袖状胃切除术对高脂饮食诱导肥胖大鼠肠道屏障的影响

摘要

Objective To investigate the effect of sleeve gastrectomy on the intestinal barrier of obesity rats fed with high-fat diet.Methods Thirty obesity rats fed with high-fat diet were randomly divided into three groups including common diet group (CD,n=10),sham operation group (SO,n=10) and sleeve gastrectomy group (SG,n=10).The lactulose/mannitol ratios (L/M) in 24-hour urine and endotoxin in portal vein were evaluated four weeks after surgery.The levels of tight junction proteins including claudin-1 and occludin in intestinal mucosa were analyzed by western blot.Results The body weight of SG group was significantly decreased than those of CD group (P<0.001) and SO group (P<0.001) four weeks after surgery.The L/M ratio in 24-hour urine of SG group was significantly lower than those of CD group (P<0.001) and SO group (P<0.01).The endotoxin level in portal vein of SG group was significantly lower than those of CD group (P<0.01) and SO group (P<0.05).The claudin-1 level in intestinal mucosa of SG group was significantly higher than those of CD group (P<0.001) and SO group (P<0.01) four weeks after surgery.The occludin level in intestinal mucosa of SG group was significantly higherthan those of CD group (P<0.001) and SO group (P<0.001).Conclusions Sleeve gastrectomy can reduce body weight,L/M ratio in 24-hour urine and endotoxin level in portal vein of obesity rat fed with high-fat diet and increase the levels of claudin-1 and occludin in intestinal mucosa.%目的 研究袖状胃切除术对高脂饮食诱导肥胖大鼠肠道屏障的影响.方法 建立高脂饮食诱导肥胖大鼠模型共30只,随机分为普通饮食组(CD,n=10)、假手术组(SO,n=10)和袖状胃切除组(SG,n=10),术后4周时分别检测24 h尿乳果糖/甘露醇比值(L/M)、门静脉血清内毒素水平和小肠黏膜紧密连接蛋白claudin-1和occludin表达水平.结果 术后4周时,SG组大鼠体质量明显低于CD组(P<0.001)和SO组(P<0.001).SG组大鼠24 h尿L/M值明显低于CD组(P<0.001)和SO组(P<0.01).SG组门静脉血清内毒素水平明显低于CD组(P<0.01)和SO组(P<0.05).术后4周时,SG组大鼠小肠黏膜中claudin-1表达水平明显高于CD组(P<0.001)和SO组(P<0.01),occludin表达水平明显高于CD组(P<0.001)和SO组(P<0.001).结论 袖状胃切除术可使高脂饮食诱导的肥胖大鼠体质量下降,降低24 h尿L/M值和门静脉血清内毒素水平,提高小肠黏膜中claudin-1和occludin蛋白的表达水平.