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Oncogene. 2008 Sep 11;27(40):5354-8. doi: 10.1038/onc.2008.160. Epub 2008 May 19.

Hypoxia-inducible factor-2 regulates vascular tumorigenesis in mice.

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  • 1Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6144, USA.

Abstract

The von Hippel-Lindau tumor suppressor pVHL regulates the stability of hypoxia-inducible factors (HIF)-1 and -2, oxygen-sensitive basic helix-loop-helix transcription factors, which mediate the hypoxic induction of angiogenic growth factors such as vascular endothelial growth factor. Loss of pVHL function results in constitutive activation of HIF-1 and HIF-2 and is associated with the development of highly vascularized tumors in multiple organs. We have used a conditional gene-targeting approach to investigate the relative contributions of HIF-1 and HIF-2 to VHL-associated vascular tumorigenesis in a mouse model of liver hemangiomas. Here we demonstrate genetically that conditional inactivation of HIF-2alpha suppressed the development of VHL-associated liver hemangiomas and that angiogenic gene expression in hepatocytes is predominantly regulated by HIF-2 and not by HIF-1. These findings suggest that HIF-2 is the dominant HIF in the pathogenesis of VHL-associated vascular tumors and that pharmacologic targeting of HIF-2 may be an effective strategy for their treatment.

PMID:
18490920
[PubMed - indexed for MEDLINE]
PMCID:
PMC2575082
Free PMC Article
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