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Diabetes, Vol 46, Issue 9 1473-1480, Copyright © 1997 by American Diabetes Association
Vascular endothelial growth factor-induced retinal permeability is mediated by protein kinase C in vivo and suppressed by an orally effective beta-isoform-selective inhibitor
LP Aiello, SE Bursell, A Clermont, E Duh, H Ishii, C Takagi, F Mori, TA Ciulla, K Ways, M Jirousek, LE Smith and GL King
Research Division, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Increased vascular permeability and excessive neovascularization are the
hallmarks of endothelial dysfunction, which can lead to diabetic macular
edema and proliferative diabetic retinopathy in the eye. Vascular
endothelial growth factor (VEGF) is an important mediator of ocular
neovascularization and a known vasopermeability factor in nonocular
tissues. In these studies, we demonstrate that intravitreal injection of
VEGF rapidly activates protein kinase C (PKC) in the retina at
concentrations observed clinically, inducing membrane translocation of PKC
isoforms alpha, betaII, and delta and >threefold increases in retinal
vasopermeability in vivo. The effect of VEGF on retinal vascular
permeability appears to be mediated predominantly by the beta-isoform of
PKC with >95% inhibition of VEGF-induced permeability by intravitreal or
oral administration of a PKC beta-isoform-selective inhibitor that did not
inhibit histamine-mediated effects. These studies represent the first
direct demonstration that VEGF can increase intraocular vascular
permeability through activation of PKC in vivo and suggest that oral
pharmacological therapies involving PKC beta-isoform-selective inhibitors
may prove efficacious for the treatment of VEGF-associated ocular disorders
such as diabetic retinopathy.

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