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

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. Key words: PGE1; Hemorrhagic shock; Ischemia reperfusion injury; Liver