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Comparative Study
Journal Article
Research Support, U.S. Gov't, P.H.S.
Blockade of L-selectin attenuates reperfusion injury in a rat model.
Journal of Reconstructive Microsurgery 2000 April
Ischemia/reperfusion (I/R) injury appears to be a significant neutrophil-dependent component and may be ameliorated by blocking leukocyte-endothelial adhesion. Using a rat extensor digitorum longus (EDL) muscle model, the present study tested the hypothesis that in vivo administration of the function-blocking monoclonal antibody (mAb) LAM1-116 which recognizes L-selectin, a cell-surface adhesion receptor, could decrease I/R injury. In 46 rats, one EDL served as a normal control and the opposite EDL underwent 3 hr of ischemia followed by 3 hr of reperfusion after pretreatment with LAM1-116 mAb, control IgG, or saline. Myeloperoxidase (MPO) activity showed only a two-fold increase from normal in LAM1-116-treated I/R EDL while a 27-fold increase occurred in the IgG2a and saline groups, with a statistically significant (p < 0.001) difference. A significantly (p < 0.05) lower wet weight ratio, improved fatigue contractile force, and less neutrophil infiltration were found in LAM1-116-treated EDL, when compared to those in control IgG- or saline-treated EDL. The results indicate that blockade of L-selectin by LAM1-116 mAb can effectively reduce neutrophil infiltration in reperfused skeletal muscle, thereby decreasing tissue edema and improving muscle fatigue contractile force. These findings may be important in understanding I/R injury.
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