WO2012091124A1 - 動物細胞の培養方法 - Google Patents
動物細胞の培養方法 Download PDFInfo
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- WO2012091124A1 WO2012091124A1 PCT/JP2011/080478 JP2011080478W WO2012091124A1 WO 2012091124 A1 WO2012091124 A1 WO 2012091124A1 JP 2011080478 W JP2011080478 W JP 2011080478W WO 2012091124 A1 WO2012091124 A1 WO 2012091124A1
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- C07K16/24—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against cytokines, lymphokines or interferons
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- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2866—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for cytokines, lymphokines, interferons
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- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
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- C12N2523/00—Culture process characterised by temperature
Definitions
- the present invention relates to a culture method for suppressing heterogeneity of a desired protein when animal cells producing the desired protein are cultured to produce the protein, and the desired protein is produced using the method. On how to do. Specifically, the present invention relates to a method for producing a protein by culturing cells that produce a desired protein. After culturing at a normal culture temperature for a certain period of time, the culture temperature is lowered to 25 ° C. to 35 ° C. The present invention relates to a method characterized by continuing the culture.
- An object of the present invention is to suppress the heterogeneity of a desired protein that occurs when an animal cell that produces the desired protein is cultured to produce the protein.
- the present inventors have found that desired protein heterogeneity can be suppressed by manipulating the temperature conditions of cell culture. Specifically, after culturing at normal culture temperature for a certain period of time, it was found that the heterogeneity of the desired protein can be suppressed by lowering the culture temperature and continuing the culture. Based on this, the present invention has been completed.
- the present invention provides the following.
- (1) A method for suppressing the generation of a heterogeneity component of a desired protein when producing the desired protein by culturing animal cells that produce the desired protein and producing the protein.
- a method comprising culturing at a normal culture temperature (36 ° C. to 38 ° C.) for a certain period of time and then continuing the culture by lowering the culture temperature to 25 ° C. to 35 ° C.
- the animal cell is a cell having a trait that the productivity per cell of the desired protein does not increase or the productivity decreases at a temperature lower than the normal culture temperature (36 ° C. to 38 ° C.).
- a method for producing a pharmaceutical comprising the protein produced by the above method as an active ingredient.
- the desired protein is an anti-glypican 3 antibody or an anti-IL-31RA antibody.
- the present invention can be used very advantageously for the production of bioactive peptides or proteins.
- it is possible to suppress heterogeneity of a desired protein that occurs when an animal cell that produces the desired protein is cultured to produce the protein. Therefore, there is a high possibility that a more uniform protein can be obtained, the isolation / purification process is simplified, and this is advantageous for industrial production. Specifically, for example, it can greatly contribute to a large supply of pharmaceutical antibodies and the like.
- Example 1 regarding the acidic peak suppression of the antibody by a temperature shift is shown.
- Example 2 regarding the acidic peak suppression of the antibody by a temperature shift is shown.
- Example 3 regarding the acidic peak suppression of the antibody by a temperature shift is shown.
- the method of the present invention is characterized in that it suppresses the generation of a heterogeneity component of a desired protein that occurs when cells that produce the desired protein are cultured to produce the protein. Specifically, in a method for producing a protein by culturing cells that produce a desired protein, after culturing at a normal culture temperature for a certain period, the culture temperature is lowered to 25 ° C. to 35 ° C. and the culture is continued. It is characterized by doing.
- animal cells have a trait that the productivity per cell of the desired protein does not increase or decreases at a temperature lower than the normal culture temperature (36 ° C. to 38 ° C.). It is a cell.
- shifting the culture temperature culturing by lowering the culture temperature after culturing at a normal culture temperature for a certain period of time.
- the normal culture temperature is generally 36 ° C. to 38 ° C., which is a temperature suitable for cell growth of cells derived from a thermostatic animal, and 37 ° C. is the most common.
- the lowered culture temperature is referred to as “shift temperature”.
- the shift temperature is lower than the normal culture temperature and lower than 37 ° C., for example, 25 ° C. to 35 ° C., preferably 30 ° C. to 35 ° C., more preferably 32 ° C. to 35 ° C.
- the inventors have found that the effects of temperature shifts on CHO cell lines producing recombinant humanized antibodies, cell density, cell viability, changes in media components, antibody protein concentrations produced, and heterogeneous components of antibodies The change of was examined.
- inhibiting the generation of a desired protein heterogeneity component includes inhibiting charge heterogeneity.
- Charge heterogeneity refers to components with a higher pI (basic peak) and components with a lower (acidic peak) than the main component due to deamidation, amino acid substitution / deletion, and sugar chain structure differences. This is a phenomenon in which the charge of the protein becomes non-uniform due to the generation.
- inhibiting the production of a desired protein heterogeneity component includes inhibiting the formation of an acidic peak.
- Protein acidic peak refers to a component having a pI lower than that of the main component, and is formed by a difference in deamidation or sugar chain structure.
- the acidic peak is measured by ion exchange chromatography and calculated as a percentage (%) with respect to the main component.
- the timing of the temperature shift varies depending on the animal cells used and the culture conditions. Experiments are performed on the animal cells to be used, and optimization is performed using the balance between the productivity of the target protein and the generation of heterogeneity components as an index.
- the batch culture method is a culture method in which a small amount of seed culture solution is added to a medium, and cells are grown without newly adding a medium or discharging the culture solution during the culture.
- the continuous culture method is a culture method in which a medium is continuously added and continuously discharged during culture.
- the continuous method includes perfusion culture. Since the fed-batch culture method is intermediate between the batch culture method and the continuous culture method, it is also called a semi-batch culture method, and the medium is added continuously or sequentially during the culture. In this culture method, the continuous culture solution is not discharged.
- any culture method may be used, but a fed-batch culture method or a continuous culture method is preferably used, and a fed-batch culture method is particularly preferably used.
- the medium added during fed-batch culture does not have to be the same as the medium already used for culture (hereinafter referred to as initial medium).
- initial medium the medium already used for culture
- only specific components may be added.
- the composition of the fed-batch medium is prepared so that components that have been consumed during the cultivation are supplemented. For example, glucose, the primary energy source for animal cell growth, can be supplemented by fed-batch.
- the timing of the temperature shift is determined by the balance between the expression level of the target protein and the generation of an acidic peak. Specifically, by performing the experiment shown in Example 2, the optimum temperature shift timing can be known. It is preferable to start the temperature shift at a time when the cells become sufficiently dense, but the cell density that can be achieved depends on the cells used and the culture conditions, so it cannot be limited to a narrow range. It is about 10 6 cells / mL to 10 8 cells / mL.
- each component used in a cell (preferably animal cell) culture medium can be appropriately used.
- these include amino acids, vitamins, lipid factors, Contains energy source, osmotic pressure regulator, iron source, pH buffer.
- trace metal elements, surfactants, growth cofactors, nucleosides and the like may be added.
- components in the culture solution include, for example, L-alanine, L-arginine, L-asparagine, L-aspartic acid, L-glutamine, L-glutamic acid, glycine, L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, L-ornithine, L-phenylalanine, L-proline, L-threonine, L-tryptophan, L-valine, etc., preferably L-alanine, L-arginine, L-asparagine , L-aspartic acid, L-glutamine, L-glutamic acid, glycine, L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, L-phenylalanine, L-proline, L-threonine, L- Amino acids such as tryptophan and L-valine;
- Lipid factors such as choline chloride, choline tartrate, linoleic acid, oleic acid, cholesterol, preferably choline chloride; energy sources such as glucose, galactose, mannose, fructose, preferably glucose; sodium chloride, potassium chloride, potassium nitrate Etc., preferably an osmotic pressure regulator such as sodium chloride; EDTA iron, iron citrate, ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, ferric nitrate, etc., preferably ferric chloride Iron sources such as ferric iron, EDTA iron, iron citrate; charcoal Sodium hydrogencarbonate, calcium chloride, sodium dihydrogen phosphate, HEPES, MOPS, etc., preferably pH buffering agents such as sodium hydrogen carbonate can be exemplified.
- trace metal elements such as copper sulfate, manganese sulfate, zinc sulfate, magnesium sulfate, nickel chloride, tin chloride, magnesium chloride, sodium silicate and the like, preferably copper sulfate, zinc sulfate, magnesium sulfate and the like; Surfactants such as Tween80 and Pluronic F68; and recombinant insulin, recombinant IGF, recombinant EGF, recombinant FGF, recombinant PDGF, recombinant TGF- ⁇ , ethanolamine hydrochloride, selenite Sodium, retinoic acid, putrescine hydrochloride, etc., preferably sodium selenite, ethanolamine hydrochloride, recombinant IGF, putrescine hydrochloride and other growth cofactors; deoxyadenosine, deoxycytidine, deoxyguanosine, a
- the content of other ingredients in the culture medium is 0.05-1500 mg / L for amino acids, 0.001-10 mg / L for vitamins, 0-200 mg / L for lipid factors, 1-20 g / L for energy sources, and osmotic pressure.
- Regulator is 0.1-10000mg / L
- iron source is 0.1-500mg / L
- pH buffer is 1-10000mg / L
- trace element is 0.00001-200mg / L
- surfactant is 0-5000mg / L
- growth aid The factors are suitably in the range of 0.05 to 10,000 ⁇ g / L and nucleoside in the range of 0.001 to 50 mg / L, and can be appropriately determined depending on the type of cells to be cultured, the type of desired protein, and the like.
- the pH of the culture solution varies depending on the cells to be cultured, but generally pH 6.8 to 7.6 is appropriate, and in many cases pH 7.0 to 7.4 is appropriate.
- cells can be cultured using a completely synthetic medium in which the above-described components are dissolved.
- a conventionally known animal cell culture medium can be used as a basal medium, and other components can be supplemented as necessary.
- basal media include D-MEM (Dulbecco's Modified EagleumMedium), D-MEM / F-12 1: 1 Mixture (Dulbecco's Modified Eagle Medium: Nutrient Mixture F-12), RPMI1640, CHO-S-SFMII (Invitrogen), CHO-SF (Sigma-Aldrich), EX-CELL 301 (JRH biosciences), CD-CHO (Invitrogen), IS CHO-V (Irvine Scientific), PF-ACF-CHO (Sigma-Aldrich) etc.
- D-MEM Dulbecco's Modified EagleumMedium
- D-MEM / F-12 1 1 Mixture (Dulbecco's Modified Eagle Medium: Nutrient Mixture F-12),
- a preferred embodiment of the method of the present invention is a cultured animal cell such as COS cell or CHO cell into which a gene encoding a desired protein has been incorporated by genetic engineering manipulation, or mouse-human, mouse-mouse, mouse producing antibody.
- a method for suppressing the generation of a heterogeneity component of a desired protein when culturing fused cells typified by a hybridoma such as a rat.
- the method of the present invention can also be used when an animal cell is cultured to obtain a natural protein produced by the animal cell.
- the animal cultured cells used for expressing the desired protein in the present invention are not particularly limited, but mammalian cells are preferred.
- the mammalian cells may be cells derived from any mammal such as humans, primates such as chimpanzees, rodents such as mice, rats and hamsters, but CHO cells, COS cells, 3T3 cells, myeloma cells, BHK cells, Commonly used animal cultured cells such as HeLa cells and Vero cells are preferred, and CHO cells are particularly preferred for mass expression purposes.
- dhfr-CHO cells Proc. Natl. Acad. Sci.
- DG44 strain As the above CHO cells, DG44 strain, DXB-11 strain, K-1, and CHO-S are particularly preferable, and DG44 strain and DXB-11 strain are particularly preferable.
- the vector can be introduced into the host cell by, for example, a calcium phosphate method, a DEAE dextran method, a method using the cationic ribosome DOTAP (Boehringer Mannheim), an electroporation method, a lipofection method, or the like.
- Particularly preferred animal cells in the present invention are CHO cells into which a gene encoding a desired protein has been introduced.
- the desired protein is not particularly limited, and antibodies such as natural antibodies, antibody fragments, low molecular weight antibodies, chimeric antibodies, humanized antibodies, Bi-specific antibodies (for example, anti-IL-6 receptor antibodies, anti-IL-6 antibodies, Anti-glypican-3 antibody, anti-CD3 antibody, anti-CD20 antibody, anti-GPIIb / IIIa antibody, anti-TNF antibody, anti-CD25 antibody, anti-EGFR antibody, anti-Her2 / neu antibody, anti-RSV antibody, anti-CD33 antibody, anti-CD52 antibody, Anti-IgE antibody, anti-CD11a antibody, anti-VEGF antibody, anti-VLA4 antibody, anti-NR10 (IL-31RA) antibody, anti-ganglioside GM3 antibody, anti-TPO receptor agonist antibody, coagulation factor VIII substitute antibody, anti-IL-31 receptor antibody , Anti-HLA antibody, anti-AXL antibody,
- Antibodies include not only monoclonal antibodies derived from animals such as humans, mice, rats, hamsters, rabbits, monkeys, but also genetically modified antibodies such as chimeric antibodies, humanized antibodies, and bispecific antibodies.
- the immunoglobulin class of the antibody is not particularly limited, and may be any class such as IgG1, IgG2, IgG3, and IgG4, IgA, IgD, IgE, IgM, etc. However, when used as a pharmaceutical, IgG and IgM Is preferred.
- the antibodies of the present invention are not only whole antibodies, but also antibody fragments such as Fv, Fab, F (ab) 2 and the like, and monovalent or bivalent or more obtained by binding antibody variable regions with a linker such as a peptide linker. Also included are low molecular weight antibodies of single chain Fv (scFv, sc (Fv) 2 etc.).
- the present invention provides a method for suppressing the production of an acidic peak of an antibody when culturing a CHO cell into which a gene encoding the antibody has been introduced for the purpose of producing an antibody, wherein It is characterized by culturing at a normal culture temperature from 3 days to 7 days after the day, and then lowering the culture temperature. That is, for example, from the start of culture to the third day, from the start of culture to the fourth day, from the start of culture to the fifth day, from the start of culture to the sixth day, or from the start of culture to the seventh day.
- the temperature shift is started after culturing at the culture temperature, and the culture is continued at the shift temperature thereafter.
- the period from the temperature shift to low temperature to the end of the culture is generally 1 to 50 days, preferably 5 to 15 days, and more preferably 7 to 12 days. is there.
- culture conditions vary depending on the type of cells used, suitable conditions can be determined as appropriate.
- the cells may be cultured for 1-50 days, more preferably 1-14 days, usually in an atmosphere with a CO 2 concentration in the gas phase of 0-40%, preferably 2-10%.
- fermenter tank culture apparatus for example, fermenter tank culture apparatus, air lift culture apparatus, culture flask culture apparatus, spinner flask culture apparatus, microcarrier culture apparatus, fluidized bed culture Culture can be performed using an apparatus, a holofiber type culture apparatus, a roller bottle type culture apparatus, a filled tank type culture apparatus, or the like.
- suitable culture conditions are selected such that the production of the heterogeneity component of the target protein produced by the animal cells is suppressed and the productivity is less reduced.
- the present inventors have confirmed that the amount of antibody production per cell is slightly reduced by the temperature shift, but by adjusting the shift temperature and timing, the expression level of the target protein is reduced. It is possible to minimize and suppress the formation of heterogeneity components.
- the production of protein in animal cells may be obtained by simply culturing the protein, or may require special operations, but these operations or conditions may be appropriately determined depending on the animal cells to be cultured.
- culturing is carried out under the conditions described above.
- the desired protein can be obtained in the medium in about 1-50 days, preferably 5-21 days, more preferably about 7-14 days.
- the desired protein can be obtained by separation and purification.
- Proteins secreted from animal cultured cells into the medium can be recovered from the culture medium by conventional methods.
- proteins can be recovered from cell lysates of host cells by conventional methods.
- the desired protein is collected by removing the cells and cell debris by centrifuging the cell culture solution or cell lysate and then applying general protein isolation and purification techniques.
- Salting out method for example, ammonium sulfate fractionation method
- alcohol precipitation method for example, ethanol precipitation
- PEG method electrophoresis method
- ion exchange chromatography ultracentrifugation method
- gel filtration method hydrophobic chromatography
- affinity Chromatography affinity Chromatography is used.
- the desired protein is an antibody
- protein A chromatography is preferably used, but is not limited thereto.
- antibodies can be divided into immunoglobulin classes or fractionated by antigen binding.
- recombinant antibodies naturally antibodies, antibody fragments, low molecular weight antibodies, chimeric antibodies, humanized antibodies, bispecific antibodies, etc.
- recombinant proteins granulocyte colony stimulating factor (G-CSF), granulocyte macrophages
- G-CSF granulocyte colony stimulating factor
- GM-CSF Colony-stimulating factor
- erythropoietin interferon
- interleukins such as IL-1 and IL-6
- t-PA urokinase
- serum albumin serum albumin
- blood coagulation factor etc.
- protein or polypeptide produced by the method of the present invention has a pharmaceutically usable biological activity
- such protein or polypeptide is pharmaceutically acceptable.
- a pharmaceutical product can be produced by mixing with a carrier or an additive to prepare a pharmaceutical preparation.
- the protein of the present invention and a pharmaceutical comprising the protein of the present invention as an active ingredient are also included in the scope of the present invention.
- Examples of pharmaceutically acceptable carriers and additives include water, pharmaceutically acceptable organic solvents, collagen, polyvinyl alcohol, polyvinyl pyrrolidone, carboxyvinyl polymer, sodium carboxymethylcellulose, sodium polyacrylate, sodium alginate, water soluble Dextran, sodium carboxymethyl starch, pectin, methylcellulose, ethylcellulose, xanthan gum, gum arabic, casein, agar, polyethylene glycol, diglycerin, glycerin, propylene glycol, petrolatum, paraffin, stearyl alcohol, stearic acid, human serum albumin (HSA) , Mannitol, sorbitol, lactose, surfactants acceptable as pharmaceutical additives, and the like.
- water pharmaceutically acceptable organic solvents
- collagen collagen
- polyvinyl alcohol polyvinyl pyrrolidone
- carboxyvinyl polymer sodium carboxymethylcellulose, sodium polyacrylate, sodium alginate, water soluble Dextran, sodium carboxy
- the purified polypeptide when used as an injectable preparation, is dissolved in a solvent such as physiological saline, buffer solution, glucose solution, etc., and an adsorption inhibitor such as Tween 80, Tween 20, gelatin, human serum albumin, etc. Can be used. Alternatively, it may be lyophilized to obtain a dosage form that is reconstituted before use, and as an excipient for lyophilization, for example, sugar alcohols or saccharides such as mannitol and glucose are used. be able to.
- a solvent such as physiological saline, buffer solution, glucose solution, etc.
- an adsorption inhibitor such as Tween 80, Tween 20, gelatin, human serum albumin, etc.
- Tween 80, Tween 20, gelatin, human serum albumin, etc. can be used.
- it may be lyophilized to obtain a dosage form that is reconstituted before use, and as an excipient for lyophilization, for example, sugar alcohols or saccharides such
- the effective dose of the polypeptide is appropriately selected depending on the type of polypeptide, the type of disease to be treated or prevented, the age of the patient, the severity of the disease, and the like.
- the protein of the present invention is an antibody such as an anti-glypican antibody
- its effective dose is selected in the range of 0.001 mg to 1000 mg per kg body weight.
- a dosage of 0.01 to 100,000 mg / body per patient can be selected.
- the pharmaceutical administration method of the present invention can be administered either orally or parenterally, but is preferably parenteral administration.
- parenteral administration for example, intravenous injection, intramuscular injection, intraperitoneal injection
- injection for example, intravenous injection, intramuscular injection, intraperitoneal injection
- Systemic or local administration by subcutaneous injection nasal administration, pulmonary administration, transdermal administration, and the like.
- Example 1 Acid peak suppression of antibody by temperature shift (examination of shift temperature)
- Initial culture medium A plant-derived hydrolyzate was added to a commercially available serum-free medium for animal cell culture, dissolved and then sterilized by filtration.
- Feeding medium Glucose was added to a commercially available serum-free medium for animal cell culture, dissolved and then sterilized by filtration.
- Cells Recombinant anti-glypican-3 (GPC-3) humanized antibody humanized with the method described in Example 24 of WO2006 / 006693 and humanized with the L chain modified by the method of Example 25
- CHO cell line producing the GC33 antibody (antibody class IgG1) DXB-11 strain; G. Urlaub et al, Proc.
- the initial culture medium was added to a 1 L jar type cell culture device (5 units), and the above CHO cell line was seeded at 2 ⁇ 10 5 cells / mL, and the culture was started at 37 ° C.
- a temperature shift was performed from the fifth day of culture.
- the shift temperatures were 32 ° C., 33 ° C., 34 ° C., 35 ° C., and 37 ° C. (no temperature shift) in order from the culture tank 1, and the subsequent culture was performed at shifted temperatures.
- DO was controlled at 40% and pH at 6.9.
- the feeding medium was added at a constant flow rate from the third day of culture.
- Viable cell count and viability were measured by trypan blue staining. 1 mL of the cell suspension was set in the automatic cell measuring device Cedex, and the number of viable and dead cells was measured. Viable cell count and live cell density (10 5 cells / mL) and survival rate (%) were calculated automatically using data analysis software Cedex Loader (Innovatis, ver. 1.51 or later). The glucose and lactic acid concentrations were measured by centrifuging (1000 rpm, 5 min) supernatant of the sampled culture solution using a biochemistry analyzer (model 2700, YSI). The antibody concentration was measured using the Protein A-HPLC method with the supernatant of the sampled culture broth (1000 rpm, 5 min).
- ion exchange chromatography was performed using a cation column (ProPac WCX-10). Results The results are shown in FIG.
- the cell density reached was highest at 37 ° C. without temperature shift, and cell growth was suppressed when the temperature shift was achieved. However, the lower the shift temperature, the higher the viability tends to be maintained, and a high number of viable cells was maintained even in the later stage of culture.
- the amount of antibody production was highest at 3.61 g / L at 37 ° C. without temperature shift, and all that were temperature-shifted were 3.2 g / L or less, and the antibody production amount decreased due to the temperature shift. This is considered that the activity of the cell itself decreased due to the temperature shift.
- the IEC acidic peak is 47.5% without temperature shift, 29.1% at 35 ° C, 18.7% at 34 ° C, 19.4% at 33 ° C, 19.4% at 32 ° C, and 14.7 at 32 ° C. %, The generation was suppressed by the temperature shift, and there was a tendency to decrease as the shift temperature decreased.
- Example 2 Acid peak suppression by temperature shift (examination of shift timing: 1) Initial culture medium A plant-derived hydrolyzate was added to a commercially available serum-free medium for animal cell culture, dissolved and then sterilized by filtration. Feeding medium Glucose was added to a commercially available serum-free medium for animal cell culture, dissolved and then sterilized by filtration. Cell CHO cell line producing recombinant anti-glypican-3 (GPC-3) humanized antibody. Culture method The initial culture medium was added to a 1 L jar type cell culture device (5 units), and the above CHO cell line was seeded at 2 ⁇ 10 5 cells / mL, and the culture was started at 37 ° C.
- the shift temperature is 33 ° C
- the shift timing is 3rd, 4th, 5th and 6th days in order from the culture tank 1.
- No temperature shift is performed, and the subsequent culture is performed at the shifted temperature. It was.
- DO was controlled at 40% and pH at 6.9.
- the feeding medium was added at a constant flow rate from the third day of culture.
- Viable cell count and viability were measured by trypan blue staining. 1 mL of the cell suspension was set in the automatic cell measuring device Cedex, and the number of viable and dead cells was measured. Viable cell count and live cell density (10 5 cells / mL) and survival rate (%) were calculated automatically using data analysis software Cedex Loader (Innovatis, ver. 1.51 or later).
- the glucose and lactic acid concentrations were measured by centrifuging (1000 rpm, 5 min) supernatant of the sampled culture solution using a biochemistry analyzer (model 2700, YSI).
- the antibody concentration was measured using the Protein A-HPLC method with the supernatant of the sampled culture broth (1000 rpm, 5 min).
- IEC ion exchange chromatography was performed using a cation column (ProPac WCX-10). Results The results are shown in FIG.
- the cell density reached was highest in cultures without temperature shift, and cell growth was suppressed in those with temperature shift. The earlier the temperature shift timing, the lower the reached cell density, but the survival rate tended to be maintained.
- Antibody production is highest at 3.61 g / L without temperature shift, 3.57 g / L from 6th day of culture, and 2.91, 2.13, 1.61 in order from 5th, 4th, and 3rd day of culture.
- the glucose concentration increased as the shift timing was earlier.
- Regarding the amount of lactic acid produced accumulation was observed only in the culture without a temperature shift in the latter stage of the culture, but all those with a temperature shift had a concentration of 0.5 g / L or less.
- the acid peak of IEC was 47.5% when there was no temperature shift, 21.9% from 6th day of culture, and 20% or less from 3rd, 4th and 5th days of culture. Even in the temperature shift from the 6th day of culturing, the generation of acidic peak of IEC was suppressed.
- Example 3 Inhibition of acidic peak of antibody by temperature shift (examination of shift timing: 2)
- Initial culture medium A commercially available serum-free medium for animal cell culture was dissolved and then sterilized by filtration.
- Feeding medium Glucose was added to a commercially available serum-free medium for animal cell culture, dissolved and then sterilized by filtration.
- Cells CHO cell line DXB-11 strain; G.G.
- IL-31RA anti-NR10 humanized antibody
- Example 2 Culture method Culture was performed in the same manner as in Example 2. That is, the culture was started at 37 ° C., the shift temperature was 33 ° C., the shift timing was 5 days and 7 days of culture, no temperature shift was performed, and the subsequent culture was performed at the shifted temperature. Analysis method The same method as in Example 2 was used. Results As in Example 2, when the temperature shift was performed, the generation of the acidic peak of the antibody was remarkably suppressed (Fig. 3).
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Abstract
Description
(1)所望のタンパク質を産生する動物細胞を培養して当該タンパク質を産生させることにより所望のタンパク質を製造する際の、所望のタンパク質の不均質(heterogeneity)成分の生成を抑制する方法であって、一定期間通常の培養温度(36℃乃至38℃)で培養した後、培養温度を25℃乃至35℃に低下させて培養を継続することを特徴とする、方法。
(2)動物細胞が、通常の培養温度(36℃乃至38℃)より低温において所望のタンパク質の細胞当たりの生産性が上がらないもしくは生産性が減少する形質を有する細胞である、(1)の方法。
(3)所望のタンパク質の不均質成分の生成を抑制することが、酸性ピークの生成を抑制することを含む、上記方法。
(4)培養開始日から3日後乃至7日後まで通常の培養温度で培養し、その後培養温度を低下させることを特徴とする、上記方法。
(5)一定期間36℃乃至38℃で培養した後、培養温度を32℃乃至35℃に低下させて培養を継続することを特徴とする、上記方法。
(6)細胞を、回分培養法(batch culture)、繰り返し回分培養法(repeated batch culture)、流加培養法(fed-batch culture)、または、繰り返し流加培養法(repeated fed-batch culture)、連続培養法(continuous culture)、灌流培養法(perfusion culture)で培養する、上記方法。
(7)動物細胞を流加培養法で培養する、上記方法。
(8)動物細胞が所望のタンパク質をコードする遺伝子を導入したものである、上記方法。
(9)所望のタンパク質が抗体である、上記方法。
(10)動物細胞が哺乳動物細胞である、上記方法。
(11)哺乳動物細胞がCHO細胞である、(10)の方法。
(12)CHO細胞が、DG44、DXB-11、K-1またはCHO-Sである細胞株から選択される、(11)の方法。
(13)上記方法を用いて所望のタンパク質を産生する細胞を培養して当該タンパク質を製造することを特徴とする、所望のタンパク質の製造方法。
(14)所望のタンパク質を産生する細胞を培養して、培養液中から当該タンパク質を回収する工程を含む、(13)の製造方法。
(15)上記方法で製造されたタンパク質を有効成分とする医薬の製造方法。
(16)所望のタンパク質が抗グリピカン3抗体または抗IL-31RA抗体である、上記方法。
初発培地
市販の動物細胞培養用無血清培地に植物由来の加水分解物を添加し、溶解後濾過滅菌した。
流加培地
市販の動物細胞培養用無血清培地にグルコースを添加し、溶解後濾過滅菌した。
細胞
組換え型抗グリピカン-3(GPC-3)ヒト化抗体(WO2006/006693の実施例24に記載の方法でヒト化し、実施例25の方法でL鎖が改変されたヒト化GC33抗体、抗体クラスはIgG1)を産生するCHO細胞株(DXB-11株;G. Urlaub et al, Proc. Natl. Acad. Sci. USA 77:4216-4220, 1980;ATCCから購入可能)。
培養法
1 Lのジャー型細胞培養装置(5台)に初発培地を加え、これに上記CHO細胞株を2 x105 cells/mLとなるよう播種し、37℃で培養を開始した。培養5日目より温度シフトを行った。シフト温度は、培養槽1から順に、32℃、33℃、34℃、35℃、37℃(温度シフト無し)で、以降の培養は、それぞれシフトした温度で行った。DOは40%、pHは6.9で制御した。流加培地は培養3日目より、一定流速で添加した。
分析方法
生細胞数・生存率測定はトリパンブルー染色法により行った。細胞自動測定装置Cedexに細胞懸濁液1 mLをセットし,生死細胞数測定を実施した。生死細胞数測定及び生細胞密度(105cells/mL)と生存率(%)の算出はデータ解析ソフトウェアCedex Loader(Innovatis,ver. 1.51以降)を用いて自動的に行った。
グルコース及び乳酸濃度測定は、サンプリングした培養液の遠心(1000 rpm, 5 min)上清を、バイオケミストリアナライザー(model 2700,YSI)を用いて測定した。
抗体濃度は、サンプリングした培養液の遠心(1000 rpm, 5 min)上清を、Protein A-HPLC法を用いて測定した。
IECに関しては、陽イオンカラム(ProPac WCX-10)を用いてイオン交換クロマトグラフィーを行った。
結果
結果を図1に示す。
到達細胞密度は、温度シフト無しの37℃の培養が最も高く、温度シフトをしたものは、細胞の増殖が抑制された。しかしながら、シフト温度が低くなるほど、生存率が維持される傾向にあり、培養後期においても高い生細胞数を保っていた。抗体産生量は、温度シフト無しの37℃が3.61 g/Lで最も高く、温度シフトしたものはすべて3.2 g/L以下となり、温度シフトにより抗体産生量が低下した。これは、温度シフトにより細胞自体の活性が低下したものと考える。グルコース及び乳酸の培養挙動に関しては、シフト温度の低下に伴ってグルコース消費量が減少し、乳酸産生量も低下する結果となった。これも、温度シフトにより細胞自身の活性が低下したためと考える。IECの酸性ピークは、温度シフト無しが47.5%に対して、35℃の温度シフトが29.1%、34℃の温度シフトが18.7%、33℃の温度シフトが19.4%、32℃の温度シフトが14.7%と、温度シフトによって生成が抑制され、シフト温度の低下に伴って低下する傾向にもあった。
初発培地
市販の動物細胞培養用無血清培地に植物由来の加水分解物を添加し、溶解後濾過滅菌した。
流加培地
市販の動物細胞培養用無血清培地にグルコースを添加し、溶解後濾過滅菌した。
細胞
組換え型抗グリピカン-3(GPC-3)ヒト化抗体を産生するCHO細胞株。
培養法
1 Lのジャー型細胞培養装置(5台)に初発培地を加え、これに上記CHO細胞株を2 x105 cells/mLとなるよう播種し、37℃で培養を開始した。シフト温度を33℃として、シフトタイミングを、培養槽1.から順に、培養3日目、4日目、5日目、6日目、温度シフト無とし、以降の培養は、シフトした温度で行った。DOは40%、pHは6.9で制御した。流加培地は培養3日目より、一定流速で添加した。
分析方法
生細胞数・生存率測定はトリパンブルー染色法により行った。細胞自動測定装置Cedexに細胞懸濁液1 mLをセットし,生死細胞数測定を実施した。生死細胞数測定及び生細胞密度(105cells/mL)と生存率(%)の算出はデータ解析ソフトウェアCedex Loader(Innovatis,ver. 1.51以降)を用いて自動的に行った。
グルコース及び乳酸濃度測定は、サンプリングした培養液の遠心(1000 rpm, 5 min)上清を、バイオケミストリアナライザー(model 2700,YSI)を用いて測定した。
抗体濃度は、サンプリングした培養液の遠心(1000 rpm, 5 min)上清を、Protein A-HPLC法を用いて測定した。
IECに関しては、陽イオンカラム(ProPac WCX-10)を用いてイオン交換クロマトグラフィーを行った。
結果
結果を図2に示す。
到達細胞密度は、温度シフト無しの培養が最も高く、温度シフトをしたものは細胞の増殖が抑制された。温度シフトのタイミングが早いほど、到達細胞密度が低下する結果となったが、生存率は維持される傾向にあった。抗体産生量は、温度シフト無しが3.61 g/Lで最も高く、培養6日目からの温度シフトが3.57 g/L、培養5、4、3日目からの温度シフトは順に2.91、2.13、1.61 g/Lと温度シフトのタイミングが早くなるに伴って、抗体産生量の低下が見られた。グルコース濃度は、シフトタイミングが早いほどグルコースの蓄積量が多かった。乳酸産生量に関しては、温度シフト無しの培養のみ培養後期に蓄積が見られたが、温度シフトをしたものはすべて0.5g/L以下の濃度であった。IECの酸性ピークは、温度シフト無しが47.5%に対して、培養6日目からの温度シフトが21.9%、培養3、4、5日目からの温度シフトはすべて20%以下となった。培養6日からの温度シフトであっても、IECの酸性ピーク生成が抑制されていた。
初発培地
市販の動物細胞培養用無血清培地を溶解後、濾過滅菌した。
流加培地
市販の動物細胞培養用無血清培地にグルコースを添加し、溶解後濾過滅菌した。
細胞
抗NR10(IL-31RA)ヒト化抗体(WO2009/072604の実施例12に記載の方法で作製した完全ヒト化NS22抗体)を産生するCHO細胞株(DXB-11株;G. Urlaub et al, Proc. Natl. Acad. Sci. USA 77:4216-4220, 1980;ATCCから購入可能)、当該抗NR10ヒト化抗体の抗体クラスはIgG2。
培養法
実施例2と同様の方法で培養を行った。即ち、37℃で培養を開始し、シフト温度を33℃として、シフトタイミングを、培養5日目、7日目、温度シフト無とし、以降の培養は、シフトした温度で行った。
分析方法
実施例2と同様の方法で行った。
結果
実施例2と同様に、温度シフトを行うと、抗体の酸性ピークの生成が顕著に抑制された(図3)。
Claims (16)
- 所望のタンパク質を産生する動物細胞を培養して当該タンパク質を産生させることにより所望のタンパク質を製造する際の、所望のタンパク質の不均質成分の生成を抑制する方法であって、一定期間通常の培養温度で培養した後、培養温度を25℃乃至35℃に低下させて培養を継続することを特徴とする、方法。
- 動物細胞が、通常の培養温度より低温において所望のタンパク質の細胞当たりの生産性が上がらないもしくは生産性が減少する形質を有する細胞である、請求項1記載の方法。
- 所望のタンパク質の不均質成分の生成を抑制することが、酸性ピークの生成を抑制することを含む、請求項1または2記載の方法。
- 培養開始日から3日後乃至7日後まで通常の培養温度で培養し、その後培養温度を低下させることを特徴とする、請求項1または2記載の方法。
- 一定期間36℃乃至38℃で培養した後、培養温度を32℃乃至35℃に低下させて培養を継続することを特徴とする、請求項1または2記載の方法。
- 細胞を、回分培養法(batch culture)、繰り返し回分培養法(repeated batch culture)、流加培養法(fed-batch culture)、または、繰り返し流加培養法(repeated fed-batch culture)、連続培養法(continuous culture)、灌流培養法(perfusion culture)で培養する、請求項1乃至5のいずれかに記載の方法。
- 動物細胞を流加培養法で培養する、請求項1乃至5のいずれかに記載の方法。
- 動物細胞が所望のタンパク質をコードする遺伝子を導入したものである、請求項1乃至7のいずれかに記載の方法。
- 所望のタンパク質が抗体である、請求項8記載の方法。
- 動物細胞が哺乳動物細胞である、請求項1乃至9記載の方法。
- 哺乳動物細胞がCHO細胞である、請求項10記載の方法。
- CHO細胞が、DG44、DXB-11、K-1またはCHO-Sである細胞株から選択される、請求項11記載の方法。
- 請求項1乃至12に記載の方法を用いて所望のタンパク質を産生する細胞を培養して当該タンパク質を製造することを特徴とする、所望のタンパク質の製造方法。
- 所望のタンパク質を産生する細胞を培養して、培養液中から当該タンパク質を回収する工程を含む、請求項13記載の製造方法。
- 請求項13または14に記載の方法で製造されたタンパク質を有効成分とする医薬の製造方法。
- 所望のタンパク質が抗グリピカン3抗体または抗IL-31RAである、請求項1乃至15のいずれかに記載の方法。
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Also Published As
| Publication number | Publication date |
|---|---|
| ZA201304332B (en) | 2014-08-27 |
| RU2615448C2 (ru) | 2017-04-04 |
| BR112013018751A2 (pt) | 2016-08-09 |
| CA2822947A1 (en) | 2012-07-05 |
| BR112013018751B1 (pt) | 2021-01-05 |
| RU2013135255A (ru) | 2015-02-10 |
| AU2011350456A1 (en) | 2013-07-04 |
| HK1248242A1 (zh) | 2018-10-12 |
| JPWO2012091124A1 (ja) | 2014-06-05 |
| IL227185B (en) | 2018-05-31 |
| MX2013007650A (es) | 2013-08-01 |
| MX345399B (es) | 2017-01-30 |
| KR101903208B1 (ko) | 2018-10-01 |
| CN103282509A (zh) | 2013-09-04 |
| MY163081A (en) | 2017-08-15 |
| AU2011350456B2 (en) | 2016-05-26 |
| US20130295613A1 (en) | 2013-11-07 |
| EP2660328A4 (en) | 2016-07-13 |
| JP6001456B2 (ja) | 2016-10-05 |
| KR20130131415A (ko) | 2013-12-03 |
| CN107629124A (zh) | 2018-01-26 |
| EP2660328A1 (en) | 2013-11-06 |
| SG191371A1 (en) | 2013-08-30 |
| NZ611862A (en) | 2015-05-29 |
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