非酒精性脂肪性肝炎大鼠肠道分泌液sIgA的变化

目的探讨非酒精性脂肪性肝炎形成过程中小肠分泌液sIgA和血浆内毒素水平的变化。方法 32只SD大鼠随机均分为对照组和模型组,对照组用普通饲料喂养,模型组通过高脂饮食建立大鼠非酒精性脂肪性肝炎（non-alcoholic steatohepatitis,NASH）模型,并分别在8、12周末处死每组大鼠各8只,测定大鼠小肠分泌液中sIgA的水平和门静脉血浆中内毒素水平,测定小肠组织匀浆中SOD的活性和MDA的含量,并测定大鼠血清中TG、TC、ALT、AST,HE染色观察肝脏病理改变。结果 8、12周模型组较正常对照组大鼠血清TC、ALT、AST明显升高（P〈0.05）,肝脏病理分别表现为单纯性脂肪肝、脂肪性肝炎。8周末时模型组大鼠门静脉血浆中内毒素、小肠分泌液中sIgA的水平与对照组相比无明显变化（P〉0.05）;12周末大鼠NASH阶段与对照组相比小肠分泌液中sIgA的水平明显降低（P〈0.05）,门静脉血浆中内毒素水平与对照组相比明显升高（P〈0.05）。并且门静脉血浆内毒素水平与小肠分泌液中sIgA水平呈负相关（r=-0.873,P〈0.05）。8、12周末时模型组大鼠小肠组织匀浆中SOD活性明显降低,MDA含量明显升高（P〈0.05）。结论非酒精性脂肪性肝炎形成过程中小肠分泌液中sIgA明显降低,说明肠道免疫屏障受损,并且可能与肠道脂质过氧化增强有关,可能是NASH发生发展的重要发病机制之一。

Changes of sIgA of intestinal mucosal fluid in the progress of non-alcoholic steatohepatitis in rats

Objective To explore the changes of sIgA of intestinal mucosal fluid and serum levels of endotoxin in the progress of non-alcoholic steatohepatitis(NASH) in rats.Methods Thirty-two SD rats were randomly divided into control group and model group.The rats in control group were fed with normal diet.The rats in model group were fed with fat-rich diet to establish the model of non-alcoholic steatohepatitis.The 8 rats in each group were killed at the end of 8th,12th week respectively.The serum level of endotoxin...