Effective temperature shift strategy development and scale confirmation for simultaneous optimization of protein productivity and quality in Chinese hamster ovary cells

AbstractTemperature shifts to lower culture temperatures are frequently employed in the manufacturing of protein therapeutics in mammalian cells to improve productivity, viability, or quality attributes. The direction and extent to which a temperature shift affects productivity and quality may vary depending on the expression host and characteristics of the expressed protein. We demonstrated here that two Chinese hamster ovary (CHO) clones expressing different human monoclonal antibodies responded differently to a temperature shift despite sharing a common parental CHO cell line. Within a single CHO line, we observed a nonlinear response to temperature shift. A moderate shift to 35 °C significantly decreased final titer relative to the unshifted control while a larger shift to 32°C significantly increased final titer by 25%. Therefore, we proposed a systematic empirical approach to assess the utility of a temperature shift for faster implementation during process development . By testing multiple shift parameters, we identified optimum shift conditions in shake flasks and successfully translated findings to benchtop bioreactors and 1,000‐L bioreactor scale. Significant differences in final antibody titer and charge variants were observed with temperature shift increme nts as small as Δ1.5°C. Acidic charge variants decreased monotonically with decreasing shift temperature in both cell lines; however, final antibody titer required simultaneous optimization of shift day an...
Source: Biotechnology Progress - Category: Biotechnology Authors: Tags: RESEARCH ARTICLE Source Type: research