Abstract
BackgroundGlutamine is an essential component in culture mediafor most of the mammalian cell lines. It is often used asanalternativesourceofenergybycells,alongwithglu-cose. Glutamine metabolism induces ammonia accumu-lation in cell culture. Elevated ammonia concentrationabove 2 mM has been shown to have negative impacton both cell growth and recombinant protein productiv-ity [1-4]. In this study we investigated the effects ofdecreased glutamine concentration in the medium forCHO-DG44 and HEK-293E cells during transient geneexpression (TGE). The rationale was to reduce ammoniaaccumulation in the culture, and consequently, improvecell viability and recombinant protein productivity.Materials and methods
Highlights
Glutamine is an essential component in culture media for most of the mammalian cell lines
We observed a 50% improvement in IgG production for both CHO-DG44 and HEK293 cells
We did not observe a significant difference on cell density or viability between the tested concentrations of glutamine for both CHO-DG44 and HEK293 cells during the entire course of the culture
Summary
Glutamine is an essential component in culture media for most of the mammalian cell lines. It is often used as an alternative source of energy by cells, along with glucose. Glutamine metabolism induces ammonia accumulation in cell culture. Elevated ammonia concentration above 2 mM has been shown to have negative impact on both cell growth and recombinant protein productivity [1,2,3,4]. In this study we investigated the effects of decreased glutamine concentration in the medium for CHO-DG44 and HEK-293E cells during transient gene expression (TGE). The rationale was to reduce ammonia accumulation in the culture, and improve cell viability and recombinant protein productivity
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