Attenuation of retinal vascular development and neovascularization in PECAM-1-deficient mice.

Developmental Biology
Terri A DiMaioNader Sheibani

Abstract

Platelet-endothelial cell adhesion molecule-1 (PECAM-1/CD31) is expressed on the surface of endothelial cells (EC) at high levels with important roles in angiogenesis and inflammation. However, the physiological role PECAM-1 plays during vascular development and angiogenesis remains largely unknown. Here we determined the role of PECAM-1 in the postnatal development of retinal vasculature and retinal neovascularization during oxygen-induced ischemic retinopathy (OIR) using PECAM-1-deficient (PECAM-1-/-) mice. A significant decrease in retinal vascular density was observed in PECAM-1-/- mice compared with PECAM-1+/+ mice. This was attributed to a decreased number of EC in the retinas of PECAM-1-/- mice. An increase in the rate of apoptosis was observed in retinal vessels of PECAM-1-/- mice, which was compensated, in part, by an increase in the rate of proliferation. However, the development and regression of hyaloid vasculature were not affected in the absence of PECAM-1. We did not observe a significant defect in astrocytes, the number of endothelial tip cell filopodias, and the rate of developing retinal vasculature progression in PECAM-1-/- mice. However, we observed aberrant organization of arterioles and venules, decreased ...Continue Reading

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