Effect of culture pH on recombinant antibody production by a new human cell line, F2N78, grown in suspension at 33.0 °C and 37.0 °C.

The human host cell line, F2N78, is a new somatic hybrid cell line designed for therapeutic antibody production. To verify its potential as a human host cell line, recombinant F2N78 cells that produce antibody against rabies virus (rF2N78) were cultivated at different culture pH (6.8, 7.0, 7.2, 7.4, and 7.6) and temperatures (33.0 °C and 37.0 °C). Regardless of the culture temperature, the highest specific growth rate was obtained at a pH of 7.0-7.4. Lowering the culture temperature from 37.0 °C to 33.0 °C suppressed cell growth while allowing maintenance of high cell viability for a longer period. However, it did not enhance antibody production because specific antibody productivity did not increase at 33.0 °C. The highest maximum antibody concentration was obtained at 37.0 °C and pH 6.8. The N-linked glycosylation of the antibody was affected by the culture pH rather than the temperature. Nevertheless, G1F was dominant and G2F occupied a larger portion than G0F in all culture conditions. Compared to the same antibody produced from recombinant CHO cells, the antibody produced from rF2N78 cells has more galactose capping and was more similar to human plasma IgG. Taken together, the results obtained here demonstrate the potential of F2N78 as an alternative human host cell line for therapeutic antibody production.