Pretreatment but not treatment with probiotics abolishes mouse intestinal barrier dysfunction in acute pancreatitis

Background. Intestinal barrier failure during acute pancreatitis (AP) is associated with translocation of luminal bacteria, resulting in infectious complications. We examined the effects of multispecies probiotics on the intestinal barrier impairment in a murine model of AP. Methods. Mice were injected with cerulein to induce AP and were sacrificed 11(early AP) or 72 hours (late AP) after start of induction, AP and associated systemic effects were confirmed by histology of pancreas and lung. Animals received daily probiotics starting 2 days prior to AP induction (Pretreatment) or tit the moment of AP induction (treatment). Mucosal barrier function of the distal ileum was assessed in Ussing chambers by measurement of the epithelial electrical resistance and the permeability to Na-fluorescein. Results. Histological analysis revealed pancreatic injury in both phases of AP and lung damage in the earls phase. Epithelial resistance of the ileum was reduced and permeability increased in both phases of AP indicating impairment of the intestinal barrier. Pretreatment had no effect oil resistance or permeability in the early phase of AP. In the late phase of AP, pretreatment but not treatment abolished the AP induced resistant e decrease and permeability increase. Administration of probiotics as such (ie, without induction of AP) had no effect on intestinal barrier function. Conclusion. Pretreatment with multispecies probiotics for 2 days abolishes intestinal barrier dysfunction in the late phase of AP while treatment does)lot. The effectiveness of probiotics in this model depends oil the timing of administration. Clinical trials with probiotics should seek conditions where treatment call be started prior to onset of disease or elective surgical intervention. (Surgery 2009,145:157-67.)