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Title: Overexpression of cold-inducible RNA-binding protein increases interferon-gamma production in Chinese-hamster ovary cells.
Authors: Tan, H.K.
Lee, M.M.
Yap, M.G. 
Wang, D.I.
Issue Date: Apr-2008
Citation: Tan, H.K., Lee, M.M., Yap, M.G., Wang, D.I. (2008-04). Overexpression of cold-inducible RNA-binding protein increases interferon-gamma production in Chinese-hamster ovary cells.. Biotechnology and applied biochemistry 49 (Pt 4) : 247-257. ScholarBank@NUS Repository.
Abstract: Culturing recombinant CHO (Chinese-hamster ovary) cells at low temperatures (30-33 degrees C) increases specific recombinant protein productivity by 2-5-fold. However, even though the specific productivity is increased, cell growth is decreased in low-temperature culture such that the final recombinant protein titre remains unchanged or is even diminished, owing to the lower cell density. Exposing mammalian cells to low temperatures results in a change in the expression of many 'cold-stress' genes. CIRP (cold-inducible RNA-binding protein) is a cold-stress protein that is highly expressed at 32 degrees C, but not at 37 degrees C. In the present study we demonstrated that overexpression of CIRP at 37 degrees C can increase the recombinant-protein titre in CHO cells. Stable overexpression of CIRP at 37 degrees C improved the final titre of CHO IFN-gamma, a recombinant CHO cell line producing human IFN-gamma (interferon-gamma), by 25% in adherent culture and up to 40% in suspension culture. Real-time PCR analysis showed that the increase in the recombinant IFN-gamma titre could be attributed to increased recombinant IFN-gamma mRNA levels, while growth data showed that CIRP overexpression did not result in growth arrest in CHO IFN-gamma cells. Glycan analysis showed that the increase in IFN-gamma titre as a result of CIRP overexpression did not affect the site occupancy, glycan structures or sialic acid content of IFN-gamma. Using this strategy, the final IFN-gamma titre was increased by 40% compared with current temperature-based strategies. Furthermore, there is no decrease in cell growth or recombinant-protein glycosylation quality, as previously observed in low-temperature culture.
Source Title: Biotechnology and applied biochemistry
ISSN: 14708744
DOI: 10.1042/BA20070032
Appears in Collections:Staff Publications

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