血管扩张刺激磷蛋白在失血性休克肠屏障功能障碍中的作用

目的 观察大鼠小肠上皮血管扩张刺激磷蛋白(vasodilator stimulated phosphoprotein,VASP)在失血性休克肠屏障功能障碍中的作用.方法 实验分为正常组、休克1、2、4 h组及休克2 h+环磷腺苷组,每组8只.测定各组血清二胺氧化酶(diamine oxidase,DAO)活性、血浆D-乳酸含量,并观察其与VASP表达的关系.结果 VASP磷酸化激动剂环磷腺苷可明显增强失血性休克2 h时VASP表达,降低血清DAO活性和血浆D-乳酸含量,与未加环磷腺苷组比较差异有统计学意义(t=18.62,9.28,2.83,P<0.05).失血性休克后大鼠血清DAO活性显著增高,而VASP表达明显降低,两者旱负相关(r=-0.95,P<0.05).结论 VASP降低是导致失血性休克大鼠肠屏障功能障碍的因素.环磷腺苷能改善肠屏障功能障碍.

Effects of vasodilator stimulated phosphoprotein on intestinal barrier dysfunction after hemorrhagic shock in rats

Objective To observe the effects of vasedilator stimulated phosphoprotein (VASP) of small intestine mucous membrane on the intestinal barrier dysfunction during hemorrhagic shock (HS) in rats. Methods Forty Wistar rats were divided into normal group, HS 1 hour, HS 2 hours and HS 4 hours groups, as well as HS 2 hours + cyclic adenosine monophosphate (cAMP) treatment group. The activity of sermn diamine oxidase (DAO), content of hematoplasma D-lactic acid of each group were determined, and their relationship with the expression of VASP was analyzed. Results The expression of VASP was increased, serum DAO activity and hematoplasma D-lactic acid content were decreased by cAMP in rats at 2 hours after HS. There were differences upon the levels of VASP expression, DAO activity and hematoplasma D-lactic acid content between HS 2 hours group and HS 2 hours + cAMP treatment group ( t = 18.62, 9.28, 2.83, P < 0.05 ). The serum DAO activity increased while VASP expression decreased significantly after HS, which showed an obvious negative correlation between the two indexes (r=-0.95, P<0.05). Conclusions The decrease of VASP contributes to the intestinal barrier dysfunction after HS in rats, while the intestinal barrier dysfunction can be alleviated by cAMP.