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The Robo4 cytoplasmic domain is dispensable for vascular permeability and neovascularization.


ABSTRACT: Vascular permeability and neovascularization are implicated in many diseases including retinopathies and diabetic wound healing. Robo4 is an endothelial-specific transmembrane receptor that stabilizes the vasculature, as shown in Robo4(-/-) mice that develop hyperpermeability, but how Robo4 signals remained unclear. Here we show that Robo4 deletion enhances permeability and revascularization in oxygen-induced retinopathy (OIR) and accelerates cutaneous wound healing. To determine Robo4 signalling pathways, we generated transgenic mice expressing a truncated Robo4 lacking the cytoplasmic domain (Robo4?CD). Robo4?CD expression is sufficient to prevent permeability, and inhibits OIR revascularization and wound healing in Robo4(-/-) mice. Mechanistically, Robo4 does not affect Slit2 signalling, but Robo4 and Robo4?CD counteract Vegfr2-Y949 (Y951 in human VEGFR2) phosphorylation by signalling through the endothelial UNC5B receptor. We conclude that Robo4 inhibits angiogenesis and vessel permeability independently of its cytoplasmic domain, while activating VEGFR2-Y951 via ROBO4 inhibition might accelerate tissue revascularization in retinopathy of prematurity and in diabetic patients.

SUBMITTER: Zhang F 

PROVIDER: S-EPMC5123080 | biostudies-other | 2016 Nov

REPOSITORIES: biostudies-other

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The Robo4 cytoplasmic domain is dispensable for vascular permeability and neovascularization.

Zhang Feng F   Prahst Claudia C   Mathivet Thomas T   Pibouin-Fragner Laurence L   Zhang Jiasheng J   Genet Gael G   Tong Raymond R   Dubrac Alexandre A   Eichmann Anne A  

Nature communications 20161124


Vascular permeability and neovascularization are implicated in many diseases including retinopathies and diabetic wound healing. Robo4 is an endothelial-specific transmembrane receptor that stabilizes the vasculature, as shown in Robo4<sup>-/-</sup> mice that develop hyperpermeability, but how Robo4 signals remained unclear. Here we show that Robo4 deletion enhances permeability and revascularization in oxygen-induced retinopathy (OIR) and accelerates cutaneous wound healing. To determine Robo4  ...[more]

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