Expression of hypoxia-inducible factor 1alpha in brain tumors: association with angiogenesis, invasion, and progression.

Publication Type:

Journal Article

Source:

Cancer, Volume 88, Issue 11, p.2606-18 (2000)

Keywords:

Animals, Brain Neoplasms, DNA-Binding Proteins, Glioma, Hemangioblastoma, Humans, Hypoxia-Inducible Factor 1, Hypoxia-Inducible Factor 1, alpha Subunit, Mice, Neoplasm Proteins, Neovascularization, Pathologic, Nuclear Proteins, Transcription Factors, Tumor Cells, Cultured

Abstract:

BACKGROUND: Hypoxia inducible factor-1 (HIF-1) plays a critical role in angiogenesis during vascular development. The authors tested the hypothesis that HIF-1 expression correlates with progression and angiogenesis in brain tumors.METHODS: The authors investigated the expression of the HIF-1alpha and HIF-1beta subunits in human glioma cell lines and brain tumor tissues using Western blot analysis and immunohistochemistry.RESULTS: In glioblastomas multiforme (GBMs), HIF-1alpha primarily was localized in pseudopalisading cells around areas of necrosis and in tumor cells infiltrating the brain at the tumor margin. In contrast, HIF-1alpha was expressed in stromal cells throughout hemangioblastomas (HBs). Like HIF-1alpha, HIF-1beta was most highly expressed in high grade tumors but was expressed more widely than HIF-1alpha, including cells away from necrotic zones. In the brains of mice injected with Glioma 261 cells, a pattern of HIF-1alpha expression identical to that observed in human GBMs was noted.CONCLUSIONS: In GBMs, the heterogeneous pattern of HIF-1alpha expression appears to be determined at least in part by tissue oxygenation, whereas in HBs the homogeneous expression of HIF-1alpha may be driven by an oncogenic rather than a physiologic stimulus.
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