Regulation of Hypoxia-Inducible Factor 1α Expression and Function by the Mammalian Target of Rapamycin
Open accessAbstract
Hypoxia-inducible factor 1 (HIF-1) is a heterodimeric transcription factor containing an inducibly expressed HIF-1alpha subunit and a constititutively expressed HIF-1beta subunit. Under hypoxic conditions, the HIF-1alpha subunit accumulates due to a decrease in the rate of proteolytic degradation, and the resulting HIF-1alpha-HIF-1beta heterodimers undergo posttranslational modifications that promote transactivation. Recent studies suggest that amplified signaling through phosphoinositide 3-kinase, and its downstream target, mTOR, enhances HIF-1-dependent gene expression in certain cell types. In the present study, we have explored further the linkage between mTOR and HIF-1 in PC-3 prostate cancer cells treated with hypoxia or the hypoxia mimetic agent, CoCl(2). Pretreatment of PC-3 cells with the mTOR inhibitor, rapamycin, inhibited both the accumulation of HIF-1alpha and HIF-1-dependent transcription induced by hypoxia or CoCl(2). Transfection of these cells with wild-type mTOR enhanced HIF-1 activation by hypoxia or CoCl(2), while expression of a rapamycin-resistant mTOR mutant rendered both HIF-1alpha stabilization and HIF-1 transactivating function refractory to inhibition by rapamycin. Studies with GAL4-HIF-1alpha fusion proteins pinpointed the oxygen-dependent degradation domain as a critical target for the rapamycin-sensitive, mTOR-dependent signaling pathway leading to HIF-1alpha stabilization by CoCl(2). These studies position mTOR as an upstream activator of HIF-1 function in cancer cells and suggest that the antitumor activity of rapamycin is mediated, in part, through the inhibition of cellular responses to hypoxic stress.
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Several studies have shown that mTOR inhibition decreases HIF-1α and HIF-2α levels under both normoxic and hypoxic conditions.
“Consistent with this, several studies have shown that mTOR inhibition decreases HIF-1α and HIF-2α levels under both normoxic and hypoxic conditions (Hudson et al., 2002;Majumder et al., 2004;Thomas et al., 2006;Mohlin et al., 2015).”
From Therapeutic targeting of hypoxia and hypoxia-inducible factors in cancer (2016) · cites this paper as Hudson et al., 2002
The Results report that rapamycin inhibited basal HIF-1α expression in normoxic cells and hypoxia-induced HIF-1α accumulation. The passages do not establish the same effect for HIF-2α, so this paper supports only the HIF-1α part of the attributed claim. (LLM, conf=0.90)
Experimental — accuracy not yet measuredInactivating mutations in PTEN or TSC, as well as activating mutations in PI3K or AKT, lead to increased TORC1 activity that promotes HIF-α stabilization.
“Inactivating mutations in phosphatase and tensin homolog (PTEN) or the tuberosis sclerosis complex (TSC) complex, as well as activating mutations in phosphatidylinositol 3-kinase (PI3K) or AKT, lead to increased TORC1 activity that promotes HIF-α stabilization”
From Hypoxic control of metastasis (2016) · cites this paper as [28]
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- Authors
- Hudson, C. C., Liu, M., Chiang, G. G., Otterness, D. M., Loomis, D. C., Kaper, F., Giaccia, A. J., & Abraham, R. T.
- Affiliations
- Duke Medical Center (US)
- Sanford Burnham Prebys Medical Discovery Institute (US)
- Stanford University (US)
- Corresponding author
- Abraham, Robert T.
- Venue
- Molecular and Cellular Biology
- Publisher
- Informa UK Limited
- Published
- 2002-10-01
- Volume
- 22
- Issue
- 20
- Pages
- 7004-7014
- ISSN
- 0270-7306 (ISSN-L)
- 1098-5549
- PMC
- PMC139825
- OpenAlex
- W2120129511
- Cited by
- 1,186
- References
- 52
- Citations by year
- 2026: 18 · 2025: 19 · 2024: 31 · 2023: 30 · 2022: 31 · 2021: 53 · 2020: 44 · 2019: 39 · 2018: 45 · 2017: 52 · 2016: 51 · 2015: 60 · 2014: 58 · 2013: 70 · 2012: 71
- FWCI
- 13.90
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Molecular and Cellular Biology (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Department of Defense
- American Cancer Society
- National Cancer Institute (P01CA067166, CA76193, R01CA076193, CA 67166)
- DOD Prostate Cancer Research Program
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- HIF-1, HIF-1α, mTOR, rapamycin, hypoxia, cobalt chloride, oxygen-dependent degradation domain, prostate cancer, PC-3 cells, phosphoinositide 3-kinase signaling, HIF-1α stabilization, anticancer activity
- MeSH terms
- Phosphoinositide-3 Kinase Inhibitors, Chromones, Cobalt, DNA-Binding Proteins, Enzyme Inhibitors, Humans, Leupeptins, Monosaccharide Transport Proteins, Morpholines, Nuclear Proteins, Protein Kinases, Recombinant Fusion Proteins, Transcription Factors, Transcription, Genetic, Tumor Cells, Cultured, Transcriptional Activation, Cell Hypoxia, Helix-Loop-Helix Motifs, Sirolimus, Protein Kinase Inhibitors, Glucose Transporter Type 1, Hypoxia-Inducible Factor 1, Hypoxia-Inducible Factor 1, alpha Subunit, TOR Serine-Threonine Kinases
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