Cited by 301Inflammatory mediators and NSAID effectsCancer, Hypoxia, and MetabolismCancer, Lipids, and Metabolism

Direct transcriptional up-regulation of cyclooxygenase-2 by hypoxia-inducible factor (HIF)-1 promotes colorectal tumor cell survival and enhances HIF-1 transcriptional activity during hypoxia

Kaidi, Abderrahmane, Qualtrough, David, Williams, Ann C., Paraskeva, Christos·2006·Cancer Research

Abstract

Cyclooxygenase (COX)-2, the inducible key enzyme for prostanoid biosynthesis, is overexpressed in most colorectal carcinomas and a subset of colorectal adenomas. Genetic, biochemical, and clinical evidence indicates an important role for COX-2 in colorectal tumorigenesis. Although COX-2 can be induced by aberrant growth factor signaling and oncogene activation during colorectal tumorigenesis, the role of microenvironmental factors such as hypoxia in COX-2 regulation remains to be elucidated. For the first time, we report that under hypoxic conditions COX-2 protein levels increase in colorectal adenoma and carcinoma cells. Rigorous analyses reveal that COX-2 up-regulation is transcriptional and is associated with hypoxia-inducible factor (HIF)-1alpha induction. Oligonucleotide pull-down and chromatin immunoprecipitation assays reveal that HIF-1alpha binds a hypoxia-responsive element on the COX-2 promoter. COX-2 up-regulation during hypoxia is accompanied by increased levels of prostaglandin E(2) (PGE(2)), which promote tumor cell survival under hypoxic conditions. In addition, elevated levels of PGE(2) in hypoxic colorectal tumor cells enhance vascular endothelial growth factor expression and HIF-1 transcriptional activity by activating the mitogen-activated protein kinase pathway, showing a potential positive feedback loop that contributes to COX-2 up-regulation during hypoxia. This study identifies COX-2 as a direct target for HIF-1 in colorectal tumor cells. In addition, COX-2 up-regulation represents a pivotal cellular adaptive response to hypoxia with implication for colorectal tumor cell survival and angiogenesis. We propose that using modified COX-2-selective inhibitors, which are only activated under hypoxic conditions, could potentially be a novel more selective strategy for colorectal cancer prevention and treatment.

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Crossref · 10.1158/0008-5472.can-06-0425

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Authors
Kaidi, A., Qualtrough, D., Williams, A. C., & Paraskeva, C.
Affiliations
Cancer Research UK (GB)
Venue
Cancer Research
Published
2006-07-01
Volume
66
Issue
13
Pages
6683-6691
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2008854828
Cited by
300
References
49
Citations by year
2026: 3 · 2025: 6 · 2024: 10 · 2023: 6 · 2022: 13 · 2021: 17 · 2020: 24 · 2019: 18 · 2018: 13 · 2017: 16 · 2016: 17 · 2015: 23 · 2014: 16 · 2013: 19 · 2012: 22
FWCI
7.73
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (publishedVersion)
  • Explore Bristol Research (submittedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Inflammatory mediators and NSAID effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
Keywords
cyclooxygenase-2, hypoxia-inducible factor-1α, colorectal cancer, colorectal adenoma, hypoxia, prostaglandin E2, hypoxia response element, transcriptional regulation, vascular endothelial growth factor, MAPK signaling, tumor cell survival, angiogenesis, COX-2 selective inhibitors, tumor microenvironment
MeSH terms
Base Sequence, Cell Survival, Humans, Molecular Sequence Data, Promoter Regions, Genetic, Transcription, Genetic, Colorectal Neoplasms, Dinoprostone, Cell Hypoxia, Up-Regulation, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Neoplastic, HT29 Cells, MAP Kinase Signaling System, HCT116 Cells, Cell Growth Processes, Cyclooxygenase 2, Hypoxia-Inducible Factor 1, alpha Subunit

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