复方苹果酸钠对失血性休克大鼠小肠黏膜细胞凋亡的影响

摘要

目的 观察复方苹果酸钠对失血性休克大鼠小肠黏膜细胞凋亡的影响.方法 雄性SD大鼠48只,体重280~320 g,随机分为假手术组(SS组)、生理盐水组(NS组)、复方乳酸钠组(RL组)和复方苹果酸钠组(RM组),每组12只.SS组为空白对照组,其余三组制作失血性休克模型,放血至MAP降为(40±5)mm Hg,休克60 min后进行对应液体复苏,复苏后3 h处死大鼠.检测小肠黏膜中B淋巴细胞瘤-2基因(Bcl-2)表达量和Bcl-2相关蛋白(Bax)含量,采用TUNEL法检测黏膜细胞凋亡情况,计算凋亡指数.检测小肠组织中超氧化物歧化酶(SOD)活性和丙二醛(MDA)浓度.取小肠黏膜做病理切片,观察病理改变.结果 NS、RL、RM组Bcl-2表达量明显低于SS组,Bax含量及凋亡指数明显高于SS组(P<0.05);RM组Bcl-2表达量明显高于NS组和RL组,Bax含量及凋亡指数明显低于NS组和RL组(P<0.05).NS、RL、RM组SOD活性明显低于SS组,MDA浓度明显高于SS组(P<0.05);RM组SOD活性明显高于NS组和RL组,MDA浓度明显低于NS组和RL组(P<0.05).病理组织切片显示RM组小肠黏膜损伤轻于NS组和RL组. 结论 复方苹果酸钠对于失血性休克大鼠小肠黏膜具有良好的抗凋亡作用,为临床晶体液的应用带来新的选择.%Objective To test the protective effect of a new Ringer's malate solution on intestine's apoptosis caused by hemorrhagic shock in rats.Methods Forty-eight Sprague-Dawley male rats, weighing 280-320 g, were randomly assigned into four groups: sham shock group (group SS), normal saline group (group NS), Ringer's lactate group (group RL) and Ringer's malate (group RM), n=12 each.The group SS was served as control group, the other groups were subjected to 60 min of hemorrhagic shock followed by crystalloid resuscitation.Those rats were sacrificed 3 h after resuscitation.Intestinal tissue was harvested to detect Bcl-2/Bax protein level, the bioactivity of superoxide dismutase (SOD) and malondialdehyde (MDA) level.The level of intestinal cell apotosis was measured using TUNEL method and apoptosis index was calculated.The intestinal histopathology was examined.Results Compared with group SS, the expression of Bcl-2 and the bioactivity of SOD were lower, the level of Bax protein, MDA and apoptotic index were higher in groups NS, RL and RM (P<0.05).Compared with groups NS and RL, the expression of Bcl-2 and the bioactivity of SOD was higher, the level of Bax protein, MDA and apoptotic index were lower in group RM (P<0.05).Histopathological examination showed that group RM was better than group NS and group RL.Conclusion Ringer's malate alleviated intestinal apoptosis caused by hemorrhagic shock in rats.The study suggests that Ringer's malate solution could be a potential new therapeutic agent for fluid resuscitation.