Vascular permeability in retinopathy is regulated by VEGFR2 Y949 signaling to VE-cadherin

RO Smith, T Ninchoji, E Gordon, H André, E Dejana… - Elife, 2020 - elifesciences.org
RO Smith, T Ninchoji, E Gordon, H André, E Dejana, D Vestweber, A Kvanta…
Elife, 2020elifesciences.org
Edema stemming from leaky blood vessels is common in eye diseases such as age-related
macular degeneration and diabetic retinopathy. Whereas therapies targeting vascular
endothelial growth factor A (VEGFA) can suppress leakage, side-effects include vascular
rarefaction and geographic atrophy. By challenging mouse models representing different
steps in VEGFA/VEGF receptor 2 (VEGFR2)-induced vascular permeability, we show that
targeting signaling downstream of VEGFR2 pY949 limits vascular permeability in …
Edema stemming from leaky blood vessels is common in eye diseases such as age-related macular degeneration and diabetic retinopathy. Whereas therapies targeting vascular endothelial growth factor A (VEGFA) can suppress leakage, side-effects include vascular rarefaction and geographic atrophy. By challenging mouse models representing different steps in VEGFA/VEGF receptor 2 (VEGFR2)-induced vascular permeability, we show that targeting signaling downstream of VEGFR2 pY949 limits vascular permeability in retinopathy induced by high oxygen or by laser-wounding. Although suppressed permeability is accompanied by reduced pathological neoangiogenesis in oxygen-induced retinopathy, similarly sized lesions leak less in mutant mice, separating regulation of permeability from angiogenesis. Strikingly, vascular endothelial (VE)-cadherin phosphorylation at the Y685, but not Y658, residue is reduced when VEGFR2 pY949 signaling is impaired. These findings support a mechanism whereby VE-cadherin Y685 phosphorylation is selectively associated with excessive vascular leakage. Therapeutically, targeting VEGFR2-regulated VE-cadherin phosphorylation could suppress edema while leaving other VEGFR2-dependent functions intact.
eLife