Overexpression of G6PDH does not affect the behavior of HEK-293 clones stably expressing interferon-α2b

Edwige Arnold; Iness Hammami; Jingkui Chen; Sachin Gupte; Yves Durocher; Mario Jolicoeur; Edwige Arnold; Iness Hammami; Jingkui Chen; Sachin Gupte; Yves Durocher; Mario Jolicoeur

doi:10.3934/bioeng.2016.3.319

AIMS Bioengineering

2016, Volume 3, Issue 3: 319-336. doi: 10.3934/bioeng.2016.3.319

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Overexpression of G6PDH does not affect the behavior of HEK-293 clones stably expressing interferon-α2b

1.
Research Laboratory in Applied Metabolic Engineering, Department of Chemical Engineering, École Polytechnique de Montréal, Montréal, Québec, Canada
2.
Department of Pharmacology, New York Medical College, Valhalla, NY 10595
3.
National Research Council, Montréal, Québec, Canada

Received: 15 June 2016 Accepted: 18 July 2016 Published: 27 July 2016

HEK293 cells are gaining in interest for the production of recombinant proteins. However, further understanding and engineering of cell metabolism are still needed to improve protein titers. The importance of G6PDH has already been studied regarding redox balance, and a correlation has recently been established between the oxidative pentose phosphate pathway (PPP) and antibody peak production. In this work, HEK293 cells stably expressing interferon-α2b, a parental clone, and a further engineered clone expressing the cytosolic yeast pyruvate-carboxylase (PYC) were transiently transfected to overexpress glucose-6-phosphate dehydrogenase (G6PDH) and increase fluxes through the PPP. The aim of the study was thus to evaluate the effect of overexpressing G6PDH on the “pull” effect brought by the PYC phenotype. Results indicate that the cell metabolism is, however, highly robust, showing a highly regulated PPP damping the potential effects of overexpressing G6PDH. A metabolomic study also clearly demonstrates, by metabolites profiling, that the PYC clone has a highly robust and more efficient metabolic efficiency, compared to its parental clone.
- G6PDH overexpression,
- Pentose Phosphate Pathway,
- HEK-293,
- metabolomics,
- cell energetics,
- Pyruvate Carboxylase
Citation: Edwige Arnold, Iness Hammami, Jingkui Chen, Sachin Gupte, Yves Durocher, Mario Jolicoeur. Overexpression of G6PDH does not affect the behavior of HEK-293 clones stably expressing interferon-α2b[J]. AIMS Bioengineering, 2016, 3(3): 319-336. doi: 10.3934/bioeng.2016.3.319

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Abstract

HEK293 cells are gaining in interest for the production of recombinant proteins. However, further understanding and engineering of cell metabolism are still needed to improve protein titers. The importance of G6PDH has already been studied regarding redox balance, and a correlation has recently been established between the oxidative pentose phosphate pathway (PPP) and antibody peak production. In this work, HEK293 cells stably expressing interferon-α2b, a parental clone, and a further engineered clone expressing the cytosolic yeast pyruvate-carboxylase (PYC) were transiently transfected to overexpress glucose-6-phosphate dehydrogenase (G6PDH) and increase fluxes through the PPP. The aim of the study was thus to evaluate the effect of overexpressing G6PDH on the “pull” effect brought by the PYC phenotype. Results indicate that the cell metabolism is, however, highly robust, showing a highly regulated PPP damping the potential effects of overexpressing G6PDH. A metabolomic study also clearly demonstrates, by metabolites profiling, that the PYC clone has a highly robust and more efficient metabolic efficiency, compared to its parental clone.

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