NADPH production by the oxidative pentose-phosphate pathway supports folate metabolism
Abstract
NADPH donates high-energy electrons for antioxidant defence and reductive biosynthesis. Cytosolic NADP is recycled to NADPH by the oxidative pentose-phosphate pathway (oxPPP), malic enzyme 1 (ME1) and isocitrate dehydrogenase 1 (IDH1). Here we show that any one of these routes can support cell growth, but the oxPPP is uniquely required to maintain a normal NADPH/NADP ratio, mammalian dihydrofolate reductase (DHFR) activity and folate metabolism. These findings are based on CRISPR deletions of glucose-6-phosphate dehydrogenase (G6PD, the committed oxPPP enzyme), ME1, IDH1 and combinations thereof in HCT116 colon cancer cells. Loss of G6PD results in high NADP, which induces compensatory increases in ME1 and IDH1 flux. But the high NADP inhibits DHFR, resulting in impaired folate-mediated biosynthesis, which is reversed by recombinant expression of Escherichia coli DHFR. Conclusively, across different cancer cell lines, G6PD deletion produced consistent changes in folate-related metabolites, suggesting a general requirement for the oxPPP to support folate metabolism.
- Authors:
-
- Princeton Univ., Princeton, NJ (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Publication Date:
- Research Org.:
- Center for Advanced Bioenergy and Bioproducts Innovation (CABBI), Urbana, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1501460
- Grant/Contract Number:
- SC0018420
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Metabolism
- Additional Journal Information:
- Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 2522-5812
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Chen, Li, Zhang, Zhaoyue, Hoshino, Atsushi, Zheng, Henry D., Morley, Michael, Arany, Zoltan, and Rabinowitz, Joshua D. NADPH production by the oxidative pentose-phosphate pathway supports folate metabolism. United States: N. p., 2019.
Web. doi:10.1038/s42255-019-0043-x.
Chen, Li, Zhang, Zhaoyue, Hoshino, Atsushi, Zheng, Henry D., Morley, Michael, Arany, Zoltan, & Rabinowitz, Joshua D. NADPH production by the oxidative pentose-phosphate pathway supports folate metabolism. United States. https://doi.org/10.1038/s42255-019-0043-x
Chen, Li, Zhang, Zhaoyue, Hoshino, Atsushi, Zheng, Henry D., Morley, Michael, Arany, Zoltan, and Rabinowitz, Joshua D. Mon .
"NADPH production by the oxidative pentose-phosphate pathway supports folate metabolism". United States. https://doi.org/10.1038/s42255-019-0043-x. https://www.osti.gov/servlets/purl/1501460.
@article{osti_1501460,
title = {NADPH production by the oxidative pentose-phosphate pathway supports folate metabolism},
author = {Chen, Li and Zhang, Zhaoyue and Hoshino, Atsushi and Zheng, Henry D. and Morley, Michael and Arany, Zoltan and Rabinowitz, Joshua D.},
abstractNote = {NADPH donates high-energy electrons for antioxidant defence and reductive biosynthesis. Cytosolic NADP is recycled to NADPH by the oxidative pentose-phosphate pathway (oxPPP), malic enzyme 1 (ME1) and isocitrate dehydrogenase 1 (IDH1). Here we show that any one of these routes can support cell growth, but the oxPPP is uniquely required to maintain a normal NADPH/NADP ratio, mammalian dihydrofolate reductase (DHFR) activity and folate metabolism. These findings are based on CRISPR deletions of glucose-6-phosphate dehydrogenase (G6PD, the committed oxPPP enzyme), ME1, IDH1 and combinations thereof in HCT116 colon cancer cells. Loss of G6PD results in high NADP, which induces compensatory increases in ME1 and IDH1 flux. But the high NADP inhibits DHFR, resulting in impaired folate-mediated biosynthesis, which is reversed by recombinant expression of Escherichia coli DHFR. Conclusively, across different cancer cell lines, G6PD deletion produced consistent changes in folate-related metabolites, suggesting a general requirement for the oxPPP to support folate metabolism.},
doi = {10.1038/s42255-019-0043-x},
journal = {Nature Metabolism},
number = 3,
volume = 1,
place = {United States},
year = {Mon Mar 11 00:00:00 EDT 2019},
month = {Mon Mar 11 00:00:00 EDT 2019}
}
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