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Department of Pharmacology and Therapeutics, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
Proteinase-activated receptor 2 (PAR2) has been suggested to play a role in inflammatory reactions. Because leukocyte-endothelial cell interactions are critical events during inflammatory reactions, and because PAR2 is expressed both on endothelium and leukocytes, we have examined the effects of PAR2-activating peptides (PAR2-APs) on leukocyte rolling and adhesion in mesenteric venules and on leukocyte recruitment into the peritoneal cavity. Using intravital microscopy, leukocyte rolling, flux, and adhesion in rat mesenteric postcapillary venules were quantified. Topical addition of PAR2-APs (10 µM) for 1 min to the superfused venule induced a significant increase in leukocyte rolling and adherence. The increase in leukocyte adherence was not affected by pretreatment with a mast cell stabilizer (sodium cromoglycate) nor by prior degranulation of mast cells with compound 48/80. Nonetheless, both leukocyte rolling and adhesion were completely inhibited by pretreatment with a platelet-activating factor receptor antagonist (WEB 2086). Intraperitoneal injections of a selective PAR2-AP (SLIGRL-NH2) caused a significant increase in leukocyte migration into the peritoneal cavity. The effect of SLIGRL-NH2 on peritoneal leukocyte infiltration was completely inhibited by WEB 2086. These data suggest that PAR2 activation could contribute to several early events in the inflammatory reaction, including leukocyte rolling, adherence, and recruitment, by a mechanism dependent on platelet-activating factor release.
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