Abstract
Chinese hamster ovary (CHO) cells are the main workhorse in the biopharmaceutical industry for the production of recombinant proteins, such as monoclonal antibodies. To date, a variety of metabolic engineering approaches have been used to improve the productivity of CHO cells. While genetic manipulations are potentially laborious in mammalian cells, rational design of CHO cell culture medium or efficient fed-batch strategies are more popular approaches for bioprocess optimization. In this study, a genome-scale metabolic network model of CHO cells was used to design feeding strategies for CHO cells to improve monoclonal antibody (mAb) production. A number of metabolites, including threonine and arachidonate, were suggested by the model to be added into cell culture medium. The designed composition has been experimentally validated, and then optimized, using design of experiment methods. About a two-fold increase in the total mAb expression has been observed using this strategy. Our approach can be used in similar bioprocess optimization problems, to suggest new ways of increasing production in different cell factories.
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Data availability
All data generated or analyzed during this study are included in this published article and its supplementary information files. The metabolic model of CHO cells is publicly available in the supporting information of the original article (Hefzi et al. Cell Systems, 2016), which has been cited in our article. The cell line which has been used in our study is available in Radin Biotech Company of Iran.
Abbreviations
- CHO:
-
Chinese hamster ovary
- mAbs:
-
Monoclonal antibodies
- GEMs:
-
Genome-scale metabolic network models
- GPR:
-
Gene–protein–reaction
- FVSEOF:
-
Flux variability scanning based on enforced objective flux
- DoE:
-
Design of experiment
- PB:
-
Plackett–Burman
- RSM:
-
Response surface methodology
- CCD:
-
Central composite design
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Acknowledgements
We have to kindly thank Samira Ahmadi and Radin Biotech Company, Iran, for gifting the CHO cell line to be used in our study.
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H.F. and S.-A.M. designed the computational studies. N.E.L. was involved in computational modeling of CHO cells metabolism. H.F., B.V., F.T., and F.M. designed the lab experiments. H.F. wrote the main manuscript. N.E.L., B.V., and S.-A.M. reviewed the manuscript. All authors read and approved the final manuscript.
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Fouladiha, H., Marashi, SA., Torkashvand, F. et al. A metabolic network-based approach for developing feeding strategies for CHO cells to increase monoclonal antibody production. Bioprocess Biosyst Eng 43, 1381–1389 (2020). https://doi.org/10.1007/s00449-020-02332-6
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DOI: https://doi.org/10.1007/s00449-020-02332-6