Highly robust protein production by co-culture of CHO spheroids layered on feeder cells in serum-free medium
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Abstract
Recombinant Chinese hamster ovary (rCHO) cells have been the most commonly used mammalian host for large-scale commercial production of therapeutic proteins. Although recent advances in 3D culture of rCHO cells is preferred to 2D monolayer culture for highly productive and robust expression of therapeutic proteins, there exists still limitation for efficient protein production. Therefore, a new cell culture system is essentially required for an efficient protein production. Here, we report on a new 3D cell culture system as a spheroid cell culture on the micropattern array for efficient production of protein by CHO cells. Particularly, cocultivation of CHO spheroids with bovine aortic endothelial cells (BAEC) as a feeder layer cells was essential to stably increase a protein production. We investigated the co-culture mechanism of functional enhancement with respect to the cell–cell interactions. Functional comparison between 2D and 3D co-cultures suggested the preferred configuration as spheroid for higher protein production. Specifically, to estimate the effect of respective cell constitution in co-cultured spheroids on the protein production per CHO cell, the number of viable cells in cell proliferation was determined with culture periods. These studies demonstrated the significant role of micropatterned BAEC as a feeder layer for the retained formation of CHO spheroids, resulting in predominantly enhanced production of proteins, although the functional enhancement of CHO cells was obtained by co-culture with BAECs in both 2D and 3D configurations. Thus, heterotypic cell communications that play indispensable roles in increasing CHO functions should be properly obtained in 3D cell configurations. Significantly, these spheroids in the serum-free medium drastically enhanced protein expression level up to sevenfold compared with CHO monospheroids, suggesting that a suitable culture conditions for heterotypic cell–cell interactions would allow improved protein secretion to occur unimpeded.
Keywords
Recombinant therapeutic proteins Chinese hamster ovary (CHO) cells Spheroid 3D co-cultureNotes
Acknowledgments
The present study was supported in part by KAKENHI(22700479), “Grant-in-Aid for Young Scientists(B)”, JST, CREST, and Grant-in-Aid for Fundamental Research Project for Autonomous Regeneration Device from New Energy and Industrial Technology Development Organization, Japan. This work was also supported in part by Ministry of Education, Culture, Sports, Science and Technology Grants S0901020.
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