Abstract
We investigated the basic technology of cell culture conditions for production of useful substances such as cytokines, and related proteins produced by Namalwa cells. Namalwa cells (Klein, 1972), human B lymphoblastoid cells, were used for large scale production of alpha-interferon (Klein, 1979). Namalwa KJM-1, a subline of Namalwa cells, adapted to serum- and albumin-free medium, can grow at a high density above 1 × 107 cells/ml in suspension mode by the use of a perfusion culture system, Biofermenter™, containing a cone-type cell-sedimentation column as cell separator (Sato, 1983).
Several kinds of cytokine cDNA can be introduced and expressed in Namalwa KJM-1 cells (Miyaji, 1990a,b,c). Some of these were produced in large quantities by use of a gene amplification method with dhfr (Miyaji, 1990c), even though the Namalwa KJM-1 cells contained endogenous dhfr genes. For stable production of the target protein, Namalwa KJM-1 cells are very useful host cells, because they have no effective endogenous protease activity in the conditioned medium.
Using Biofermenter with micro-silicone fibers and a dialysis system, the specific productivity of the target proteins was not depressed at a high cell density.
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Abbreviations
- AP:
-
Ampicillin-resistance gene
- BCIP:
-
5-Bromo-4-Chrolo-3-Indoyl Phosphonate
- BSA:
-
Bovine Serum Albumin
- dhfr:
-
dihydrofolate reductase
- FCS:
-
Fetal Calf Serum
- G-CSF:
-
Granulocyte-Colony Stimulating Factor
- GS:
-
Glutamine Synthetase
- HEPES:
-
4(2-hydroxyethyl)-1-piperazineethanesulfonic acid
- IFN:
-
Interferon
- LT:
-
Lymphotoxin
- MCA:
-
4-Methylcoumaryl-7-amide
- MTX:
-
Methotrexate
- NBS:
-
New Born Bovine Serum
- PBS:
-
Phosphate Buffered Saline
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Hosoi, S., Miyaji, H., Satoh, M. et al. Optimization of cell culture conditions for production of biologically active proteins. Cytotechnology 5 (Suppl 2), 17–34 (1991). https://doi.org/10.1007/BF00573878
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DOI: https://doi.org/10.1007/BF00573878