Abstract
Low cost and high efficiency make disposable bioreactors feasible for small-scale therapeutic development and initial clinical trials. We have developed a cryogel-based disposable bioreactor matrix, which has been used for production of protein therapeutics such as urokinase and monoclonal antibodies (mAbs). The protocol discusses the application of a cryogel bioreactor for mAb production. Cryogels composed of either polyacrylamide (PAAm) coupled to gelatin or semi-interpenetrating PAAm-chitosan are synthesized by free-radical polymerization at −12 °C. Hybridoma cells are immobilized over the cryogel bioreactor and incubated for 48 h. Medium is circulated thereafter at 0.2 ml min−1 and bioreactors can be run continuously for 60 d. The cryogel-based packed-bed bioreactor can be formulated as a monolith or as beads; it also has an efficiency four times what can be obtained using a tissue-culture flask, a high surface-to-volume ratio and effective nutrient transport. After incubation, the bioreactor setup will take about 60 min using a pre-prepared sterilized cryogel.
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Acknowledgements
We acknowledge the financial support from the Department of Biotechnology, Ministry of Science and Technology, Government of India; Protista Biotechnology Sweden; and the Swedish Research Council/SIDA Research Link Project. We are also thankful to all other co-workers, especially V. Bansal, S. Nilsang and B. Mattiasson who have contributed to the development of this work in one way or another. We also thank A. Karande for her kind help in providing the hybridoma cell lines and for mAb analysis.
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Both the authors (E.J. and A.K.) conceived, planned and conducted experiments on different aspects of this study. A.K. was responsible for supervising all the work described in this protocol.
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Supplementary Methods
Determination of Monoclonal Antibody; Analysis of Glucose in spent media samples; Determination of Ammonia; Simultaneous Determination of Glucose, Lactic acid, and Glutamine by HPLC; and Determination of Urokinase Activity (PDF 369 kb)
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Jain, E., Kumar, A. Disposable polymeric cryogel bioreactor matrix for therapeutic protein production. Nat Protoc 8, 821–835 (2013). https://doi.org/10.1038/nprot.2013.027
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DOI: https://doi.org/10.1038/nprot.2013.027
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