title: Enhanced interferon-beta production by CHO cells through elevated osmolality and reduced culture temperature.
abstract: For efficient production of native interferon-beta (IFN-beta) in recombinant CHO cell culture, the IFN-beta molecular aggregation that occurs during culture needs to be minimized. To do so, we investigated the effect of hyperosmolality and hypothermia on IFN-beta production and molecular aggregation in rCHO cell culture. Both hyperosmolality (470 mOsm/kg) and hypothermia (32 degrees C) increased specific native INF-beta productivity q(IFN-beta). Furthermore, they decreased the IFN-beta molecular aggregation, although severe IFN-beta molecular aggregation could not be avoided in the later phase of culture. To overcome growth suppression at hyperosmolality and hypothermia, cells were cultivated in a biphasic mode. Cells were first cultivated at 310 mOsm/kg and 37 degrees C for 2 days to rapidly obtain a reasonably high cell concentration. The temperature and osmolality were then shifted to 32 degrees C and 470 mOsm/kg, respectively, to achieve high q(IFN-beta) and reduced IFN-beta molecular aggregation. Due to the enhanced q(IFN-beta) and delayed molecular aggregation, the highest native IFN-beta concentration achieved on day 6 was 18.03 +/- 0.61 mg/L, which was 5.30-fold higher than that in a control batch culture (310 mOsm/kg and 37 degrees C). Taken together, a combination of hyperosmolality and hypothermia in a biphasic culture is a useful strategy for improved native IFN-beta production from rCHO cells.
authors: Dept. of Biological Sciences, KAIST, Yuseong-gu, Daejeon, Korea.
authors: Young Kue
authors: YK
authors: Han
authors: Tai Young
authors: TY
authors: Koo
authors: Gyun Min
authors: GM
authors: Lee
mesh_terms: D000818:Animals; D016466:CHO Cells; D018929:Cell Culture Techniques / Q000379:methods*; D049109:Cell Proliferation; D002470:Cell Survival; D002474:Cell-Free System; D006224:Cricetinae; D003412:Cricetulus; D006801:Humans; D016899:Interferon-beta / Q000235:genetics / Q000378:metabolism*; D009994:Osmolar Concentration; D055503:Protein Multimerization; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*; D013696:Temperature
chemical_list: D011994:Recombinant Proteins; D016899:Interferon-beta