Abstract
We attempted to define the putative role of complement activation in association with mucosal mast cell (MMC) degranulation in the pathogenesis of rapid intestinal ischaemia-reperfusion (I/R) injury. We prepared complement activity-depleted rats by the administration of the anti-complement agent K-76COOH and the serine-protease inhibitor FUT-175. Autoperfused segments of the jejunum were exposed to 60 min of ischaemia, followed by reperfusion for various time periods, and the epithelial permeability was assessed by the 51Cr-EDTA clearance rate. The number of MMC was immunohistochemically assessed. In control rats, the maximal increase in mucosal permeability was achieved by 30-45 min of reperfusion. This increase was significantly attenuated by the administration of either K-76COONa alone or in combination with FUT-175. In contrast, the administration of carboxypeptidase inhibitor (CPI), which prevents the inactivation of complement-derived anaphylatoxins such as C5a, significantly enhanced the increase in I/R-induced mucosal permeability. These findings were confirmed morphologically by light microscopy and scanning electron microscopy. In addition, the I/R-induced mucosal injury was accompanied by a marked decrease in the num...Continue Reading
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