Abstract
In order to understand the intracellular responses in recombinant CHO (rCHO) cells producing antibody in serum-free medium (SFM) supplemented with optimized hydrolysates mixtures, yielding the highest specific growth rate (μ, SFM#S1) or the highest specific antibody productivity (q Ab, SFM#S2), differentially expressed proteins in rCHO cells are measured by two-dimensional gel electrophoresis combined with nano-LC-ESI-Q-TOF tandem MS. The comparative proteomic analysis with basal SFM without hydrolysates revealed that the addition of hydrolysate mixtures significantly altered the profiles of CHO proteome. In SFM#S1, the expression of metabolism-related proteins, cytoskeleton-associated proteins, and proliferation-related proteins was up-regulated. On the other hand, the expression of anti-proliferative proteins and pro-apoptotic protein was down-regulated. In SFM#S2, the expression of various chaperone proteins and proliferation-linked proteins was altered. 2D-Western blot analysis of differentially expressed proteins confirmed the proteomic results. Taken together, identification of differentially expressed proteins in CHO cells by a proteomic approach can provide insights into understanding the effect of hydrolysates on intracellular events and clues to find candidate genes for cell engineering to maximize the protein production in rCHO cells.
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Acknowledgments
This research was supported in part by WCU program through the KOSEF funded by the MEST (grant number: R31-2008-000-10071-0) and the Ministry of Knowledge Economy (Strategic Technology Development Project). YH Kim was supported by a grant of Korea Basic Science Institute (G30123).
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Kim, J.Y., Kim, YG., Han, Y.K. et al. Proteomic understanding of intracellular responses of recombinant Chinese hamster ovary cells cultivated in serum-free medium supplemented with hydrolysates. Appl Microbiol Biotechnol 89, 1917–1928 (2011). https://doi.org/10.1007/s00253-011-3106-9
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DOI: https://doi.org/10.1007/s00253-011-3106-9