Cited by 607PI3K/AKT/mTOR signaling in cancerCancer, Hypoxia, and MetabolismMetabolism, Diabetes, and Cancer

Hypoxia-induced energy stress regulates mRNA translation and cell growth

Open access
Liu, Liping, Cash, Timothy P., Jones, Russell G., Keith, Brian, Thompson, Craig B., Simon, M. Celeste·2006·Molecular Cell

Abstract

Oxygen (O2) deprivation, or hypoxia, has profound effects on cell metabolism and growth. Cells can adapt to low O2 in part through activation of hypoxia-inducible factor (HIF). We report here that hypoxia inhibits mRNA translation by suppressing multiple key regulators, including eIF2alpha, eEF2, and the mammalian target of rapamycin (mTOR) effectors 4EBP1, p70S6K, and rpS6, independent of HIF. Hypoxia results in energy starvation and activation of the AMPK/TSC2/Rheb/mTOR pathway. Hypoxic AMP-activated protein kinase (AMPK) activation also leads to eEF2 inhibition. Moreover, hypoxic effects on cellular bioenergetics and mTOR inhibition increase over time. Mutation of the TSC2 tumor suppressor gene confers a growth advantage to cells by repressing hypoxic mTOR inhibition and hypoxia-induced G1 arrest. Together, eIF2alpha, eEF2, and mTOR inhibition represent important HIF-independent mechanisms of energy conservation that promote survival under low O2 conditions.

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Crossref · 10.1016/j.molcel.2006.01.010

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Authors
Liu, L., Cash, T. P., Jones, R. G., Keith, B., Thompson, C. B., & Simon, M. C.
Affiliations
  • Howard Hughes Medical Institute (US)
  • University of Pennsylvania (US)
Corresponding author
Simon, M. Celeste
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2006-02
Volume
21
Issue
4
Pages
521-531
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2128677683
Cited by
607
References
40
Citations by year
2026: 14 · 2025: 13 · 2024: 14 · 2023: 23 · 2022: 23 · 2021: 29 · 2020: 28 · 2019: 23 · 2018: 19 · 2017: 24 · 2016: 29 · 2015: 37 · 2014: 23 · 2013: 45 · 2012: 30
FWCI
20.14
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Cancer Institute (P01CA104838)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
hypoxia, oxygen deprivation, energy stress, mRNA translation, eIF2α, elongation factor 2, mTOR signaling, 4E-BP1, p70S6K, ribosomal protein S6, AMPK, TSC2, Rheb, G1 cell cycle arrest, cell growth, bioenergetics
MeSH terms
Ras Homolog Enriched in Brain Protein, Tuberous Sclerosis Complex 2 Protein, Animals, Hypoxia, Carrier Proteins, Cell Line, Energy Metabolism, Enzyme Activation, Gene Expression Regulation, Humans, Multienzyme Complexes, Neuropeptides, Oxygen, Phosphoproteins, Protein Kinases, RNA, Messenger, Protein Biosynthesis, Signal Transduction, Eukaryotic Initiation Factor-2, Protein Serine-Threonine Kinases, Cell Cycle Proteins, eIF-2 Kinase, Monomeric GTP-Binding Proteins, Peptide Elongation Factor 2, Tumor Suppressor Proteins, Ribosomal Protein S6 Kinases, 70-kDa, Adaptor Proteins, Signal Transducing, Hypoxia-Inducible Factor 1, AMP-Activated Protein Kinases, TOR Serine-Threonine Kinases

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