Abstract
Two prominent vascular endothelial growth factor (VEGF)-induced retinal effects are vascular permeability and capillary nonperfusion. The mechanisms by which these effects occur are not completely known. Using a rat model, we show that intravitreous injections of VEGF precipitate an extensive retinal leukocyte stasis (leukostasis) that coincides with enhanced vascular permeability and capillary nonperfusion. The leukostasis is accompanied by the up-regulation of intercellular adhesion molecule-1 expression in the retina. The inhibition of intercellular adhesion molecule-1 bioactivity with a neutralizing antibody prevents the permeability and leukostasis increases by 79% and 54%, respectively. These data are the first to demonstrate that a nonendothelial cell type contributes to VEGF-induced vascular permeability. Additionally, they identify a potential mechanism for VEGF-induced retinal capillary nonperfusion.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Acridine Orange
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Animals
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Antibodies, Monoclonal / pharmacology
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Capillary Permeability / drug effects*
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Dose-Response Relationship, Drug
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Endothelial Growth Factors / pharmacology*
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Fluorescein Angiography
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Gene Expression Regulation / drug effects
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Intercellular Adhesion Molecule-1 / genetics*
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Intercellular Adhesion Molecule-1 / immunology
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Leukostasis / chemically induced
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Lymphokines / pharmacology*
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Ophthalmoscopy
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RNA / drug effects
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RNA / genetics
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RNA / metabolism
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Rats
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Rats, Long-Evans
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Retina / drug effects
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Retina / metabolism
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Retina / pathology
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Retinal Vessels / drug effects*
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Retinal Vessels / physiology
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Vascular Endothelial Growth Factor A
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Vascular Endothelial Growth Factors
Substances
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Antibodies, Monoclonal
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Endothelial Growth Factors
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Lymphokines
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Vascular Endothelial Growth Factor A
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Vascular Endothelial Growth Factors
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Intercellular Adhesion Molecule-1
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RNA
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Acridine Orange