S-亚硝基谷胱甘肽对小鼠肠急性缺血再灌注损伤后肠屏障功能的影响

被引:3
作者
彭科
许超
于敏
孙力华
肖卫东
杨桦
机构
[1] 第三军医大学新桥医院普通外科
基金
国家自然科学基金重点项目;
关键词
S-亚硝基谷胱甘肽; 肠黏膜屏障; 紧密连接蛋白; 肠缺血再灌注;
D O I
暂无
中图分类号
R656 [腹部外科学];
学科分类号
100210 [外科学];
摘要
目的探讨S-亚硝基谷胱甘肽(GSNO)预处理对小鼠肠急性缺血再灌注(I/R)所致的肠黏膜屏障损伤的影响。方法6~8周龄雄性C57BL/6小鼠24只,分为Sham组、I/R组、I/R+GSNO组,每组8只。采用夹闭肠系膜上动脉30min,再灌注6h作为小鼠肠I/R模型。苏木素-伊红(HE)染色观察小肠组织形态学的变化;免疫组织化学观察肠上皮细胞间紧密连接蛋白claudin-1的表达情况;Western blot检测claudin-1蛋白水平变化。结果 HE染色显示,与Sham组比较,I/R组肠黏膜明显肿胀,绒毛部分脱落、变粗,绒毛倒伏、断裂,而I/R+GSNO组肠黏膜无明显肿胀,绒毛完整,形态接近正常;免疫组织化学观察显示I/R刺激可造成肠上皮表面claudin-1连续性明显破坏,阳性表达率明显降低,I/R+GSNO组肠上皮claudin-1连续性明显恢复,阳性染色显著增加;肠上皮claudin-1蛋白定量分析显示:与Sham组比较,I/R组及I/R+GSNO小肠上皮紧密连接蛋白claudin-1表达分别下降32.5%,13.8%(P<0.05);与I/R组比较,I/R+GSNO组小鼠肠上皮紧密连接蛋白claudin-1表达上调27.8%(P<0.05)。结论小肠急性I/R刺激可造成明显的肠黏膜损伤及肠上皮间紧密连接的显著破坏;GSNO预处理可通过上调claudin-1表达,有效缓解I/R对肠黏膜结构与肠上皮屏障功能的损伤。
引用
收藏
页码:724 / 726+729 +729
页数:4
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