大鼠压疮早期的线粒体损伤

摘要

目的 探讨大鼠压疮早期引起的线粒体损伤情况及其作用.方法 将40只大鼠随机分为5组(每组8只).对照组(control组)大鼠不施压;实验组用特制压力装置对股薄肌处施压(170 mmHg)2 h,放松0.5 h为一个循环(1C),根据施压循环不同又分为3C、6C、9C和12C组.HE染色法观察受压肌肉组织的病变;Western blot检测Bcl-2和Bax在受压肌肉组织中的表达;透射电镜观察肌纤维和线粒体等超微结构.结果 各实验组随着受压循环的增加出现病理损伤并逐渐加重;与对照组相比各实验组中Bcl-2的表达均有显著增加(P<0.05),于3C组达到高峰,随后下降;随着受压循环的增加Bax的表达逐渐增多(P<0.05),于12C组达到高峰;各实验组随着受压循环的增加肌纤维出现排列紊乱和溶解断裂,线粒体嵴消失及空泡变性等逐渐加重的病理损伤.结论 大鼠压疮早期发生了线粒体损伤并诱导了细胞凋亡.%Objective To investigate the mitochondrial damage and its effect in early stage of pressure ulcer in rats.Methods Forty rats were randomly divided into 5 groups(n=8), control group(Con group) rats without stress, the experimental group was treated with of 170 mmHg for 2 h and relax 0.5 h as one cycle(1C), experi-mental group was divided into 3C, 6C, 9C and 12C group.The pathological changes of the compressed muscle tissue of the rats in each group were observed by HE staining , Western blot was used to detect the expression of Bcl-2 and Bax in the compressed tissue , and the ultrastructure of muscle fibers and mitochondria were observed by transmission electron microscope .Results There were pathological damage and gradually increased in the ex-perimental groups, with the increase of compression cycle; the expression of Bcl-2 in each experimental group was significantly increased as compared with the control group(P<0.05), in the 3C group reached the peak, and then decreased; the expression of Bax was increased gradually with the increase of compression cycle ( P<0.05) , and in the 12C group reached the peak;with the increase of the compression cycle the muscle fibers of each experimental group appeared gradually increased pathological damage:disorder, dissolution and fracture, the ridge of the mitochondria disappeared, vacuolar degeneration, et al.Conclusions In the early stage of pres-sure ulcer in a rat , it brings occurred mitochondrial damage and induces apoptosis .