The Influence of Serum Concentration on tPA Production of CHO Cell

Abstract

The effect of initial serum concentration on cell growth, and the production of tissue plasminogen activator (tPA) is investigated across batch fermentation of a Chinese hamster ovary (CHO) growing in newborn calf serum (NCS) medium. It was found that initial serum concentration influenced on CHO cell growth rate and cell yield. At high-serum content, the uptake rate of glucose decreased although the specific growth rate was higher, indicating a serum component becoming growth limiting. An average glucose uptake rate in 10% (v/v) NCS medium was 13.84 mg/106 cells/h as in 1% (v/v) NCS medium was 18.17 mg/10⁶ cells/h. It was also found that the tPA or the maximum tPA productions increased with initial serum concentration. At 7.12% NCS, the maximum tPA production gave the highest value (5.55 mg/l). The effect of initial serum concentration on the main product was similar to that of major by-product (e.g. lactate and ammonia).