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Eiji Sakurai, Hogara Taguchi, Akshay Anand, Balamurali K. Ambati, Evangelos S. Gragoudas, Joan W. Miller, Anthony P. Adamis, Jayakrishna Ambati; Targeted Disruption of the CD18 or ICAM-1 Gene Inhibits Choroidal Neovascularization. Invest. Ophthalmol. Vis. Sci. 2003;44(6):2743-2749. doi: 10.1167/iovs.02-1246.
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purpose. To investigate the role of the leukocyte adhesion molecules CD18 and intercellular adhesion molecule (ICAM)-1 in the development of choroidal neovascularization (CNV).
methods. Laser photocoagulation was used to induce CNV in wild-type C57BL/6J mice and species-specific counterparts with targeted homozygous disruption of the CD18 or ICAM-1 gene. Expression of CD18 and ICAM-1 after laser injury was assessed by immunostaining. CNV responses were compared on the basis of en masse volumetric measurements obtained by confocal microscopy 2 weeks after laser injury and by determination of fluorescein angiographic leakage at 1, 2, and 4 weeks after laser injury.
results. The site of laser injury showed upregulation of ICAM-1 and invasion by CD18-positive leukocytes within 1 day of laser injury. Significantly fewer lesions exhibited fluorescein leakage defined to be pathologically significant in CD18-deficient mice at weeks 1, 2, and 4 weeks and in ICAM-1–deficient mice at 1 and 4 weeks, compared with the control. There were a significantly greater number of lesions without fluorescein leakage in CD18-deficient mice than in the other two groups at all time points. The volume of CNV in CD18- and ICAM-1–deficient mice was significantly less than in wild type.
conclusions. These data suggest a nonredundant role for leukocyte adhesion to vascular endothelium in the development of laser-induced choroidal neovascularization.
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