摘要:
目的 探讨Neuritin与HSP60在肝损伤修复过程中的表达变化以及可能的分子机制,为研究肝损伤修复提供实验基础.方法 将48只Sprague-Dawley(SD)大鼠,随机分为空白组(n=6)和实验组(n=42),空白组不做任何处理,实验组均行70%肝左叶切除以诱导急性肝损伤,并于术后6、12、24、48 h和3、7、14 d再次切除残余肝左叶,采用免疫印迹技术(Western blot)检测Neuritin与HSP60在相应时间点肝组织中的表达变化差异,行苏木精-伊红染色(HE)观察各时间点肝脏病理学改变,同时于尾缘静脉采血检测ATL和AST水平变化.结果 (1)与空白组相比,实验组于术后6、12、24、48 h血清ALT、AST含量持续增高并于48 h达到高峰,3 d开始降低、7 d几乎接近正常,差异具有统计学意义(P<0.05).病理学提示:与空白组相比,实验组肝小叶结构排列紊乱,气球样变明显,在术后48 h最为明显;(2)在肝损伤修复的整个过程中,Neuritin与HSP60的表达变化呈现截然相反的差异,Neuritin的表达与肝损伤的加重或修复存在显著的负相关性(P<0.001),并且在肝损伤最重的48 h时其表达量最低;HSP60的表达与肝损伤的加重或修复存在显著的正相关性(P<0.001),并且在肝损伤最重的48 h时其表达量最高.结论 (1)采用单纯性70%肝左叶切除术,成功建立了SD大鼠的肝损伤修复模型,其损伤在术后第48小时最重,该方法造模成功率为100%(42/42),操作简单、实用性强,为研究肝再生、肝损伤、肝移植等提供了一种可靠且简便的动物模型;(2)Neuritin的表达在肝损伤后逐渐降低,并在第48小时达到最低,而HSP60的表达逐渐升高,并在第48小时达到最高;(3)Neuritin与HSP60的表达变化与肝损伤修复过程密切相关(P<0.001),呈现出一定变化规律,两者可能通过某种相互作用而产生相应的生物效应,共同参与并促进了肝损伤的再生修复.%Objective To explore the expression changes and possible molecular mechanisms of Neuritin and HSP60 during the repair of liver injury,and to provide an experimental basis for the study of the repair of liver injury. Methods Forty-eight Sprague-Dawley(SD)rats were randomly divided into control group without any treatment(n=6)and experimental group(n=42)underwent 70% hepatectomy to induce acute liver injury,and 6 h,12 h,24 h,48 h,3 d,7 d and 14 d after the operation,the left lobe resection of the residual liver was per-formed. Immunoblotting technique (Western blot) was used to detect the expression difference of Neuritin and HSP60 in liver tissue of the corresponding time points. Hematoxylin eosin staining(hematoxylin-eosin staining, HE)was used to observe the expression changes at each time point in liver pathology,and tail vein blood to detect ATL and AST changes. Results (1)Compared with those in the control group,the serum ALT and AST levels in the experimental group were increased at 6 h,12 h,24 h and 48 h after the operation,and reached the peak at 48 h postoperatively but those began to decrease 3 d postoperatively and was almost normal 7 d postoperatively. The difference was statistically significant(P < 0.05). Pathological findings:compared with that in the control group, the hepatic lobule structure in the experimental group was disorderly. The obvious balloon like change reached the peak 48 h postoperatively.(2)In the whole process of repair of liver injury,the expression of Neuritin and HSP60 showed differences in the opposite. There was a significantly negative correlation between Neuritin expression and the repair or the aggravation of the injury(P<0.001)and the lowest expression was observed 48 h postoperatively. There was a significantly positive correlation between HSP60 expression and the repair or the aggravation of the injury(P < 0.001)and the highest expression was observed 48 h postoperatively. Conclusions (1)With simple 70% left hepatic lobectomy,the repair of liver injury model of SD rats is successfully established and the heaviest injury is observed 48h postoperatively. With a high success rate(100%,42/42),simple and practical,the method provides a reliable and convenient animal model for the study of liver regeneration,liver injury and liver transplan-tation.(2)The expression of Neuritin decreases gradually after liver injury and reaches the lowest 48 h postopera-tively,while the expression of HSP60 increases gradually and reaches the highest 48 h postoperatively.(3)The change of expression of Neuritin and HSP60 is closely related to the process of liver injury repair(P < 0.001), showing a certain change rule. They may have some biological effects through interactions,and participate in and promote the regeneration and repair of liver injury.