A MST1-FOXO1 cascade establishes endothelial tip cell polarity and facilitates sprouting angiogenesis.

Abstract:

:Hypoxia is a main driver of sprouting angiogenesis, but how tip endothelial cells are directed to hypoxic regions remains poorly understood. Here, we show that an endothelial MST1-FOXO1 cascade is essential for directional migration of tip cells towards hypoxic regions. In mice, endothelial-specific deletion of either MST1 or FOXO1 leads to the loss of tip cell polarity and subsequent impairment of sprouting angiogenesis. Mechanistically, MST1 is activated by reactive oxygen species (ROS) produced in mitochondria in response to hypoxia, and activated MST1 promotes the nuclear import of FOXO1, thus augmenting its transcriptional regulation of polarity and migration-associated genes. Furthermore, endothelial MST1-FOXO1 cascade is required for revascularization and neovascularization in the oxygen-induced retinopathy model. Together, the results of our study delineate a crucial coupling between extracellular hypoxia and an intracellular ROS-MST1-FOXO1 cascade in establishing endothelial tip cell polarity during sprouting angiogenesis.

journal_name

Nat Commun

journal_title

Nature communications

authors

Kim YH,Choi J,Yang MJ,Hong SP,Lee CK,Kubota Y,Lim DS,Koh GY

doi

10.1038/s41467-019-08773-2

subject

Has Abstract

pub_date

2019-02-19 00:00:00

pages

838

issue

1

issn

2041-1723

pii

10.1038/s41467-019-08773-2

journal_volume

10

pub_type

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