动力相关蛋白和视神经萎缩症蛋白在高氧诱导早产鼠肺损伤中的作用

Role of DRP1 and OPA1 in hyperoxia induced lung injury of premature rats

目的研究动力相关蛋白(DRP1)和视神经萎缩症蛋白(OPA1)在高氧诱导早产大鼠肺损伤时细胞凋亡中的作用。方法随机将早产Wistar大鼠48只分为高氧组(吸入95%的氧)和对照组(吸入21%氧)。1、3、7d分批离断早产鼠处死后取肺组织做石蜡切片。观察早产鼠肺组织的病理学变化及线粒体形态变化相关的蛋白;评价各组早产大鼠肺组织细胞凋亡情况。结果DRP1和OPA1表达于肺组织细胞的胞质,与对照组相比,高氧组DRP1/OPA1的表达呈时间依赖性,1d时开始增加,7d时表达最高;高氧组1d时OPA1表达有所减少,7d最少;高氧组1d时DRP1表达开始增加,7d时表达显著升高。高氧组可见大量末端转移酶标记技术(TUNEL)阳性细胞,随着高氧暴露时间延长,凋亡指数呈逐渐增高趋势。7d时凋亡细胞数达高峰。在高氧组,DRP1/OPA1比值表达与细胞凋亡指数相比,呈显著正相关(r=0.725,P<0.01)。结论高氧暴露可致早产鼠肺组织产生时间依赖急性肺损伤改变。

Objective To investigate the role of DRP1 and OPA1 in the process of apoptotic in hyperoxia induced lung injury of premature rats .Methods 48 premature Wistar rats were divided into control group in which rats were exposed tO 210 ml .L 1 oxy-en ,and hyperoxia group in which Rats were exposed to 950 mL .L 1 oxyen .The lung tissues of 2 groups were gained on the first day ,the second day and the seventh day with which that all mice were killed by cutting neck .Section of lungs were stained with hea-toxylin eosin to observe the pathological changes ,the protein expression in the lung cells which were linked with the change of plas-tosome ,then the premature rat lung tissue apoptosis in each group were evaluated .Results Compored with the contnx group ,the expression level of OPA1 in the hyperoxia group began to decrease on the first day and apparently decreased to the buttom line on the seventh day .On the other hand ,DRP1 in hyperoxia group began to increase on the first day ,while reached the summit on the seventh day .A few of TUNEL positive cells began to increase with time dependence .A lot of TUNEL positive cells could be found in hyperoxia group ,and the apoptotic index reached the peak on the 7 d .There is a significantly positive correlation between the cell apoptosis and the ratio change of DRP1 and OPA1 in high oxygen group（r=0 .725 ,P〈0 .01） .Conclusion The classical pathologic characters of lung injury were found out in hyperoxia group ,and it changed obviously with time .