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Neuro Oncol 2005 7(2):134-153; DOI:10.1215/S1152851704001115
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Duke University Press

Tumor Biology

Hypoxia and the hypoxia-inducible-factor pathway in glioma growth and angiogenesis

Balveen Kaur, Fatima W. Khwaja, Eric A. Severson, Shannon L. Matheny, Daniel J. Brat and Erwin G. Van Meir2

Laboratory of Molecular Neuro-Oncology, Department of Neurosurgery and Hematology/Oncology (F.W.K., E.A.S., S.L.M), and Pathology (D.J.B.), Winship Cancer Institute (B.K., E.G.V.M.), Emory University School of Medicine, Atlanta, GA 30322, USA

2 Address correspondence to Erwin G. Van Meir, Winship Cancer Institute, Emory University School of Medicine, 1365C Clifton Road, NE, Room C5078, Atlanta, GA 30322, USA (evanmei{at}emory.edu).

Abstract

Glioblastomas, like other solid tumors, have extensive areas of hypoxia and necrosis. The importance of hypoxia in driving tumor growth is receiving increased attention. Hypoxia-inducible factor 1 (HIF-1) is one of the master regulators that orchestrate the cellular responses to hypoxia. It is a heterodimeric transcription factor composed of {alpha} and ß subunits. The {alpha} subunit is stable in hypoxic conditions but is rapidly degraded in normoxia. The function of HIF-1 is also modulated by several molecular mechanisms that regulate its synthesis, degradation, and transcriptional activity. Upon stabilization or activation, HIF-1 translocates to the nucleus and induces transcription of its downstream target genes. Most important to gliomagenesis, HIF-1 is a potent activator of angiogenesis and invasion through its upregulation of target genes critical for these functions. Activation of the HIF-1 pathway is a common feature of gliomas and may explain the intense vascular hyperplasia often seen in glioblastoma multiforme. Activation of HIF results in the activation of vascular endothelial growth factors, vascular endothelial growth factor receptors, matrix metalloproteinases, plasminogen activator inhibitor, transforming growth factors {alpha} and ß, angiopoietin and Tie receptors, endothelin-1, inducible nitric oxide synthase, adrenomedullin, and erythropoietin, which all affect glioma angiogenesis. In conclusion, HIF is a critical regulatory factor in the tumor microenvironment because of its central role in promoting proangiogenic and invasive properties. While HIF activation strongly promotes angiogenesis, the emerging vasculature is often abnormal, leading to a vicious cycle that causes further hypoxia and HIF upregulation.

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