中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (11): 1714-1719.doi: 10.3969/j.issn.2095-4344.2502

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

运动预适应与力竭运动大鼠心肌损伤:Rho/ROCK信号通路的作用

刘晓晨1,王改凤2   

  1. 1河南财政金融学院体育系,河南省郑州市  450046;2河南省中医院脑病一病房,河南省郑州市  450002
  • 收稿日期:2019-04-11 修回日期:2019-04-19 接受日期:2019-07-26 出版日期:2020-04-18 发布日期:2020-02-28
  • 通讯作者: 王改凤,硕士,主治医师,河南省中医院脑病一病房,河南省郑州市 450002
  • 作者简介:刘晓晨,男,1981年生,河南省郑州市人,汉族,2006年郑州大学毕业,硕士,讲师,主要从事运动医学方面的研究。
  • 基金资助:
    河南省体育局课题研究项目(2018026)

Exercise preconditioning for myocardial injury in rats after exhaustive exercise based on Rho/ROCK pathway

Liu Xiaochen1, Wang Gaifeng2   

  1. 1Department of Physical Education, Henan University of Finance and Economics, Zhengzhou 450046, Henan Province, China; 2First Ward of Encephalopathy, Henan Hospital of Traditional Chinese Medicine, Zhengzhou 450002, Henan Province, China
  • Received:2019-04-11 Revised:2019-04-19 Accepted:2019-07-26 Online:2020-04-18 Published:2020-02-28
  • Contact: Wang Gaifeng, Master, Attending physician, First Ward of Encephalopathy, Henan Hospital of Traditional Chinese Medicine, Zhengzhou 450002, Henan Province, China
  • About author:Liu Xiaochen, Master, Lecturer, Department of Physical Education, Henan University of Finance and Economics, Zhengzhou 450046, Henan Province, China
  • Supported by:
    the Project of Henan Provincial Department of Sports, No. 2018026

摘要:

文题释义:
Rho/ROCK信号通路:Rho蛋白是小G结合蛋白Ras超家族成员之一,其通过激活下游蛋白激酶ROCK而产生多种生物学效应,如血管平滑肌的收缩、肌动蛋白细胞骨架形成、细胞黏附与迁移、细胞增殖与凋亡、基因表达等,与临床上多种心血管疾病如心力衰竭、缺血再灌注损伤、肺动脉高压、脑血管痉挛等相关疾病发生有关。对Rho/ROCK信号通路的研究有助于了解这些疾病的发病机制,进而为治疗提供一个新的思路。
运动预适应:是指反复短暂的间歇性大强度运动能够诱导机体产生缺血预适应,进而提高心肌对长时间缺血、缺氧的耐受能力,是减少心肌缺血损伤的有效途径之一。运动预适应作为一种物理刺激,具有简单、安全和易控的特点,对于科学制定训练计划和预防运动性心肌损伤都有重要意义。

背景:目前,关于运动预适应的心肌保护机制尚未完全阐明,据报道Rho/ROCK信号通路在心血管疾病中起到关键作用,运动预适应是否通过Rho/ROCK信号通路对心肌起到保护作用有待研究。

目的:基于Rho/ROCK信号通路探讨运动预适应在力竭运动大鼠心肌损伤中的作用。

方法:将60只5周龄的SPF级SD雄性大鼠随机分为3组:安静对照组、单纯力竭运动组、运动预适应+力竭运动组,各组建模结束后1 h,取血清进行全生化分析检测心肌酶谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平,取心肌组织标本进行苏木精-碱性复红-苦味酸染色观察心肌组织病理变化,分析缺血缺氧程度,TUNEL法观察心肌细胞凋亡情况,ELISA法检测心肌组织肿瘤坏死因子α和白细胞介素10水平,Western blot检测心肌组织RhoA、ROCK1、ROCK2、Bax和Bcl-2蛋白的表达。

结果与结论:①单纯力竭运动组谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平显著高于安静对照组(P < 0.05);而运动预适应+力竭运动组谷草转氨酶、磷酸肌酸激酶、乳酸脱氢酶水平显著低于单纯力竭运动组(P < 0.05);②单纯力竭运动组心肌细胞界限不清楚,呈现出较多斑块状或片状艳红色样区域,与安静对照组相比,有明显的缺血缺氧改变;运动预适应+力竭运动组部分心肌细胞界限不清楚,出现部分斑块状艳红色染色,较单纯力竭运动组缺血缺氧程度明显减轻;③单纯力竭运动组较安静对照组凋亡指数值明显升高,运动预适应+力竭运动组与单纯力竭运动组相比凋亡指数值明显下降(P < 0.05);④单纯力竭运动组的肿瘤坏死因子α和白细胞介素10水平显著高于安静对照组(P < 0.05),运动预适应+力竭运动组肿瘤坏死因子α和白细胞介素10水平显著低于单纯力竭运动组(P < 0.05);⑤单纯力竭运动组的Bcl-2/Bax显著低于安静对照组(P < 0.05),运动预适应+力竭运动组Bcl-2/Bax显著高于单纯力竭运动组(P < 0.05);⑥与安静对照组相比,单纯力竭运动组RhoA、ROCK1、ROCK2蛋白水平明显升高,而运动预适应+力竭运动组RhoA、ROCK1、ROCK2蛋白水平显著低于单纯力竭运动组(P < 0.05);⑦结果表明,运动预适应对心肌损伤具有保护作用,可改善大鼠的心脏功能,其作用机制可能与Rho/ROCK通路有关。

ORCID: 0000-0002-0145-8270(刘晓晨)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


关键词: 运动预适应, 力竭运动, Rho/ROCK, 心肌损伤, 心功能, 细胞凋亡, 蛋白表达

Abstract:

BACKGROUND: At present, the mechanism of exercise preconditioning for myocardial protection has not been fully elucidated. It is reported that Rho/ROCK pathway plays a key role in cardiovascular disease. Whether exercise preconditioning adapts to the myocardium through the Rho/ROCK signaling pathway remains to be studied.

OBJECTIVE: To investigate the role of exercise preconditioning in rats with myocardial injury after exhaustive exercise.

METHODS: Sixty male Sprague-Dawley rats of 5 weeks old were randomly divided into three groups: control group, simple exhaustive exercise group (EE group), and exercise preconditioning group after exhaustive exercise (EP+EE group). At 1 hour after modeling, a serum sample from each rat was taken for biochemical analysis. The levels of aspartate aminotransferase, phosphocreatine kinase, and lactate dehydrogenase were detected. Myocardial tissue samples from each rat were taken for pathological observation using hematoxylin-alkaline reddish-picric acid staining. TUNEL method was used to observe apoptosis in the myocardial tissue. The levels of tumor necrosis factor-α and interleukin-10 in the myocardial tissue were detected by ELISA. The expression of RhoA, ROCK1, ROCK2, Bax, and Bcl-2 protein was analyzed by western blot.

RESULTS AND CONCLUSION: The levels of aspartate aminotransferase, phosphocreatine kinase, and lactate dehydrogenase of the EE group were significantly higher than those of the control group (P < 0.05). The levels of aspartate aminotransferase, phosphocreatine kinase, and lactate dehydrogenase of the EP+EE group were significantly lower than those of the EE group (P < 0.05). The boundary of cardiomyocytes was unclear in the EE group, in which there were more plaque-like or flaky red-like areas as well as more obvious ischemia-anoxia changes as compared with the control group. Some cardiomyocytes presented with unclear boundary in the EP+EE group with some plaque-like brilliant red-like areas, and the degree of ischemia and anoxemia was significantly lower in the EP+EE group than the EE group. The apoptotic index value of the EE group was significantly higher than that of the control group, and the apoptotic index value of the EP+EE group was significantly lower than that of the EE group (P < 0.05). The tumor necrosis factor-α and interleukin-10 levels in the EE group were significantly higher than those in the control group (P < 0.05). The tumor necrosis factor-α and interleukin-10 levels in the EP+EE group were significantly lower than those in the EE group (P < 0.05). The Bcl-2/Bax of the EE group was significantly lower than that of the control group (P < 0.05). The Bcl-2/Bax of the EP+EE group was significantly higher than that of the EE group (P < 0.05). The levels of RhoA, ROCK1 and ROCK2 in the EE group were significantly higher than those in the control group. The levels of RhoA, ROCK1 and ROCK2 in the EP+EE group were significantly lower than those in the EE group (P < 0.05). These findings indicate that exercise preconditioning has a protective effect against myocardial injury and improves cardiac function in rats. The mechanism may be related to the Rho/ROCK pathway.

Key words:

exercise preconditioning, exhaustive exercise, Rho/ROCK, myocardial injury, cardiac function, apoptosis, protein expression

中图分类号: