Birc2 (cIap1) regulates endothelial cell integrity and blood vessel homeostasis.

Abstract:

:Integrity of the blood vessel wall is essential for vascular homeostasis and organ function. A dynamic balance between endothelial cell survival and apoptosis contributes to this integrity during vascular development and pathological angiogenesis. The genetic and molecular mechanisms regulating these processes in vivo are still largely unknown. Here, we show that Birc2 (also known as cIap1) is essential for maintaining endothelial cell survival and blood vessel homeostasis during vascular development. Using a forward-genetic approach, we identified a zebrafish null mutant for birc2, which shows severe hemorrhage and vascular regression due to endothelial cell integrity defects and apoptosis. Using genetic and molecular approaches, we show that Birc2 positively regulates the formation of the TNF receptor complex I in endothelial cells, thereby promoting NF-kappaB activation and maintaining vessel integrity and stabilization. In the absence of Birc2, a caspase-8-dependent apoptotic program takes place that leads to vessel regression. Our findings identify Birc2 and TNF signaling components as critical regulators of vascular integrity and endothelial cell survival, thereby providing an additional target pathway for the control of angiogenesis and blood vessel homeostasis during embryogenesis, regeneration and tumorigenesis.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Santoro MM,Samuel T,Mitchell T,Reed JC,Stainier DY

doi

10.1038/ng.2007.8

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

1397-402

issue

11

eissn

1061-4036

issn

1546-1718

pii

ng.2007.8

journal_volume

39

pub_type

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