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

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.

journal_name

Cancer

journal_title

Cancer

authors

Zagzag D,Zhong H,Scalzitti JM,Laughner E,Simons JW,Semenza GL

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

2606-18

issue

11

eissn

0008-543X

issn

1097-0142

pii

10.1002/1097-0142(20000601)88:11<2606::AID-CNCR25>

journal_volume

88

pub_type

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