Abstract
The purpose of this study was to evaluate if the venular neutrophil-endothelial adhesion associated with ischemia-reperfusion of skeletal muscle is dependent on leukocyte adhesion glycoprotein CD18 function and to determine if this interaction influences the vasoactive response in nearby arterioles. An in vivo microscopy preparation of transilluminated gracilis muscle in 13 male Wistar rats was used for this experiment. Observations of nonischemic muscle (sham) demonstrated this preparation to be stable for 8 hours with negligible change in neutrophil adherence or arteriole diameter. Three groups were evaluated in this study: (1) sham, no ischemia, no treatment (n = 5, 20 arterioles. 20 venules), (2) 4 hours of global ischemia only (n = 4, 19 venules, 22 arterioles), and (3) 4 hours of ischemia plus monoclonal antibody against CD18 (n = 4, 12 venules, 9 arterioles). The murine monoclonal antibody (WT.3, Seikagaku America, Inc.), which binds the rat leukocyte function antigen I CD18 chain, was infused into the contralateral femoral vein 30 minutes prior to reperfusion. The number of leukocytes rolling and adherent to endothelium (15 seconds of observation) was counted in 100-microns venular segments, and arteriole diameters were...Continue Reading
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