Hydrogen peroxide produced by angiopoietin-1 mediates angiogenesis.

Abstract:

:Angiopoietin-1 (Ang1) mediates angiogenesis by enhancing endothelial cell survival and migration. It is also known that Ang1 activates Tie2, an endothelial-specific tyrosine kinase receptor, but the molecular mechanism of this process is not clear. In this study, we investigated whether reactive oxygen species (ROS) production plays a role in Ang1-mediated angiogenesis. We found that human umbilical vein endothelial cells treated with Ang1 produce ROS transiently, which was suppressed by NADPH oxidase inhibitor, diphenylene-iodonium chloride, and rotenone. The Ang1-induced ROS was identified as hydrogen peroxide (H2O2) using adenovirus-catalase infection. Removal of H2O2 by adenovirus-catalase significantly suppressed Ang1-induced in vitro endothelial cell migration, in vivo tubule formation and angiogenesis, and activation of p44/42 mitogen-activated protein kinase (MAPK), involved in cell migration, and delayed the deactivation of Akt phosphorylation involved in cell survival. Supporting to in vitro data, Ang1-induced vascular remodeling in catalase (-/-) mice was more prominent than in catalase (+/+) mice: Ang1-induced increases of the diameter of terminal arterioles and the postcapillary venules in catalase (-/-) mice were significant compared with catalase (+/+) mice. These results show that Ang1-induced H2O2 plays an important role in Ang1-mediated angiogenesis by modulating p44/42 MAPK activity.

journal_name

Cancer Res

journal_title

Cancer research

authors

Kim YM,Kim KE,Koh GY,Ho YS,Lee KJ

doi

10.1158/0008-5472.CAN-05-3640

subject

Has Abstract

pub_date

2006-06-15 00:00:00

pages

6167-74

issue

12

eissn

0008-5472

issn

1538-7445

pii

66/12/6167

journal_volume

66

pub_type

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