Cited by 422Folate and B Vitamins ResearchCancer, Hypoxia, and MetabolismBiochemical and Molecular Research

Reversal of cytosolic one-carbon flux compensates for loss of the mitochondrial folate pathway

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Ducker, Gregory S., Chen, Li, Morscher, Raphael J., Ghergurovich, Jonathan M., Esposito, Mark, Teng, Xin, Kang, Yibin, Rabinowitz, Joshua D.·2016·Cell Metabolism

Abstract

One-carbon (1C) units for purine and thymidine synthesis can be generated from serine by cytosolic or mitochondrial folate metabolism. The mitochondrial 1C pathway is consistently overexpressed in cancer. Here, we show that most but not all proliferating mammalian cell lines use the mitochondrial pathway as the default for making 1C units. Clustered regularly interspaced short palindromic repeats (CRISPR)-mediated mitochondrial pathway knockout activates cytosolic 1C-unit production. This reversal in cytosolic flux is triggered by depletion of a single metabolite, 10-formyl-tetrahydrofolate (10-formyl-THF), and enables rapid cell growth in nutrient-replete conditions. Loss of the mitochondrial pathway, however, renders cells dependent on extracellular serine to make 1C units and on extracellular glycine to make glutathione. HCT-116 colon cancer xenografts lacking mitochondrial 1C pathway activity generate the 1C units required for growth by cytosolic serine catabolism. Loss of both pathways precludes xenograft formation. Thus, either mitochondrial or cytosolic 1C metabolism can support tumorigenesis, with the mitochondrial pathway required in nutrient-poor conditions.

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Crossref · 10.1016/j.cmet.2016.04.016

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  • Eliminating environmental serine, limiting aspartate synthesis via mitochondrial inhibition, and ablating the mitochondrial folate pathway impair purine biosynthesis.

    “For example, eliminating environmental serine, limiting aspartate synthesis via mitochondrial inhibition, and ablating the mitochondrial folate pathway impairs purine biosynthesis (Ducker et al., 2016; Labuschagne et al., 2014; Sullivan et al., 2015).”

    From Targeting Metabolism for Cancer Therapy (2017) · cites this paper as Ducker et al., 2016

  • In the absence of SHMT2, cytosolic SHMT1 reverses flux to compensate.

    “In the absence of SHMT2, cytosolic SHMT1 reverses flux to compensate69”
  • When the mitochondrial folate pathway is inhibited, the cytosolic pathway reverses flux to compensate; therefore, inhibition of both SHMT isoforms is essential for antitumor activity.

    “Additionally, when the mitochondrial folate pathway is inhibited, the cytosolic pathway reverses flux to compensate; therefore, inhibition of both isoforms is essential for antitumor activity.”
  • MTHFD2 plays a role in redox homeostasis through its cofactor NAD+ and through involvement with expression of hypoxia-related proteins such as HIF-2α.

    “In addition to its involvement in nutrient regulation, MTHFD2 plays a role in redox homeostasis through the use of its cofactor NAD+, as well as involvement with expression of hypoxia-related proteins such as HIF-2α.”

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  1. World Health Organization 2008 The global burden of disease: 2004 update Geneva WHO Press

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Authors
Ducker, G. S., Chen, L., Morscher, R. J., Ghergurovich, J. M., Esposito, M., Teng, X., Kang, Y., & Rabinowitz, J. D.
Affiliations
  • Princeton University (US)
  • Innsbruck Medical University (AT)
Corresponding author
Rabinowitz, Joshua D.
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2016-06
Volume
23
Issue
6
Pages
1140-1153
ISSN
1550-4131 (ISSN-L)
OpenAlex
W2405069786
Cited by
419
References
41
Citations by year
2026: 29 · 2025: 48 · 2024: 48 · 2023: 47 · 2022: 50 · 2021: 41 · 2020: 45 · 2019: 40 · 2018: 35 · 2017: 21 · 2016: 15
FWCI
39.37
Type
journal article
Language
en
Update notices
erratum (2016-10-11)
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by-nc-nd)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
  • US National Institutes of Health (R01CA16359-01A1)
  • Stand Up to Cancer (SU2C-AACR-DT0509)
  • Brewster Foundation
  • NIH (R01CA141062, F31CA192461)
  • US Department of Defense (BC123187)
  • American Cancer Society (PF-15-190-01- TBE)
  • NJCCR postdoctoral fellowship (DFHS15PPC044)
  • PMU-FFF fellowship (L-15/03/004-MOR)
Topics
  • Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
Keywords
one-carbon metabolism, serine catabolism, glutathione synthesis, glycine, CRISPR knockout, tumor cell proliferation, colon cancer xenografts, tumor growth
MeSH terms
Aminoimidazole Carboxamide, Carbon, Cell Compartmentation, Leucovorin, Colonic Neoplasms, Cytosol, Folic Acid, Formates, Glycine, Humans, Methylenetetrahydrofolate Dehydrogenase (NADP), Mitochondria, Mutation, NADP, Ribonucleotides, Serine, Glycine Hydroxymethyltransferase, Gene Library, Xenograft Model Antitumor Assays, HCT116 Cells, Cell Proliferation, Metabolic Networks and Pathways, Gene Knockout Techniques, HEK293 Cells, CRISPR-Cas Systems

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