Cited by 113Cancer, Hypoxia, and MetabolismUbiquitin and proteasome pathwaysHeat shock proteins research

Proteasomal Inhibition Attenuates Transcriptional Activity of Hypoxia-Inducible Factor 1 (HIF-1) via Specific Effect on the HIF-1α C-Terminal Activation Domain

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Kaluz, Stefan, Kaluzová, Milota, Stanbridge, Eric J.·2006·Molecular and Cellular Biology

Abstract

The ubiquitin-proteasome pathway (UPP) is involved in regulation of multiple cellular processes. Hypoxia-inducible factor 1 alpha (HIF-1 alpha) is a prototypic target of the UPP and, as such, is stabilized under conditions of proteasomal inhibition. Using carbonic anhydrase IX (CAIX) and vascular endothelial growth factor (VEGF) expression as paradigmatic markers of HIF-1 activity, we found that proteasomal inhibitors (PI) abrogated hypoxia-induced CAIX expression in all cell lines tested and VEGF expression in two out of three. Mapping of the inhibitory effect identified the C-terminal activation domain (CAD) of HIF-1 alpha as the primary target of PI. PI specifically inhibited the HIF-1 alpha CAD despite activating the HIF-1 alpha coactivator p300 and another p300 cysteine/histidine-rich domain 1-dependent transcription factor, STAT-2. Coimmunoprecipitation and glutathione S-transferase pull downs indicated that PI does not disrupt interactions between HIF-1 alpha and p300. Mutational analysis failed to confirm involvement of sites of known or putative posttranslational modifications in regulation of HIF-1 alpha CAD function by PI. Our data provide evidence for the counterintuitive hypothesis that inhibition of HIF-1 function could be responsible for at least some of the antitumor effects of proteasomal inhibition. Further studies of the mechanism of the PI-induced attenuation of HIF-1alpha will provide important, potentially novel insight into regulation of HIF-1 activity and possibly identify new targets for HIF-directed therapy.

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  • Bortezomib is associated with suppression of HIF-1 signaling despite expectation that proteasome inhibition would stabilize HIF-α subunits.

    “bortezomib, a clinically approved proteasome inhibitor used in multiple myeloma, has been repeatedly associated with suppression of HIF-1 signaling, despite the expectation that proteasome inhibition would stabilize HIF-α subunits [[336], [337], [338]].”

    From HIF inhibition: Current strategies and clinical challenges (2026) · cites this paper as [336]

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Authors
Kaluz, S., Kaluzová, M., & Stanbridge, E. J.
Affiliations
  • Department of Microbiology and Molecular Genetics, College of Medicine, University of California at Irvine
  • University of California, Irvine (US)
Venue
Molecular and Cellular Biology
Published
2006-08-01
Volume
26
Issue
15
Pages
5895-5907
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2103794392
Cited by
108
References
64
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 5 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 8 · 2016: 8 · 2015: 9 · 2014: 7 · 2013: 5 · 2012: 8
FWCI
4.31
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
Avon Foundation for Women
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
proteasome inhibition, HIF-1α, HIF-1, ubiquitin-proteasome system, C-terminal activation domain, carbonic anhydrase IX, vascular endothelial growth factor, P300, transcriptional regulation, anticancer activity
MeSH terms
Bortezomib, Animals, Hypoxia, Boronic Acids, Carbonic Anhydrases, Cell Line, Enzyme Activation, Gene Expression Regulation, Humans, Isoenzymes, Protease Inhibitors, Pyrazines, Recombinant Fusion Proteins, Transcription, Genetic, Biomarkers, Protein Structure, Tertiary, Vascular Endothelial Growth Factor A, Proteasome Endopeptidase Complex, p300-CBP Transcription Factors, Hypoxia-Inducible Factor 1, alpha Subunit, Proteasome Inhibitors

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