culture container and Ham medium containing 10% fetal calf serum as a liquid medium, and 5% CO Culturing was performed for 17 days under conditions of 2 atmospheres and 37 ° C.
- the amount of the medium decreased due to the evaporation of water, so that the same amount of the medium as the decreased amount was added in order to maintain the amount of the medium.
- the number of viable cells was measured by the following method.
- Example 1 In Example 1, instead of using a 790R dish, a polystyrene dish [Falcon (registered trademark) dish (Becton Dickinson, model number 353001)] (hereinafter referred to as “polystyrene dish”) was used. The culture was performed in the same manner as in Example 1, and the number of viable cells was counted.
- Falcon registered trademark
- Becton Dickinson model number 353001
- EPO-producing CHO cells in a dish made from 790R were observed to be agglomerated and proliferating in a non-contact state.
- many of the living EPO-producing CHO cells are attached to the bottom surface, and the cells floating in the medium exist as a single cell, and most of them are , Was dead.
- the number of viable cells in the culture using the 790R dish is about 5 times the value on the seventh day of culture compared to the culture using the polystyrene dish.
- the dish made from 790R can re-increase the number of living cells easily by operation, such as addition of a culture medium.
- the increase in the number of viable cells was hardly observed even when the medium was added.
- Example 2 A 790R dish was used as a culture vessel, and EPO-producing CHO cells were repeatedly cultured three times. Using the medium on the 17th day of culture, the amount of active EPO was measured by ELISA (human EPO Platinum ELISA manufactured by eBioscience).
- Example 2 In Example 2, instead of the 790R dish, the culture was performed in the same manner as in Example 2 except that a polystyrene dish was used, and the amount of active EPO was measured.
- the amount of EPO produced from EPO-producing CHO cells cultured in a 790R dish is about 5 times that in a polystyrene dish corresponding to an existing culture technique. According to the present invention, it has been shown that a high concentration of EPO that cannot be obtained by the prior art can be produced.
- Example 3 A 790R dish was used as a culture vessel, and EPO-producing CHO cells were cultured. Subsequently, the activity of lactate dehydrogenase (hereinafter referred to as “LDH”), an intracellular metabolic enzyme, was measured using the culture medium, and the degree of leakage of intracellular components due to the death of EPO-producing CHO cells was examined. . In addition, LDH measurement used LDH Cytotoxicity Detection Kit (made by Takara).
- LDH lactate dehydrogenase
- Example 3 In Example 3, instead of the 790R dish, the culture was performed in the same manner as in Example 3 except that a polystyrene dish was used, and LDH measurement was performed.
- the horizontal axis represents the EPO concentration in the medium
- the vertical axis represents the LDH activity value.
- the measured values for the medium when cultured in the 790R dish are shown as circles, and the measured values for the medium when cultured in the polystyrene dish are shown as triangles. In both dishes, the amount of leaked cells increases as the EPO concentration increases, but the amount of leaked cells in the 790R dish compared to the culture in the polystyrene dish. It can be seen that there are fewer.
- the cells when a recombinant protein is produced using cells, the cells can be cultured under higher density conditions, and the target protein can be obtained at a high concentration. For this reason, the number of operations in cell culture can be reduced, and the culture scale can be further reduced, thereby reducing labor costs, costs required for the apparatus, medium, and the like.
- the target protein can be obtained at a high concentration, it is possible to reduce the trouble of concentrating easily denatured proteins and reduce the risk of denaturing such proteins.
- purifying proteins purification costs are reduced and it is economically advantageous. This reduces the risk of contamination with components that can cause side effects.
- the method of the present invention is a smooth progress in experiments for evaluating biological activity. Can contribute. As a result, development costs for pharmaceuticals and the like are suppressed, and manufacturing costs can be reduced.
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Abstract
Description
しかしながら、組み換え医薬品は、治療のために投与する量が多く、また、生産するための費用が高いことがあり、十分に普及するには至っていない。したがって、生産性を上げることが課題となっている。
しかしながら、この方法においてはマイクロキャリアが高価であるという問題や、マイクロキャリアの表面にのみ細胞が存在するため、培養液中における細胞密度を十分に高くすることが困難であるという問題があった。
しかしながら、この方法は、CHO細胞を浮遊状態にするまでに培養を繰り返すものであるため、それまでに8週間程度という長い時間が必要になる。また、継代培養期間が長くなると、遺伝子の変異や細胞の変質などの状態を管理し、確認する手間と費用が増加することとなる。
しかしながら、この方法には、ホローファイバーを組み込んだ装置が複雑で高価であるため、費用面での問題があった。また、大量培養のためにホローファイバーサイズを大きくすると、ホローファイバーの両端での培地交換が均等ではなく、培地が不均一になりやすかった。この結果、培地のpH等が変化し、ホローファイバー内の細胞にストレスがかかるため、目的のタンパク質の生産性が低下するおそれがあった。
本発明は、かかる実情に鑑みてなされたものであり、接着型細胞を特殊な操作を要さずに、浮遊状態にしても、死滅させることなく増殖させることができる接着型細胞の培養方法、液体培地と、当該液体培地中に浮遊して生存している接着型細胞とを含む、脂環構造含有重合体を用いてなる培養容器、および、前記接着型細胞の培養方法を利用したタンパク質の産生方法、を提供することを課題とする。
(1)接着型細胞と脂環構造含有重合体成形体とを接触させることにより、当該接着型細胞を液体培地中に浮遊させた状態で増殖させることを特徴とする、接着型細胞の培養方法。
(2)前記接着型細胞が、外来遺伝子を発現する遺伝子組み換えされたものである(1)に記載の接着型細胞の培養方法。
(3)前記接着型細胞がCHO細胞である(1)又は(2)記載の接着型細胞の培養方法。
(4)前記接着型細胞が、外来遺伝子を発現することのできる細胞である(1)又は(2)に記載の接着型細胞の培養方法。
(5)前記浮遊状態の接着型細胞が、細胞塊を形成したものである(1)~(4)のいずれかに記載の接着型細胞の培養方法。
(6)液体培地と、当該液体培地中に浮遊して生存している接着型細胞とを含む、脂環構造含有重合体を用いてなる培養容器。
(7)前記接着型細胞が細胞塊を形成したものである(6)に記載の培養容器。
(8)生理活性タンパク質をコードする外来遺伝子を発現することのできる組換え細胞の培養中に、当該細胞と脂環構造含有重合体成形体とを接触させることを特徴とする、当該タンパク質の産生方法。
また、接着型細胞は、外来遺伝子を発現する遺伝子組み換えされたものが好ましい。かかる細胞としては、ファージやプラスミドのベクター等を用いた形質導入などによって、外来遺伝子を発現することのできるものが挙げられる。
ここで外来遺伝子は、目的に応じて任意に選択することができる。具体的には、エリスロポエチン(以下、「EPO」という)、インターフェロン(α、β、γ)、顆粒球コロニー刺激因子G-CSF、インターロイキン、顆粒球マクロファージ・コロニー刺激因子GM-CSF、人成長ホルモン、インスリン、グルカゴンHGF、血液凝固第VIII因子、ヒト型抗体などのサイトカインやホルモンのような生理活性タンパク質をコードする遺伝子が挙げられる。
こうした組換え細胞の培養中に脂環構造含有重合体成形体を接触させると、生理活性タンパク質の生産量が増大する。
液体培地としては、通常、pH緩衝作用があり、浸透圧が細胞に好適なものであり、細胞の栄養成分を含み、かつ、細胞に対して毒性がないものが用いられる。
pH緩衝作用を示す成分としては、トリス塩酸塩、各種リン酸塩、各種炭酸塩等が挙げられる。
液体培地の浸透圧調整は、通常、細胞の浸透圧とほぼ同じになるように、カリウムイオン、ナトリウムイオン、カルシウムイオン、グルコース等の濃度を調整した水溶液を用いて行われる。かかる水溶液としては、具体的には、リン酸緩衝生理食塩水、トリス緩衝生理食塩水、HEPES緩衝生理食塩水等の生理食塩水;乳酸リンゲル液、酢酸リンゲル液、重炭酸リンゲル液等のリンゲル液;等が挙げられる。
細胞の栄養成分としては、アミノ酸、核酸、ビタミン類、ミネラル類等が挙げられる。
液体培地としては、RPMI-1640、HAM、α-MEM、DMEM、EMEM、F-12、F-10、M-199等の各種市販品を利用することができる。
用いる添加剤としては、細胞表面の受容体に作用する、リガンド、アゴニスト、アンタゴニスト;核内受容体の、リガンド、アゴニスト、アンタゴニスト;コラーゲンやファイブネクチンなどの細胞外マトリックス;細胞外マトリックスの一部分あるいは、模擬した化合物;細胞内の情報伝達経路に関わるタンパク質に作用する成分;細胞内の1次代謝または2次代謝の酵素に作用する成分;細胞内の核内またはミトコンドリア内の遺伝子の発現に影響を与える成分;ウィルスベクターなどと組み合わせて細胞内に導入することができるDNAやRNA;等が挙げられる。
これらの添加剤は一種単独で、あるいは二種以上を組み合わせて用いることができる。
例えば、二酸化炭素濃度が5%程度で、温度が20℃~37℃の範囲で一定に維持された、加湿された恒温器を用いて細胞を培養することができる。
脂環構造含有重合体は、主鎖及び/又は側鎖に脂環構造を有する樹脂であり、機械的強度、耐熱性などの観点から、主鎖に脂環構造を含有するものが好ましい。
ノルボルネン系重合体は、ノルボルネン骨格を有する単量体であるノルボルネン系単量体を重合してなるものであり、開環重合によって得られるものと、付加重合によって得られるものに大別される。
トリシクロ[4.3.01,6.12,5]デカ-3,7-ジエン(慣用名ジシクロペンタジエン)、2-メチルジシクロペンタジエン、2,3-ジメチルジシクロペンタジエン、2,3-ジヒドロキシジシクロペンタジエン等の3環式単量体;
テトラシクロ[4.4.0.12,5.17,10]-3-ドデセン(テトラシクロドデセン)、テトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-メチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-エチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-エチリデンテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8,9-ジメチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-エチル-9-メチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-エチリデン-9-メチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、8-メチル-8-カルボキシメチルテトラシクロ[4.4.0.12,5.17,10]-3-ドデセン、
7,8-ベンゾトリシクロ[4.3.0.12,5]デカ-3-エン(慣用名メタノテトラヒドロフルオレン:1,4-メタノ-1,4,4a,9a-テトラヒドロフルオレンともいう)、1,4-メタノ-8-メチル-1,4,4a,9a-テトラヒドロフルオレン、1,4-メタノ-8-クロロ-1,4,4a,9a-テトラヒドロフルオレン、1,4-メタノ-8-ブロモ-1,4,4a,9a-テトラヒドロフルオレン等の4環式単量体;等が挙げられる。
これらの単量体は、置換基を1種又は2種以上有していてもよい。置換基としては、アルキル基、アルキレン基、アリール基、シリル基、アルコキシカルボニル基、アルキリデン基等が挙げられる。
これらの中でも、ノルボルネン系単量体と付加共重合可能なその他の単量体としては、α-オレフィン系単量体が好ましく、エチレンがより好ましい。
これらの単量体は、置換基を1種又は2種以上有していてもよい。置換基としては、アルキル基、アルキレン基、アリール基、シリル基、アルコキシカルボニル基、アルキリデン基等が挙げられる。
ノルボルネン系単量体の開環重合体水素化物は、通常、上記開環重合体の重合溶液に、ニッケル、パラジウムなどの遷移金属を含む公知の水素化触媒を添加し、炭素-炭素不飽和結合を水素化することにより得ることができる。
単環の環状オレフィン系重合体としては、例えば、シクロヘキセン、シクロヘプテン、シクロオクテンなどの、単環の環状オレフィン系単量体の付加重合体を用いることができる。
(3)環状共役ジエン系重合体
環状共役ジエン系重合体としては、例えば、シクロペンタジエン、シクロヘキサジエンなどの環状共役ジエン系単量体を1,2-又は1,4-付加重合した重合体及びその水素化物などを用いることができる。
(4)ビニル脂環式炭化水素重合体
ビニル脂環式炭化水素重合体としては、例えば、ビニルシクロヘキセン、ビニルシクロヘキサンなどのビニル脂環式炭化水素系単量体の重合体及びその水素化物;スチレン、α-メチルスチレンなどのビニル芳香族系単量体の重合体の芳香環部分の水素化物;などが挙げられる。ビニル脂環式炭化水素重合体は、これらの単量体と共重合可能な他の単量体との共重合体であってもよい。
本発明においてガラス転移温度は、JIS K 7121に基づいて測定されたものである。
また、脂環構造含有重合体には、熱可塑性樹脂材料で通常用いられている配合剤、例えば、軟質重合体、酸化防止剤、紫外線吸収剤、光安定剤、近赤外線吸収剤、離型剤、染料や顔料などの着色剤、可塑剤、帯電防止剤、蛍光増白剤などの配合剤を、通常採用される量、添加することができる。
また、脂環構造含有重合体には、軟質重合体以外のその他の重合体(以下、単に「その他の重合体」という)を混合しても良い。脂環構造含有重合体に混合されるその他の重合体の量は、脂環構造含有重合体100重量部に対して、通常200重量部以下、好ましくは150重量部以下、より好ましくは100重量部以下である。
脂環構造含有重合体に対して配合する各種配合剤やその他の重合体の割合が多すぎると細胞が浮遊し難くなるため、いずれも脂環構造含有重合体の性質を損なわない範囲で配合することが好ましい。
配合剤やその他の重合体との混合方法は、ポリマー中に配合剤が十分に分散する方法であれば、特に限定されない。また、配合の順番に格別な制限はない。配合方法としては、例えば、ミキサー、一軸混練機、二軸混練機、ロール、ブラベンダー、押出機などを用いて樹脂を溶融状態で混練する方法、適当な溶剤に溶解して分散させた後、凝固法、キャスト法、又は直接乾燥法により溶剤を除去する方法などが挙げられる。
二軸混練機を用いる場合、混練後は、通常は溶融状態で棒状に押出し、ストランドカッターで適当な長さに切り、ペレット化して用いられることが多い。
また、細胞と接触することができる限りにおいて、ディッシュ、プレート、バッグ、チューブ、スキャホールド、カップ、ジャー・ファーメンターなどの培養容器;攪拌翼、攪拌子、バッフル、連結チューブなど培養装置の部品;ピペット、攪拌素子、フィルタ、セルスクレイパーなどの培養操作に用いる培養器具;等の一部又は全部を構成する部材であってもよい。
滅菌処理の方法に格別な制限はなく、高圧蒸気法や乾熱法などの加熱法;γ線や電子線などの放射線を照射する放射線法や高周波を照射する照射法;酸化エチレンガス(EOG)などのガスを接触させるガス法;滅菌フィルタを用いる濾過法;など、医療分野で一般的に採用される方法から、成形体の形状や用いる細胞に応じて、選択することができる。なかでも、表面状態の変化が少ないことから、ガス法が好ましい。
また、これらの成形体表面は、プラズマ処理、コロナ放電処理、オゾン処理、紫外線照射処理など培養容器に対して一般的に施す、滅菌目的以外の処理を行うこともできる。ただし、これらの表面処理操作を施すことにより発生する費用を抑えることができることや、表面処理に伴う形成体表面の部分分解により清浄性が損なわれるおそれがあること、細胞の浮遊化能が低下するおそれがあることなどから、これらの表面処理操作を行わない、又は表面処理前の容器底面(培養液に接する側)の水接触角に対して、使用時の同底面の水接触角が±20%、好ましくは±10%の弱い表面処理しかされていないことが好ましい。ここで、水接触角は、全自動接触角計(協和界面科学社製「LCD-400S」)を用い、ディッシュ底面をΦ30mmのサークルカッターで切り取って試料の中心と、そこを中央とする1辺20mmの正方形の頂点4か所、計5か所を測定点とし、液滴の半径rと高さhを求め、tanθ1=h/r、θ=2arctan(h/r)で求められるθである(θ/2法)。
尚、細胞には、情報伝達能があるため、培養中の全ての培養細胞が脂環構造含有重合体成形体に接触する必要はなく、また、培養期間全体に渡って両者が接触している必要もない。但し、接触による効果は経時的に低下するため、接触時間は長い方が好ましい。
培養細胞と、脂環構造含有重合体成形体との接触温度は細胞が増殖できる温度であれば特に制限されない。
本発明において細胞が「生存している」とは、細胞内で代謝活動を行い、細胞増殖が可能な状態をいう。例えば、細胞外の培地中に含まれる成分が細胞内部に侵入・浸透してきた場合に、その成分が細胞の生命活動に不要であれば、細胞外部に排除できる生命活動を起こすことが出来る状態をいう。細胞が生存しているかどうかは、実験的には、トリパンブルーなどの生命活動に不要な色素を細胞外の液に添加し、細胞内に侵入・浸透した色素を細胞外に排除できる状態の細胞が生存している細胞、排除できない細胞は死滅細胞として判定することができる。
本発明の方法においては、細胞塊中の細胞も死滅はせず、細胞が形質導入された細胞であれば、増殖し、かつタンパク質を産生する能力を有している。
このように、本発明の方法においては、接着型細胞であっても、浮遊状態で培養することが可能であるため、高い密度で培養することができる。
「高い密度」とは、ポリスチレン製ディッシュで培養した接着細胞のコンフルエントの細胞数の1.5倍以上、望ましくは、2倍以上のことをいう。
例えば、生理活性タンパク質をコードする外来遺伝子を発現することのできる組換え細胞の培養中に、当該細胞と脂環式構造含有重合体成形体とを接触させることにより、タンパク質を大量に産生させることができる。
〔製造例1〕組み換えEPO産生CHO細胞の作製
抗生物質G418への耐性遺伝子を内包するベクターpLXRN(Chlontech社製)の発現遺伝子の挿入サイトに、EPO遺伝子配列を挿入してプラスミドpLXRN-EPOを構築した。構築したプラスミドの中のEPO遺伝子は、その塩基配列解析を行うことにより確認した。
次に、構築したプラスミドpLXRN-EPOとプラスミドpVSV-G(Clontech社製)を、パッケージ細胞であるGP293T細胞(Clontech社製)に形質導入することにより、EPO遺伝子を含有するウイルス粒子を調製した。
なお、細胞へのプラスミドpLXRN-EPOの導入操作のための遺伝子導入試薬として、Lipofectamine(invitorogen社製)を用い、遺伝子導入操作は、メーカーのマニュアルに従った。
続いて、あらかじめ培養したCHO細胞試料の培養液を除いて、上記のEPO遺伝子を保持したウイルス粒子を含む培養上清試料を添加して、8時間培養維持することにより、EPO遺伝子を保持したウイルス粒子をCHO細胞に感染させた。
8時間のインキュベーションの後に、CHO細胞の培養培地に交換を行い、組み換えEPOを産生するCHO細胞の培養操作を行った。
ウイルスが感染し、ゲノムにEPO遺伝子が組み込まれたCHO細胞を選抜するため、抗生物質G418を培地に添加し、培養維持して、抗生物質G418耐性のCHO細胞を薬剤選択することにより、組み換えEPO産生CHO細胞(以下、EPO産生CHO細胞という。)を選抜した。
脂環構造含有重合体として、ゼオネックス(登録商標)790R(日本ゼオン社製、ノルボルネン系開環重合体水素化物;以下、単に「790R」という)を用いて、射出成形法により、直径3cmのディッシュを作製した。以下、このディッシュを「790R製ディッシュ」という。
培養容器として790R製ディッシュを使用し、液体培地として10%牛胎児血清を含むHam培地を使用して、EPO産生CHO細胞を1.25×104cells/cm2で播種して、5%CO2雰囲気37℃の条件で17日間培養を行った。培養途中11日時点で、水の蒸散により培地液量が減少したので、培地液量を保持するために、減少した液量と同量の培地を添加した。
培養から2日目、7日目、10日目、14日目及び17日目に、以下の方法により生細胞数を計測した。
(細胞数の計測)
浮遊状態にある細胞については、培養上清を取り出して遠心処理により沈殿回収した細胞をトリパンブルー染色して生細胞と死滅細胞を区別して、生細胞数を計測した。
一方、ディッシュ底面に接着している細胞は、生理食塩水で洗浄後、トリプシン処理によりディッシュから細胞を剥離した後、これらをトリパンブルー染色して生細胞と死細胞を区別して、生細胞数を計測した。
実施例1において、790R製ディッシュに代えて、ポリスチレン製ディッシュ〔ファルコン(登録商標)ディッシュ(ベクトンデッキンソン社製、型番353001)〕(以下、「ポリスチレン製ディッシュ」と称する)を使用したことを除き、実施例1と同様にして培養を行い、生細胞数を計測した。
図1に示すように、790R製ディッシュを用いた培養における生細胞数は、ポリスチレン製ディッシュを用いた培養のものに比較して、培養7日目で、約5倍の値である。
また、培養10日目では、790R製ディッシュとポリスチレン製ディッシュともに、生細胞数が減少したが、11日目での培地追加により、790R製ディッシュでの生細胞は、再び増加している。このように、790R製ディッシュは、培地追加などの操作により、容易に、生細胞数を再増加させ得るものである。
一方、ポリスチレン製ディッシュでは、培地追加によっても、生細胞数の増加はほとんど観察されなかった。
培養容器として790R製ディッシュを使用し、EPO産生CHO細胞を3回、繰り返し培養した。培養17日目における培地を用いて、ELISA法(eBioscience社製のhuman EPO Platinum ELISA)により、活性型EPO量の測定を行った。
実施例2において、790R製ディッシュに代えて、ポリスチレン製ディッシュを使用したことを除き、実施例2と同様にして培養を行い、活性型EPO量の測定を行った。
培養容器として790R製ディッシュを使用し、EPO産生CHO細胞を培養した。次いで、その培養培地を用いて、細胞内の代謝酵素である乳酸デヒドロゲナーゼ(以下、「LDH」という)の活性を測定し、EPO産生CHO細胞の死滅による細胞内の成分の漏洩の程度を調べた。なお、LDH測定は、LDH Cytotoxicity Detection Kit(Takara社製)を用いた。
実施例3において、790R製ディッシュに代えて、ポリスチレン製ディッシュを使用したことを除き、実施例3と同様にして培養を行い、LDH測定を行った。
どちらのディッシュを用いた場合も、EPO濃度が高くなるにつれて、細胞の漏洩成分量が増加するが、ポリスチレン製ディッシュでの培養に比較して、790R製ディッシュでの培養では、細胞の漏洩成分量がより少ないことが分かる。
また、目的のタンパク質が高濃度で得られるため、変性しやすいタンパク質を濃縮する手間が軽減されるとともに、そのようなタンパク質が変性するリスクを軽減できる。
さらに、細胞内からの漏洩物が少ないことから、タンパク質を精製する場合において、精製コストが軽減され、経済的に有利であることに加え、より高純度のタンパク質の精製が期待されるので、発熱などの副作用を引き起こす可能性のある成分の混入のリスクが軽減される。
医薬品開発研究などのバイオテクノロジー研究においては、少量のスケールで、より高濃度で高純度の組み換えタンパク質を得ることが期待されるので、本発明の方法は、生理活性評価の実験などの円滑な進捗に貢献し得る。その結果、医薬品などの開発コストが抑制されるとともに、製造コストも低減できる。
Claims (8)
- 接着型細胞と脂環構造含有重合体成形体とを接触させることにより、当該接着型細胞を液体培地中に浮遊させた状態で増殖させることを特徴とする、接着型細胞の培養方法。
- 前記接着型細胞が、外来遺伝子を発現する遺伝子組み換えされたものである請求項1に記載の接着型細胞の培養方法。
- 前記接着型細胞がCHO細胞である請求項1又は2記載の接着型細胞の培養方法。
- 前記接着型細胞が、外来遺伝子を発現することのできる細胞である請求項1又は2記載の接着型細胞の培養方法。
- 前記浮遊状態の接着型細胞が、細胞塊を形成したものである請求項1~4のいずれかに記載の接着型細胞の培養方法。
- 液体培地と、当該液体培地中に浮遊して生存している接着型細胞とを含む、脂環構造含有重合体を用いてなる培養容器。
- 前記接着型細胞が細胞塊を形成したものである請求項5に記載の培養容器。
- 生理活性タンパク質をコードする外来遺伝子を発現することのできる組換え細胞の培養中に、当該細胞と脂環構造含有重合体成形体とを接触させることを特徴とする、当該タンパク質の産生方法。
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| CN201580031475.XA CN106459905A (zh) | 2014-06-26 | 2015-06-24 | 粘附型细胞的培养方法、培养容器和蛋白质的产生方法 |
| US15/318,955 US20170130203A1 (en) | 2014-06-26 | 2015-06-24 | Method for culturing adhesive cells, culture vessel, and method for producing protein |
| EP15811669.9A EP3162892A4 (en) | 2014-06-26 | 2015-06-24 | Method for culturing adhesive cells, culture vessel, and method for producing protein |
| JP2015551925A JP5867667B1 (ja) | 2014-06-26 | 2015-06-24 | 接着型細胞の培養方法、培養容器およびタンパク質の産生方法 |
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| WO2017010533A1 (ja) * | 2015-07-16 | 2017-01-19 | 日本ゼオン株式会社 | 細胞外マトリックス産生促進方法、細胞の培養方法、及び細胞外マトリックス産生促進剤 |
| WO2017104821A1 (ja) * | 2015-12-18 | 2017-06-22 | 日本ゼオン株式会社 | 浮遊培養馴化接着型細胞の調製方法、接着型上皮細胞の上皮間葉転換誘導方法、及びそれらの利用 |
| WO2017115706A1 (ja) * | 2015-12-28 | 2017-07-06 | 日本ゼオン株式会社 | 培養細胞の分化促進方法及び培養細胞分化促進剤 |
| WO2017188061A1 (ja) * | 2016-04-25 | 2017-11-02 | 株式会社バイオ未来工房 | 細胞用保存容器、及び細胞の保存方法 |
| WO2018117242A1 (ja) | 2016-12-22 | 2018-06-28 | 日本ゼオン株式会社 | オリゴペプチドの探索方法、オリゴペプチド、修飾ペプチド、及び免疫測定方法 |
| WO2022163653A1 (ja) * | 2021-01-29 | 2022-08-04 | 日本ゼオン株式会社 | ベクター、ベクターが導入された組み換え脊椎動物細胞およびその製造方法、並びに、標的タンパク質の製造方法 |
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| Publication number | Publication date |
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| EP3162892A1 (en) | 2017-05-03 |
| KR20170020486A (ko) | 2017-02-22 |
| CN106459905A (zh) | 2017-02-22 |
| US20170130203A1 (en) | 2017-05-11 |
| JP5867667B1 (ja) | 2016-02-24 |
| JPWO2015199119A1 (ja) | 2017-04-20 |
| KR102470046B1 (ko) | 2022-11-22 |
| EP3162892A4 (en) | 2018-02-21 |
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