[A role of platelet activating factor in experimental hemorrhagic enteritis induced by Clostridium difficile toxin]

Clostridium difficile is thought to be an important causative agent of antibiotics associated colitis. However its mechanisms are not fully understood. The present study was designed to elucidate the effect of PAF and free radicals on experimental hemorrhagic enteritis induced by Clostridium difficile toxin. PAF concentration in the portal blood and accumulated fluid, disturbance of the vascular endothelial cells in the ligated jejunal loops and chemiluminescence activity of WBC in the control group's rats increased from 4 hrs over 10 hrs after the administration of Clostridium difficile toxin. On the other hand, the amount of fluid accumulation, protein concentrations in the accumulated fluids, histological changes in the ligated jejunal loops of toxin administered rats and chemiluminescence activity of WBC were significantly suppressed by PAF antagonist (CV6209:TAKEDA). These results suggest that PAF and free radicals may have some role in microcirculatory disturbance and hyperpermeability of the blood vessels in the intestine of hemorrhagic enteritis induced by Clostridium difficile toxin.