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Optimization of the medium perfusion rate in a packed-bed bioreactor charged with CHO cells

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Abstract

In the present study, the optimal medium perfusion rate to be used for the continuous culture of a recombinant CHO cell line in a packed-bed bioreactor made of Fibra-Cel® disk carriers was determined. A first-generation process had originally been designed with a high perfusion rate, in order to rapidly produce material for pre-clinical and early clinical trials. It was originally operated with a perfusion of 2.6 vvd during production phase in order to supply the high cell density (2.5×107 cell ml−1 of packed-bed) with sufficient fresh medium. In order to improve the economics of this process, a reduction of the medium perfusion rate by −25% and −50% was investigated at small-scale. The best option was then implemented at pilot scale in order to further produce material for clinical trials with an improved second-generation process. With a −25% reduction of the perfusion rate, the volumetric productivity was maintained compared to the first-generation process, but a −30% loss of productivity was obtained when the medium perfusion rate was further reduced to −50% of its original level. The protein quality under reduced perfusion rate conditions was analyzed for purity, N-glycan sialylation level, abundance of dimers or aggregates, and showed that the quality of the final drug substance was comparable to that obtained in reference conditions. Finally, a reduction of −25% medium perfusion was implemented at pilot scale in the second-generation process, which enabled to maintain the same productivity and the same quality of the molecule, while reducing costs of media, material and manpower of the production process. For industrial applications, it is recommended to test whether and how far the perfusion rate can be decreased during the production phase – provided that the product is not sensitive to residence time – with the benefits of reduced cost of goods and to simplify manufacturing operations.

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Authors and Affiliations

  1. Laboratoires Serono S.A., Zone Industrielle B , Serono Biotech Center, CH-1809, Fenil-sur-Corsier, Switzerland

    F. Meuwly & A. Kadouri

  2. Institute of Chemical Engineering, Swiss Federal Institute of Technology (EPFL), CH-1015 , Lausanne, Switzerland

    U. von Stockar

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  1. F. Meuwly
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  2. U. von Stockar
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  3. A. Kadouri
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Correspondence to U. von Stockar.

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Meuwly, F., von Stockar, U. & Kadouri, A. Optimization of the medium perfusion rate in a packed-bed bioreactor charged with CHO cells. Cytotechnology 46, 37–47 (2004). https://doi.org/10.1007/s10616-005-2105-z

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  • DOI: https://doi.org/10.1007/s10616-005-2105-z

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