大鼠严重烧伤早期心肌线粒体通透性转换孔状态改变及其机制  

Changes of myocardial mitochondrial permeability transition pore and its mechanism in the early stage after severe burns

作　　者：梁晚益[1] 黄跃生[1] 杨宗城[1] 

机构地区：[1]第三军医大学附属西南医院全军烧伤研究所

出　　处：《第三军医大学学报》2003年第18期1606-1608,共3页Journal of Third Military Medical University

基　　金：国家重点基础研究发展规划资助项目 ("973"项目 ) (G19990 54 2 0 2 ) ;国家杰出青年科学基金资助项目 ( 30 12 50 4 0 ) ;全军"十五"指令性课题 ( 0 1L0 6 6 ) ;教育部高等学校骨干教师资助计划项目 ( 2 0 0 0 ) ;军队首批临床高新技术重大项目 ( 2 0 0

摘　　要：目的　探讨大鼠严重烧伤早期心肌线粒体通透性转换孔 (PTP)状态改变及其机制。方法　Wistar大鼠 48只随机分为正常对照组、烧伤 1、3、6、12、2 4h组 ( 3 0 %Ⅲ度烫伤 )。所有大鼠处死前 5min均从颈外静脉推注 0 .5mmol L 2 [3H]去氧葡糖 ( [3H]DOG) ,测定伤后各组大鼠心肌线粒体 [3H]DOG、cytc、MDA含量及 [Ca2 + ] m。结果　①大鼠烧伤后 1h心肌线粒体 [3H]DOG及cytc含量与正常对照组无明显差异 ,但 3、6、12、2 4h心肌线粒体 [3H]DOG含量明显高于正常对照组 ,cytc含量明显低于对照组 ,分别是对照组的 68 8%、5 0 .0 %、77.1%、72 .9%。②大鼠烧伤后 3、6、12、2 4h心肌线粒体MDA含量及 [Ca2 + ] m 显著高于正常对照组。③伤后心肌线粒体 [3H]DOG含量与 [Ca2 + ] m 、MDA均呈显著正相关 ,相关系数分别为 0 .85 47、0 .9117(P <0 .0 1)。结论　烧伤后 1h心肌线粒体PTP状态无明显改变 ,但伤后 3、6、12、2 4hPTP开放明显增加 ,线粒体Ca2 +Objective To investigate the changes of myocardial mitochondrial permeability transition pore(PTP) and its mechanism in the early stage after severe burns. Methods An experimental model of 30% TBSA full thickness skin scalding was established in rats. All rats were injected with deoxyglucose(DOG) before sacrifice. Myocardial mitochondrial DOG and cytochrome c content, Ca 2+ concentration([Ca 2+ ] m) and MDA content were determined. Results ① There were no obvious changes of mitochondrial DOG and cytochrome c content at 1 h after burns, but mitochondrial DOG increased evidently at 3, 6, 12 and 24 h after burns. Meanwhile, cytochrome c content was significantly lower than that of the control, being 68.8%, 50.0%, 77.1% and 72.9% of that in the control, respectively. ② [Ca 2+ ] m and MDA content were significantly higher than those of the control at 3, 6, 12 and 24 h after burns. ③ Mitochondrial DOG content was positively correlated with [Ca 2+ ] m and MDA content, respectively, after burns. Conclusion There is no obvious change in myocardial mitochondrial permeability transition pore, but PTP opening increases markedly at 3, 6, 12 and 24 h after burns. Mitochondrial Ca 2+ overloading and increase in free radicals may be the cause leading to PTP opening.

关 键 词：烧伤 线粒体 通透性转换孔 心肌 

分 类 号：R322.11[医药卫生—人体解剖和组织胚胎学] R329.27[医药卫生—基础医学]