IRE1 signaling is essential for ischemia-induced vascular endothelial growth factor-A expression and contributes to angiogenesis and tumor growth in vivo.

Abstract:

:In solid tumors, cancer cells subjected to ischemic conditions trigger distinct signaling pathways contributing to angiogenic stimulation and tumor development. Characteristic features of tumor ischemia include hypoxia and glucose deprivation, leading to the activation of hypoxia-inducible factor-1-dependent signaling pathways and to complex signaling events known as the unfolded protein response. Here, we show that the activation of the endoplasmic reticulum stress sensor IRE1 is a common determinant linking hypoxia- and hypoglycemia-dependent responses to the up-regulation of vascular endothelial growth factor-A (VEGF-A). Tumor cells expressing a dominant-negative IRE1 transgene as well as Ire1alpha-null mouse embryonic fibroblasts were unable to trigger VEGF-A up-regulation upon either oxygen or glucose deprivation. These data correlated with a reduction of tumor angiogenesis and growth in vivo. Our results therefore suggest an essential role for IRE1-dependent signaling pathways in response to ischemia and identify this protein as a potential therapeutic target to control both the angiogenic switch and tumor development.

journal_name

Cancer Res

journal_title

Cancer research

authors

Drogat B,Auguste P,Nguyen DT,Bouchecareilh M,Pineau R,Nalbantoglu J,Kaufman RJ,Chevet E,Bikfalvi A,Moenner M

doi

10.1158/0008-5472.CAN-06-3235

subject

Has Abstract

pub_date

2007-07-15 00:00:00

pages

6700-7

issue

14

eissn

0008-5472

issn

1538-7445

pii

67/14/6700

journal_volume

67

pub_type

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