Integrin alpha V beta 5

Integrin alpha V beta 5 is a broadly expressed vitronectin receptor assembled from CD51 and the beta-5 subunit. Unlike alpha V beta 3, it is present on most epithelial and many endothelial cells at baseline, mediating adhesion and spreading on vitronectin, fibrinogen and latent TGF-beta. In the retina it supports the phagocytic clearance of shed photoreceptor outer segments by the retinal pigment epithelium, and its dysfunction has been linked to retinal degeneration. Alpha V beta 5 also acts as a coreceptor with CAR during adenoviral cell entry and contributes to tumor cell migration. The receptor is a target of cilengitide and of RGD-based molecular imaging probes alongside alpha V beta 3.