Cited by 159Cancer, Hypoxia, and MetabolismBiochemical and Molecular ResearchAmino Acid Enzymes and Metabolism

Cellular redox state constrains serine synthesis and nucleotide production to impact cell proliferation

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Diehl, Frances F., Lewis, Caroline A., Fiske, Brian P., Vander Heiden, Matthew G.·2019·Nature Metabolism

Abstract

The de novo serine synthesis pathway is upregulated in many cancers. However, even cancer cells with increased serine synthesis take up large amounts of serine from the environment1 and we confirm that exogenous serine is needed for maximal proliferation of these cells. Here we show that even when enzymes in the serine synthesis pathway are genetically upregulated, the demand for oxidized NAD+ constrains serine synthesis, rendering serine-deprived cells sensitive to conditions that decrease the cellular NAD+/NADH ratio. Further, purine depletion is a major consequence of reduced intracellular serine availability, particularly when NAD+ regeneration is impaired. Thus, cells rely on exogenous serine consumption to maintain purine biosynthesis. In support of this explanation, providing exogenous purine nucleobases, or increasing NAD+ availability to facilitate de novo serine and purine synthesis, both rescue maximal proliferation even in the absence of extracellular serine. Together, these data indicate that NAD+ is an endogenous limitation for cancer cells to synthesize the serine needed for purine production to support rapid proliferation.

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  • Electron shuttles facilitate oxidation of cytosolic NADH, which is required to support continued glycolysis and de novo synthesis of serine and lipids.

    “Beyond supporting net NADH “import” into the mitochondria, these shuttles also facilitate the oxidation of cytosolic NADH, which is required to support continued glycolysis and the de novo synthesis of serine and lipids (101, 102, 103).”
  • PSPH-mediated serine synthesis is upregulated in cancer cells as a mechanism contributing to enhanced nucleotide and amino acid synthesis and antioxidant production, and is a potential novel therapeutic target for treating cancers.

    “It is upregulated in cancer cells as a mechanism contributing to enhanced nucleotide and amino acid synthesis with regard to cell proliferation and antioxidant production, and it is a potential novel therapeutic target for treating cancers [29–31].”

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Authors
Diehl, F. F., Lewis, C. A., Fiske, B. P., & Vander Heiden, M. G.
Affiliations
  • Koch Institute for Integrative Cancer Research At MIT (US)
  • Whitehead Institute for Biomedical Research (US)
Venue
Nature Metabolism
Published
2019-09-16
Volume
1
Issue
9
Pages
861-867
ISSN
2522-5812 (ISSN-L)
OpenAlex
W2973847049
Cited by
159
References
26
Citations by year
2026: 17 · 2025: 15 · 2024: 26 · 2023: 18 · 2022: 24 · 2021: 28 · 2020: 28 · 2019: 3
FWCI
6.96
Type
journal article
Language
en
Open access
Locations
  • Nature Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
  • PMC
Funders
U.S. Department of Health & Human Services | NIH | National Cancer Institute (F31CA236036, T32MH096678, R01CA201276, R01CA168653, P30CA14051)
Topics
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
de novo serine synthesis, NAD+/NADH ratio, redox state, purine biosynthesis, nucleotide production, cell proliferation, cancer metabolism, NAD+ regeneration, purine nucleobases
MeSH terms
Humans, Neoplasms, Nucleotides, Oxidation-Reduction, Serine, Cell Proliferation

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