Catalase effect on cell death for the improvement of recombinant protein production in baculovirus-insect cell system

Abstract

Baculovirus expression vector system (BEVS) in host insect cells is a powerful technology to produce recombinant proteins, as well as virus-like particles (VLP). However, BEVS is based on baculovirus infection, which limits the recombinant protein production by inducing insect cell death. Herein a new strategy to enhance cell life span and to increase recombinant protein production was developed. As baculovirus infection induces cellular oxidative stress, the ability of several antioxidants to inhibit cell death was tested during infection. The production of rotavirus structural proteins was used as model to analyse this new strategy. We found that only catalase is able to partially prevent cell death triggered by baculovirus infection and to inhibit lipid peroxidation. An increase in recombinant protein production was coupled with the partial cell death inhibition. In summary, the addition of catalase is a promising strategy to improve recombinant protein production in BEVS, by delaying insect cell death.