The leukocyte adhesion molecule L-selectin mediates neutrophil adhesive interactions with endothelial cells and is in part responsible for neutrophil rolling. We examined the role of L-selectin in ischemia- reperfusion injury of rabbit ears using a monoclonal antibody (MoAb) directed to a functional epitope of L-selectin. Arterial blood flow to the rabbit ear was occluded for six hours with ambient temperature at 23 degrees C to 24 degrees C. Rabbits were treated at reperfusion with saline (n = 8), the L-selectin function-blocking LAM1–3 MoAb (2 mg/kg), or the nonfunction-blocking LAM1–14 MoAb (2 mg/kg). Tissue injury was determined by measuring edema and necrosis. Edema in the LAM1–3 MoAb- treated group (peak = 25 +/- 4 mL) was significantly less (P < .05) than in saline-treated (peak = 40 +/- 8 mL) and LAM1–14 MoAb-treated (peak = 41 +/- 6 mL) groups. Tissue necrosis at 7 days was not observed in the LAM1–3 MoAb-treated group, whereas significant necrosis (P < .05) was seen in the saline- (8% +/- 3% necrosis) and LAM1–14 MoAb- treated (7% +/- 3% necrosis) group. We conclude that blocking L- selectin ameliorates necrosis and edema after ischemia and reperfusion in the rabbit ear, presumably by blocking neutrophil rolling.

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