Crit Rev Biochem Mol Biol. 2000;35(2):71-103.

Hypoxia, clonal selection, and the role of HIF-1 in tumor progression.

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Institute of Genetic Medicine, Department of Pediatrics, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-3914, USA. gsemenza@jhmi.edu

Abstract

Tumor progression occurs as a result of the clonal selection of cells in which somatic mutations have activated oncogenes or inactivated tumor suppressor genes leading to increased proliferation and/or survival within the hypoxic tumor microenvironment. Hypoxia-inducible factor 1 (HIF-1) is a transcription factor that mediates adaptive responses to reduced O2 availability, including angiogenesis and glycolysis. Expression of the O2-regulated HIF-1alpha subunit and HIF-1 transcriptional activity are increased dramatically in hypoxic cells. Recent studies indicate that many common tumor-specific genetic alterations also lead to increased HIF-1alpha expression and/or activity. Thus, genetic and physiologic alterations within tumors act synergistically to increase HIF-1 transcriptional activity, which appears to play a critical role in the development of invasive and metastatic properties that define the lethal cancer phenotype.

PMID:: 10821478; [PubMed - indexed for MEDLINE]

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