前列腺素E1预处理对失血性休克复苏后大鼠肝损伤的保护作用

目的 探讨前列腺素El脂微球制剂(Lipo-PGEl)预处理对失血性休克复苏后大鼠肝损伤的保护作用及机制.方法 32只健康雄性SD大鼠随机(随机数字法)分为4组(n=8),A:假手术组;B:休克组,休克90 min后处死;c:失血性休克复苏组,大鼠麻醉后,经股动脉穿刺置管放血,使平均动脉压(MAP)降至(35±5)mmHg,维持90 min,回输自体血液复苏,维持MAP 80-100 mmHg,制作失血性休克复苏模型;D:失血性休克复苏+Lipo-PGEl预处理组,Lipo-PGEl按10 μg/kg溶于0.5mL生理盐水从股静脉注射,1h后制作失血性休克复苏模型.C组和D组于复苏后6 h取血测肝功及NO、ET-1,HE染色观察肝组织病理变化,免疫组化检测肝组织iNOS和ET-1的表达.数据采用单因素方差分析,以P<0.05为差异具有统计学意义.结果 失血性休克复苏组肝脏发生严重缺血-再灌注损伤,ALT,AST,LDH及NO,ET-1较休克组均有不同程度升高(P<0.05),肝组织iNOS和ET-1的表达显著高于休克组(0.225±0.080)vs.(0.082±0.021),(0.292±0.047)vs.(0.082±0.035),P<0.05];预先给药组肝脏病理损伤较模型组轻,ALT,AST,LDH及NO,ET-1较模型组均有不同程度降低(P

Abstract：

Objective To observe the effects and mechanism of pretreatment in rats with prostaglandin E1 on liver after hemorrhagic shock and resuscitation(HSR).Method In total,32 male SD rats were randomly(random number)divided into four groups(n=8):group A(sham group),group B(shock group),group C(HSR group)and group D(Lipo-PGEl+HSR).In group B,rats were sacrificed 90 min after shock,and in group C,rats were anesthetized and then subjected to hemorrhagic shock followed by resuscitation.In group D,rats were pretreated with Lipo-PGEI one hour before HSR.Liver function,NO and ET.1 were measured,and pathological changes of liver tissue in each group were observed,and the expres8ions of iNOS and ET.1 of liver tissue were measured by using immunohistochemistry 6 hours after HSR.Data were analyzed by analysis of variance,and P<0.05 was considered as significantly different in statitistics.Results The levels of liver iNOS and ET-I increased in HSR group compared with shock group (O.225±0.080)vs.(0.082±0.021)and(0.292±0.047)vs.(0.082±0.035),P<0.05].Pretreatment with Lipo-PGEl markedly reduced the damage of Liver function,and lowered the levels of NO and ET-I.which were consistent with decrease in iNOS and ET-16 hours after HSR(0.116±0.034)vs.(0.225±0.080)and(0.198±0.041)vs.(0.292±0.047),P<0.05].Conclusions Pretreatment with Lipo-PGEl could reduce liver injury after HSR.The mechanisms might be attributed to inhibiting iNOS and ET-1,regulating the balance of NO/ET-I.

The protective effects of pretreatment with Lipo-PGE1 on fiver injury after hemorrhagic shock and resuscitation in rats

Objective To observe the effects and mechanism of pretreatment in rats with prostaglandin E1 on liver after hemorrhagic shock and resuscitation(HSR).Method In total,32 male SD rats were randomly(random number)divided into four groups(n=8):group A(sham group),group B(shock group),group C(HSR group)and group D(Lipo-PGEl+HSR).In group B,rats were sacrificed 90 min after shock,and in group C,rats were anesthetized and then subjected to hemorrhagic shock followed by resuscitation.In group D,rats were pretreated with Lipo-PGEI one hour before HSR.Liver function,NO and ET.1 were measured,and pathological changes of liver tissue in each group were observed,and the expres8ions of iNOS and ET.1 of liver tissue were measured by using immunohistochemistry 6 hours after HSR.Data were analyzed by analysis of variance,and P<0.05 was considered as significantly different in statitistics.Results The levels of liver iNOS and ET-I increased in HSR group compared with shock group (O.225±0.080)vs.(0.082±0.021)and(0.292±0.047)vs.(0.082±0.035),P<0.05].Pretreatment with Lipo-PGEl markedly reduced the damage of Liver function,and lowered the levels of NO and ET-I.which were consistent with decrease in iNOS and ET-16 hours after HSR(0.116±0.034)vs.(0.225±0.080)and(0.198±0.041)vs.(0.292±0.047),P<0.05].Conclusions Pretreatment with Lipo-PGEl could reduce liver injury after HSR.The mechanisms might be attributed to inhibiting iNOS and ET-1,regulating the balance of NO/ET-I.