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• W1935192134 abstract "The final stage in the migration of leukocytes to sites of inflammation involves movement of leukocytes through the endothelial cell layer and the perivascular basement membrane. Both platelet-endothelial cell adhesion molecule-1 (PECAM-1/CD31) and the integrin alphavbeta3 have been implicated in this process, and in vitro studies have identified alphavbeta3 as a heterotypic ligand for PECAM-1. In the present study we have addressed the roles of these molecules by investigating and comparing the effects of PECAM-1 and alphavbeta3 blockade on leukocyte migration in vivo. For this purpose we have examined the effects of neutralizing Abs directed against PECAM-1 (domain 1-specific, mAb 37) and beta3 integrins (mAbs 7E3 and F11) on leukocyte responses in the mesenteric microcirculation of anesthetized rats using intravital microscopy. The anti-PECAM-1 mAb suppressed leukocyte extravasation, but not leukocyte rolling or firm adhesion, elicited by IL-1beta in a dose-dependent manner (e.g., 67% inhibition at 10 mg/kg 37 Fab), but had no effect on FMLP-induced leukocyte responses. Analysis by electron microscopy suggested that this suppression was due to an inhibition of neutrophil migration through the endothelial cell barrier. By contrast, both anti-beta3 integrin mAbs, 7E3 F(ab')2 (5 mg/kg) and F11 F(ab')2 (5 mg/kg), selectively reduced leukocyte extravasation induced by FMLP (38 and 46%, respectively), but neither mAb had an effect on IL-1beta-induced leukocyte responses. These findings indicate roles for both PECAM-1 and beta3 integrins in leukocyte extravasation, but do not support the concept that these molecules act as counter-receptors in mediating leukocyte transmigration." @default.
• W1935192134 created "2016-06-24" @default.
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• W1935192134 date "2000-07-01" @default.
• W1935192134 modified "2023-10-01" @default.
• W1935192134 title "Divergent Effects of Platelet-Endothelial Cell Adhesion Molecule-1 and β3 Integrin Blockade on Leukocyte Transmigration In Vivo" @default.
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• W1935192134 doi "https://doi.org/10.4049/jimmunol.165.1.426" @default.
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