Cited by 85Cancer, Hypoxia, and MetabolismAmino Acid Enzymes and MetabolismPI3K/AKT/mTOR signaling in cancer

Prolyl hydroxylases as regulators of cell metabolism

Boulahbel, Houda, Durán, Raúl V., Gottlieb, Eyal·2009·Biochemical Society Transactions

Abstract

Cellular response to oxygen depletion is mediated by HIF (hypoxia-inducible factor). HIF is a heterodimer consisting of a constitutively expressed subunit (HIFβ) and an oxygen-regulated subunit (HIFα). HIFα stability is regulated by prolyl hydroxylation by PHD (prolyl hydroxylase domain-containing protein) family members. PHD activity depends on the availability of molecular oxygen, making PHDs the oxygen-sensing system in animal cells. However, PHDs have recently been shown to respond to stimuli other than oxygen, such as 2-oxoglutarate (α-ketoglutarate), succinate or fumarate, as illustrated by the pseudo-hypoxic response in succinate dehydrogenase- or fumarate dehydrogenase-deficient tumours. Moreover, HIFα is not the sole PHD effector, suggesting that PHDs have functions that extend beyond oxygen sensing. Currently, we are investigating the role of PHDs in the cellular response to amino acid deprivation, a process regulated by mTOR (mammalian target of rapamycin). The precise mechanism whereby amino acids are signalling to mTOR is not fully understood. Given that 2-oxoglutarate is a limiting co-substrate for PHD activity during normoxia and that 2-oxoglutarate levels depend on amino acid availability, it is possible that PHD activity depends not only on oxygen, but also on amino acid availability, suggesting a global metabolic sensor function for PHDs which could be signalling not only to HIF, but also to mTOR.

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Crossref · 10.1042/bst0370291

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Authors
Boulahbel, H., Durán, R. V., & Gottlieb, E.
Affiliations
Cancer Research UK (GB)
Venue
Biochemical Society Transactions
Published
2009-01-20
Volume
37
Issue
1
Pages
291-294
ISSN
  • 0300-5127 (ISSN-L)
  • 1470-8752
OpenAlex
W2031638748
Cited by
82
References
33
Citations by year
2025: 2 · 2024: 5 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 3 · 2018: 3 · 2017: 5 · 2016: 10 · 2015: 2 · 2014: 5 · 2013: 9 · 2012: 12
FWCI
0.61
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical Society Transactions (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
prolyl hydroxylase, hypoxia-inducible factor, oxygen sensing, alpha-ketoglutarate, succinic acid, fumarate, succinate dehydrogenase deficiency, amino acid starvation, mTOR signaling, cellular metabolism, metabolic sensing
MeSH terms
Animals, Cells, Humans, Procollagen-Proline Dioxygenase, Protein Kinases, Cell Hypoxia, Hypoxia-Inducible Factor 1, TOR Serine-Threonine Kinases

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