化学
葡萄糖摄取
L-葡萄糖
补料分批培养
生物反应器
体外
发酵
活力测定
生物物理学
葡萄糖转运蛋白
胰岛素
作者
Matthew Gagnon,Gregory Hiller,Yen-Tung Luan,Amy Kittredge,Jordy DeFelice,Denis Drapeau
摘要
Abstract A simple method for control of lactate accumulation in suspension cultures of Chinese hamster ovary (CHO) cells based on the culture's pH was developed. When glucose levels in culture reach a low level (generally below 1 mM) cells begin to take up lactic acid from the culture medium resulting in a rise in pH. A nutrient feeding method has been optimized which delivers a concentrated glucose solution triggered by rising pH. We have shown that this high‐end pH‐controlled delivery of glucose can dramatically reduce or eliminate the accumulation of lactate during the growth phase of a fed‐batch CHO cell culture at both bench scale and large scale (2,500 L). This method has proven applicable to the majority of CHO cell lines producing monoclonal antibodies and other therapeutic proteins. Using this technology to enhance a 12‐day fed‐batch process that already incorporated very high initial cell densities and highly concentrated medium and feeds resulted in an approximate doubling of the final titers for eight cell lines. The increase in titer was due to additional cell growth and higher cell specific productivity. Biotechnol. Bioeng. 2011; 108:1328–1337. © 2011 Wiley Periodicals, Inc.
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