目的 探讨灯盏花在肠缺血再灌注(I/R)早期小肠黏膜屏障受损中的作用及其机制.方法 44只SD大鼠随机分为假手术组、肠I/R损伤(IIR)组、灯盏花处理(EB+IIR)组、L-NAME处理(LN+IIR)组.EB+IIR组在术前7 d腹腔注射灯盏花注射液20 mg/(kg·d),LN+IIR组在术前30 min尾静脉给予L-NAME(100 mg/kg)或等量生理盐水.夹闭肠系膜前动脉45 min后再灌注4 h.处死大鼠取标本,HE染色观察肠组织病理改变,ELISA检测肠黏膜SIgA和血浆内毒素水平,同时检测肠组织iNOS、eNOS和总NO表达水平.结果 肠I/R导致明显小肠机械屏障和免疫屏障受损,表现为肠黏膜SIgA含量下调,血浆内毒素水平提高,eNOS含量减少,iNOS/NO合成增加;灯盏花预处理可促进eNOS/NO合成,下调iNOS水平,减轻肠道损伤,提高肠黏膜SIgA含量并减轻血浆内毒素水平;当应用L-NAME HCI后,灯盏花的保护作用被取消.结论灯盏花注射液预处理通过促进eNOS/NO合成减轻I/R引起的小肠损伤.%Objective To investigate the effects of breviscapine injection on intestinal mucosal barrier damage induced by intestine ischemia-reperfusion (IIR). Methods 44 old SD rats were randomly divided into four groups:sham,intestine ischemia-reperfusion(IIR),EB+IIR,LN+IIR. Breviscapine injection 20 mg/(kg·d) was given intraperitoneally in EB+IIR group. L-NAME(100 mg/kg)was given intravenously 30 min before surgery in LN+IIR group. Rats were subjected to superior mesenteric artery occlusion consisting of 45 min of ischemia and 4 h of reperfusion;sham laparotomy served as controls. Intestine pathology was assayed by H&E staining. Concen-trations of SIgA,iNOS,eNOS and NO in intestinal mucosa,also endotoxine in plasma,were determined by ELI-SA. Results IIR induced serious intestinal mechanical and immune barrier damage ,evidenced as poor intestine pathology,depression of intestinal SIgA and eNOS levels,elevation of intestinal iNOS/NO levels. However,brevis-capine injection pretreatment could promote eNOS/NO production ,down-regulated iNOS expression ,leading to ele-vating SIgA concentration in intestine ,attenuate endotoxemia induced by IIR. The protection was canceled when application of L-NAME. Conclusion Breviscapine pretreatment attenuates ischemia-reperfusion-induced intestinal mucosal barrier damage via promoting eNOS/NO production.
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