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IE921020A1 - Serum-free medium for culturing mammalian cells - Google Patents

Serum-free medium for culturing mammalian cells

Info

Publication number
IE921020A1
IE921020A1 IE102092A IE921020A IE921020A1 IE 921020 A1 IE921020 A1 IE 921020A1 IE 102092 A IE102092 A IE 102092A IE 921020 A IE921020 A IE 921020A IE 921020 A1 IE921020 A1 IE 921020A1
Authority
IE
Ireland
Prior art keywords
medium according
medium
culturing
mammalian cells
erythropoietin
Prior art date
Application number
IE102092A
Inventor
Stefan Koch
Ulrich Behrendt
Reinhard Franze
Original Assignee
Boehringer Mannheim Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boehringer Mannheim Gmbh filed Critical Boehringer Mannheim Gmbh
Publication of IE921020A1 publication Critical patent/IE921020A1/en

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    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/0018Culture media for cell or tissue culture
    • C12N5/0043Medium free of human- or animal-derived components
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2500/00Specific components of cell culture medium
    • C12N2500/05Inorganic components
    • C12N2500/10Metals; Metal chelators
    • C12N2500/20Transition metals
    • C12N2500/24Iron; Fe chelators; Transferrin
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2500/00Specific components of cell culture medium
    • C12N2500/05Inorganic components
    • C12N2500/10Metals; Metal chelators
    • C12N2500/20Transition metals
    • C12N2500/24Iron; Fe chelators; Transferrin
    • C12N2500/25Insulin-transferrin; Insulin-transferrin-selenium
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2501/00Active agents used in cell culture processes, e.g. differentation
    • C12N2501/30Hormones
    • C12N2501/38Hormones with nuclear receptors
    • C12N2501/39Steroid hormones

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Genetics & Genomics (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Microbiology (AREA)
  • Biochemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Cell Biology (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

A serum-free medium for the cultivation of mammalian cells without protein material of animal origin contains, besides conventional ingredients in place of animal insulin and transferring recombinant insulin from prokaryotes and a water-soluble iron compound. A medium of this type is used according to the invention for the cultivation of mammalian cells, especially CHO cells.

Description

The present invention is concerned with a serumfree medium for culturing mammalian cells without protein material of animal origin, as well as with a process for the culturing of mammalian cells and especially of CHO cells with the use of such a medium and, finally, with a process for the gene-technological production of erythropoietin in which the correspondingly transformed CHO cells grow in the culture medium according to the present invention.
For the growth of animal cells in a culture, as a medium supplement in general serum and mostly foetal calf serum is a prerequisite. To a base medium containing certain base components, for example inorganic salts, amino acids, monosaccharides, vitamins and the like, is thereby admixed an addition of a particular amount of serum, the cells thereby being provided with conditions which are as favourable as possible for growth in the cell culture.
Attempts have already been made to exchange the serum by replacement materials in known serum-free media. Thus, for example from DE-OS 37 33 453, a serumfree medium is known for the culturing of hybridoma and myeloma cells which, in a synthetic culturing medium, contains a water-soluble iron compound besides other known additive materials. In the description, it is, in this regard, stated that this water-soluble iron compound represents a replacement for the transferrin -3contained in the serum. According to this publication, the there-mentioned media can be used for culturing hybridoma and myeloma cells.
However, further materials are contained in serum 5 which can influence the growth of mammalian cells.
Besides transferrin, insulin and albumin are also to be especially mentioned. Therefore, quite generally, for the culturing of mammalian cells, in the case of the use of a serum-free medium, care should be taken to come as close as possible to the conditions which are present in the case of the addition of serum. However, for the production of therapeutics, the materials used are critical. In the case of cell culture products, the authorities make, inter alia, an especial note of proteins as medium additive materials which are of animal or human origin because, via these components, for example pathogenic viruses can also get into the cell culture media and possibly into the end product.
Therefore, it is an object of the present invention to provide a serum-free culture medium for mammalian cells of quite general kind which comes very close to the culturing conditions with the use of a medium containing serum but which medium contains no protein material of animal origin which could represent a danger of viral contamination. •Ε 921020 -4Thus, according to the present invention, there is provided a serum-free medium for culturing mammalian cells without protein material of animal origin containing, besides usual component materials, instead of animal insulin and transferrin, recombinant insulin from prokaryotes and a water-soluble iron compound .
Due to the maintenance of the insulin in the medium according to the present invention, the culture conditions are distinctly more similar to culture conditions with the use of serum than is the case with known serum-free culture media. Furthermore, due to the use of recombinant insulin from prokaryotes in the medium according to the present invention, the danger of viral contaminations is avoided.
Usual component materials of culture media are known to the expert and are, for example, the component materials which are contained in the media such as Dulbecco's modified Eagle's medium (DMEM) (Virology _8, 396/1959) or in medium F12 (Ham's F12 medium, Proc.
Natl. Acad. Sci. USA 53 , 288/1965). Such component materials include, inter alia, amino acids and vitamins, as well as other components, such as glucose, sodium pyruvate, certain fatty acids and inorganic salts.
In a preferred embodiment of the present invention, the medium contains insulin in an amount of 0.1 to 20 mg/1 and the water-soluble iron compound in -5- 5 - 2 a concentration of 10 to 10 mol/1. As watersoluble iron compound, there are especially used ferric citrate, ferric sulphate, ferric chloride and/or potassium ferricyanide.
For a facilitation in the case of the culturing, it is, in addition, preferred additionally to add a pH indicator to the medium. Such pH indicators are known to the expert. For example, phenol red may be mentioned .
An especially preferred serum-free medium according to the present invention comprises amino acids in a concentration of 3 to 700 mg/1, vitamins of 0.001 to 50 mg/1, monosaccharides of 0.3 to 10 g/1, inorganic salts of 0.1 to 10,000 mg/1, trace elements of 0.001 to 0.1 mg/1, nucleosides of 0.1 to 50 mg/1, fatty acids of 0.001 to 10 mg/1, biotin of 0.01 to 1 mg/1, hydrocortisone of 0.1 to 20 pg/l, insulin of 0.1 to 20 mg/1, vitamin B12 of 0.1 to 10 mg/1, putrescine of 0.01 to 1 mg/1, sodium pyruvate of 10 to 500 mg/1, the water20 soluble iron compound, as well as optionally a pH indicator and antibiotics, said compounds being present dissolved in water. The statements of concentration thereby refer in each case to the individual components and not to the sum of the mentioned compounds. Thus, according to the present invention, there can be used, for example, mixtures of DMEM and F12 medium. Other commercially obtainable media which correspond to the -6compositions as are given above can also be used as base media and are then correspondingly supplemented with the special components recombinant insulin and water-soluble iron compound.
Furthermore, in the scope of the present invention, it is especially preferred that the medium additionally contains polyvinyl alcohol and/or methyl cellulose. The use of polyvinyl alcohol is described, for examp],e, in European Patent Application 0 248 656, as well as by B.D. Bavister in The Journal of Experimental Zoology, 217, 45-51/1981 and Shintani et. al in Appl. Microbiol. Biotechnol. , 27 , 533-537/1988.
The addition of polyvinyl alcohol and/or of methyl cellulose is also advantageous for the medium according to the present invention. The compounds are thereby advantageously used in a concentration of 0.1 to 20 g/1.
The medium according to the present invention is especially characterised in that it is particularly suitable for culturing CHO cells. The particularly good suitability of the medium according to the present invention has shown itself especially in the case of culturing CHO cells which contain and express a foreign gene. In the scope of the present invention, the foreign gene to be expressed in CHO cells is preferably the gene for erythropoietin.
Therefore, the present invention also provides a process for culturing mammalian cells, especially of -ΊCHO cells, in a medium according to the present invention. A manner of procedure has thereby proved to be preferred in which there is used a culture medium according to the present invention impoverished in certain substances and then, during the culturing, there are added twice, preferably after 48 and 96 hours, in each case 2% by volume of a mixture of 0.1 to 1 g/1 of recombinant insulin, 40 to 200 g/1 glucose and 0.4 to 3 g/1 of each of aspartic acid, asparagine monohydrate, histidine, methionine, proline and serine, 1 to 5 g/1 cysteine monohydrochloride monohydrate, to 8 g/1 glutamine and 0.2 to 2 g/1 tryptophane, whereafter the corresponding concentrations of the medium according to the present invention are achieved.
In the case of this preferred carrying out of the process, it has been shown that the growth can be maintained over a long period of time at a relatively high rate and thus cell amounts can be obtained which are higher than in the case of immediate use of the culture medium and the consumption of the corresponding compounds taking place from the beginning.
The process according to the present invention is again preferably employed for culturing CHO cells and especially CHO cells which secrete erythropoietin.
Therefore, the present invention also provides a process for the gene-technological production of erythropoietin in which CHO cells containing the gene -8for erythropoietin are cultured in a medium according to the present invention or are cultured according to a process of the present invention, erythropoietin being isolated from the culture medium.
The following Examples are given for the purpose of illustrating the present invention, reference being made to the accompanying drawings in which Fig. 1 shows the living cell density in dependence upon the period of culturing in the case of using different media and Fig. 2 shows the total cell density in dependence upon the period of culturing.
Examples .
Description of the medium used in the Examples.
The medium of the Examples given hereinafter contains amino acids in a concentration of 3 to 700 mg/1, vitamins of 0.001 to 50 mg/1, monosaccharides of 0.3 to 10 g/1, inorganic salts of 0.1 to 10000 mg/1, trace elements of 0.001 to 0.1 mg/1, nucleosides of 0.1 to 50 mg/1 and fatty acids of 0.01 to 10 mg/1, as well as sodium pyruvate (10 to 500 mg/1) and a pH indicator.
The medium was prepared on the basis of a mixture consisting of equal parts by volume of the DMEM and F12 media (Dulbecco's modified Eagle's medium and nutrient mixture Hams F-12). As special components, there are present -9biotin hydrocortisone insulin (recombinant) putrescine vitamin B12 Furthermore, the medium of transferrin (human) sodium selenite polyvinyl alcohol Furthermore, the medium of iron citrate polyvinyl alcohol Furthermore, the medium of iron citrate methyl cellulose In all three Example! under the usual conditions Example 1. 0.2036 mg/1 3.6 pg/l 5.0 mg/1 0.1 mg/1 0.78 mg/1 Example 1 contains: mg/1 5 ug/1 1 g/1 Example 2 contains: 124 mg/1 g/1 Example 3 contains: 124 mg/1 0.5 g/1 , CHO cells were cultured (37°C, 57, carbon dioxide).
In the case of the use of a medium which contains 5 mg/1 transferrin, 5 pg/l sodium selenite and 1 g/1 polyvinyl alcohol, as maximum values for the living cell density were achieved 8.1 x 10^/ml (after 189 hours culture period) and for the total cell density .8 x 10^/rnl (after 197 hours culture period).
Example 2.
In the case of the use of a medium which contains 124 mg/1 iron citrate and 1 g/1 polyvinyl alcohol, as -10maximum values for the living cell density were achieved .3 x 10^/mg (after 164 hours culture period) and for the total cell density 25.7 x 10^/ml (after 164 hours culture period).
Example 3.
In the case of the use of a medium which contains 124 mg/1 iron citrate and 0.5 g/1 methyl cellulose, as maximum values for the living cell density were achieved 14.4 x 10^/ml (after 185 hours culture period) and for 10 the total cell density 26.0 x 10^/ml (after 193 hours culture period).
The values obtained for the living and total cell densities of Examples 1 to 3 are illustrated graphically in Figures 1 and 2 of the accompanying drawings.

Claims (19)

1. Patent Claims
1. Serum-free medium for culturing mammalian cells without protein material of animal origin, containing besides usual component materials, instead of animal 5 insulin and transferrin, recombinant insulin from prokaryotes and a water-soluble iron compound.
2. Medium according to claim 1, wherein it contains insulin in an amount of from 0.1 to 20 mg/1 and the water-soluble iron compound in a concentration of 10 10“ 5 to 10 2 mol/1.
3. Medium according to claim 1 or 2, wherein, as water-soluble iron compound, it contains iron citrate, iron sulphate, iron chloride and/or potassium ferricyanide . 15
4. Medium according to any of the preceding claims, wherein it additionally contains a pH indicator.
5. Serum-free medium according to any of the preceding claims, wherein it comprises amino acids in a concentration of 3 to 700 mg/1, vitamins of 0.001 to 20 50 mg/1, monosaccharides of 0.3 to 10 g/1, inorganic salts of 0.1 to 10,000 mg/1, trace elements of 0.001 to 0.1 mg/1, nucleosides of 0.1 to 50 mg/1, fatty acids of 0.001 to 10 mg/1, biotin of 0.01 to 1 mg/1, hydrocortisone of 0.1 to 20 pg/l, insulin of 0.1 to 20 mg/1, 25 vitamin B12 of 0.1 to 10 mg/1, putrescine of 0.01 to 1 mg/1, sodium pyruvate of 10 to 500 mg/1, the watersoluble iron compound, as well as optionally a pH indicator and antibiotics, dissolved in water. -126. Medium according to any of the preceding claims, wherein it additionally contains polyvinyl alcohol and/or methyl cellulose.
6. 7. Medium according to claim 6, wherein it contains 5 polyvinyl alcohol and/or methyl cellulose in a concentration of 0.1 to 20 g/1.
7. 8. Medium according to any of the preceding claims, wherein it is used for culturing CHO cells.
8. 9. Medium according to claim 8, wherein it is used
9. 10 for culturing CHO cells which contain and express a foreign gene. 10. Medium according to claim 9, wherein the foreign gene to be expressed is the gene for erythropoietin.
10. 11. Serum-free medium according to claim 1 for 15 culturing mammalian cells, substantially as hereinbefore described and exemplified.
11. 12. Process for culturing mammalian cells and especially CHO cells, wherein the culturing is carried out in a medium according to any of claims 1 to 11. 20
12. 13. Process according to claim 12, wherein there is used an impoverished culture medium and, during the culturing, there are added twice in each case 2% by volume of a mixture of 0.1 to 1 g/1 of recombinant insulin, 40 to 200 g/1 glucose and 0.4 to 3 g/1 of 25 each of aspartic acid, asparagine monohydrate, histidine, methionine, proline and serine, 1 to 5 g/1 cysteine monohydrochloride monohydrate, 1 to 8 g/1 glutamine and -130.2 to 2 g/1 tryptophane, whereafter the corresponding concentrations of a medium according to any of claims 1 to 11 are reached.
13. 14. Process according to claim 13, wherein the two 5 additions are made after 48 and 96 hours.
14. 15. Process according to any of claims 12 to 14, wherein CHO cells are cultured which secrete erythropoietin.
15. 16. Process for the gene-technological production of 10 erythropoietin, wherein CHO cells containing the gene for erythropoietin are cultured in a medium according to any of claims 1 to 11 or according to a process according to any of claims 12 to 15 and the erythropoietin is isolated from the culture medium. 15
16. 17. Process according to claim 12 for culturing mammalian cells, substantially as hereinbefore described and exemplified.
17. 18. Mammalian cells, whenever cultured by the process according to any of claims 12 to 17.
18. 20
19. Erythropoietin, whenever produced by the process according to any of claims 12 to 17.
IE102092A 1991-05-14 1992-03-30 Serum-free medium for culturing mammalian cells IE921020A1 (en)

Applications Claiming Priority (1)

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DE4115722A DE4115722A1 (en) 1991-05-14 1991-05-14 SERUM-FREE MEDIUM FOR CULTIVATING SUGAR CELLS

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EP (1) EP0513738A3 (en)
JP (1) JPH05252942A (en)
DE (1) DE4115722A1 (en)
IE (1) IE921020A1 (en)

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US11661579B2 (en) 2007-04-26 2023-05-30 Chugai Seiyaku Kabushiki Kaisha Cell culture method using amino acid-enriched medium

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US5548064A (en) * 1993-05-24 1996-08-20 Biotech Australia Pty Limited Vitamin B12 conjugates with EPO, analogues thereof and pharmaceutical compositions
EP0699944B1 (en) 1994-08-26 2000-06-07 Eastman Kodak Company Tabular grain emulsions with sensitization enhancements
IL118201A (en) * 1995-05-11 2004-12-15 Roche Diagnostics Gmbh Preparation comprising a protein with human erythropoietin activity which is free of serum and non-recombinant mammalian protein and process for the preparation thereof
US5952226A (en) * 1996-11-05 1999-09-14 Modex Therapeutiques Hypoxia responsive EPO producing cells
SE9700983D0 (en) * 1997-03-18 1997-03-18 Ascendia Ab Stimulation, culture and preservation of pancreatic and other cells
BR9905868A (en) 1998-11-06 2001-01-23 Bio Sidus S A Mass culture procedure for mammalian cells to obtain recombinant human erythropoietin and recombinant human erythropoietin obtained with such procedure
DE10011998A1 (en) * 2000-03-11 2001-09-20 Forschungszentrum Juelich Gmbh Combination of active ingredients and methods for cultivating cells and methods for producing the combination of active ingredients
CN100528235C (en) 2000-12-20 2009-08-19 霍夫曼-拉罗奇有限公司 Conjugates of erythropoietin
GB0304799D0 (en) 2003-03-03 2003-04-09 Glaxosmithkline Biolog Sa Novel method
US7972810B2 (en) 2005-12-08 2011-07-05 Amgen Inc. Production of glycoproteins using manganese
PT2054074E (en) 2006-08-04 2014-11-07 Prolong Pharmaceuticals Llc Modified erythropoietin
WO2009127098A1 (en) * 2008-04-18 2009-10-22 上海中信国健药业有限公司 A concentrated culture solution and application method thereof
MX2012003558A (en) 2009-09-23 2012-07-03 Biogenerix Ag Process for the purification of recombinant human erythropoietin (epo), epo thus purified and pharmaceutical compositions comprising same.
RU2663794C2 (en) * 2011-10-21 2018-08-09 Пфайзер Инк. Adding iron to improve cell culture
US9217168B2 (en) 2013-03-14 2015-12-22 Momenta Pharmaceuticals, Inc. Methods of cell culture

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NZ210501A (en) * 1983-12-13 1991-08-27 Kirin Amgen Inc Erythropoietin produced by procaryotic or eucaryotic expression of an exogenous dna sequence
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WO1988000967A1 (en) * 1986-08-04 1988-02-11 The University Of New South Wales Serum free tissue culture medium containing polymeric cell-protective agent
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11661579B2 (en) 2007-04-26 2023-05-30 Chugai Seiyaku Kabushiki Kaisha Cell culture method using amino acid-enriched medium

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EP0513738A2 (en) 1992-11-19
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JPH05252942A (en) 1993-10-05

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