Cited by 122Cancer, Hypoxia, and MetabolismAngiogenesis and VEGF in CancerErythropoietin and Anemia Treatment

Hypoxia-Inducible Factor-1α Promotes Nonhypoxia-Mediated Proliferation in Colon Cancer Cells and Xenografts

Dang, Duyen T., Chen, Fang, Gardner, Lawrence B., Cummins, Jordan M., Rago, Carlo, Bunz, Fred, Kantsevoy, Sergey V., Dang, Long H.·2006·Cancer Research

Abstract

Hypoxia-inducible factor-1α (HIF-1α) is a transcription factor that directly transactivates genes important for the growth and metabolism of solid tumors. HIF-1α is overexpressed in cancer, and its level of expression is correlated with patient mortality. Increased synthesis or stability of HIF-1α can be induced by hypoxia-dependent or hypoxia-independent factors. Thus, HIF-1α is expressed in both nonhypoxic and hypoxic cancer cells. The role of HIF-1α in nonhypoxia-mediated cancer cell proliferation remains speculative. We have disrupted HIF-1α by targeted homologous recombination in HCT116 and RKO human colon cancer cells. Loss of HIF-1α significantly reduced nonhypoxia-mediated cell proliferation in vitro and in vivo. Paradoxically, loss of HIF-1α expression did not grossly affect the hypoxic compartments within tumor xenografts in vivo, although HIF-1α promoted cell proliferation and survival under hypoxia in vitro. To further test the role of HIF-1α within tumor compartments, we generated cells with combined disruptions of both HIF-1α and vascular endothelial growth factor (VEGF). In all xenografts, disruption of VEGF led to marked expansion of the hypoxic compartments and growth delay. Nonetheless, the presence or absence of HIF-1α did not grossly affect these expanded hypoxic compartments. These data provide compelling evidence that, in a subset of colon cancers, (a) HIF-1α is a positive factor for nonhypoxia-mediated cell proliferation in vitro and in vivo and (b) HIF-1α is a positive factor for cell proliferation and survival under hypoxic conditions in vitro, but does not grossly contribute to the tumor hypoxic compartments in vivo. (Cancer Res 2006; 66(3): 1684-93)

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Crossref · 10.1158/0008-5472.can-05-2887

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Authors
Dang, D. T., Chen, F., Gardner, L. B., Cummins, J. M., Rago, C., Bunz, F., Kantsevoy, S. V., & Dang, L. H.
Affiliations
  • University of Michigan (US)
  • NYU Langone Health (US)
  • Sidney Kimmel Cancer Center (US)
  • Johns Hopkins University (US)
Venue
Cancer Research
Published
2006-02-01
Volume
66
Issue
3
Pages
1684-1693
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W1972944556
Cited by
122
References
53
Citations by year
2026: 3 · 2025: 5 · 2024: 3 · 2023: 4 · 2022: 4 · 2021: 6 · 2020: 4 · 2019: 4 · 2018: 6 · 2017: 3 · 2016: 9 · 2015: 5 · 2014: 6 · 2013: 5 · 2012: 6
FWCI
3.79
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (K22CA111897)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K08DK059970, K08DK59970)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
  • Health Sciences › Medicine › Hematology › Erythropoietin and Anemia Treatment
Keywords
hypoxia-inducible factor-1α, colon cancer, cell proliferation, tumor hypoxia, tumor xenografts, vascular endothelial growth factor, HCT116 cells, RKO cells, tumor growth inhibition
MeSH terms
Animals, Cell Survival, Colonic Neoplasms, DNA, Neoplasm, Female, Glycolysis, Humans, Mice, Nude, Transplantation, Heterologous, Cell Hypoxia, Vascular Endothelial Growth Factor A, HCT116 Cells, Cell Growth Processes, Mice, Hypoxia-Inducible Factor 1, alpha Subunit

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