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Effect of lithium chloride on the production and sialylation of Fc-fusion protein in Chinese hamster ovary cell culture

Applied Microbiology and Biotechnology volume 98, pages 9239–9248 (2014)Cite this article

Abstract

Lithium chloride (LiCl), which is a specific inhibitor of glycogen synthase kinase-3β, is known to induce cell cycle arrest at the G2/M phase and to regulate apoptosis. To determine the potential of LiCl as a chemical additive to enhance specific productivity (q p) of recombinant Chinese hamster ovary (rCHO) cells through cell cycle arrest at G2/M phase, rCHO cells producing Fc-fusion protein were cultivated in serum-free media with LiCl concentrations ranging from 0 to 20 mM. The addition of LiCl induced cell cycle arrest at G2/M phase and thereby decreased the specific cell growth rate. However, LiCl increased q p in a dose-dependent manner. The beneficial effect of LiCl on q p outweighed its detrimental effect on μ, resulting in improved maximum Fc-fusion protein concentration (MFPC) at 10 mM LiCl. The q p and MFPC in the bioreactor culture with 10 mM LiCl were 5.0 and 2.1 times higher than those without LiCl, respectively. In addition, the presence of LiCl at 10 mM did not significantly affect either intracellular α2,3-ST or extracellular sialidase activity. LiCl also inhibited apoptosis of cells in the decline phase of growth by increasing Bcl-2 expression. Taken together, the results obtained in this study demonstrate the potential of LiCl as a q p-enhancing additive in CHO cell culture for improved recombinant protein production.

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Acknowledgments

This research was supported in part by a grant from the intelligent synthetic biology center of global frontier project funded by the MEST (2011-0031962) and a grant from the Chungcheong leading industry promotion project funded by the MKE, Republic of Korea.

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Affiliations

  1. Biotechnology Process Engineering Center, KRIBB, Ochang, 363-883, South Korea

    Yeon-Gu Kim

  2. Department of Biological Sciences, KAIST, 335 Gwahak-ro, Yuseong-gu, Daejeon, 305-701, South Korea

    Tae Kwang Ha & Gyun Min Lee

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  1. Tae Kwang Ha
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  2. Yeon-Gu Kim
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Correspondence to Gyun Min Lee.

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Ha, T.K., Kim, YG. & Lee, G.M. Effect of lithium chloride on the production and sialylation of Fc-fusion protein in Chinese hamster ovary cell culture. Appl Microbiol Biotechnol 98, 9239–9248 (2014). https://doi.org/10.1007/s00253-014-6012-0

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  • DOI: https://doi.org/10.1007/s00253-014-6012-0

Keywords

  • Lithium chloride
  • Chinese hamster ovary cell
  • Cell cycle
  • Specific productivity
  • Sialylation