摘要
背景:研究表明,心肌细胞凋亡与心脏功能减退及心脏衰老过程密切相关,适宜的运动可以改变心力衰竭患者的心泵功能以及减轻衰老引起的心肌细胞凋亡、肥大和纤维化损伤。目的:探究长期有氧运动对衰老大鼠心肌细胞凋亡及硫氧还蛋白系统的影响。方法:选取雄性SD大鼠36只,按照鼠龄分为青年组(3月龄)、中年组(9月龄)、老年组(18月龄),每组12只;每组又分为安静、运动2个亚组,每组6只,安静组常规饲养,运动组进行有氧运动训练(45 min/d,5 d/周,训练10周)。末次训练后24 h,采用ELISA法检测大鼠血清肌钙蛋白Ⅰ和血清肌酸激酶同工酶MB水平,TUNEL染色检测心肌细胞凋亡,Western Blot检测大鼠心肌组织中Bax、Bcl-2、Caspase 3、硫氧还蛋白1、硫氧还蛋白2、硫氧还蛋白还原酶1、硫氧还蛋白还原酶2、硫氧还蛋白相互作用蛋白、凋亡信号调节激酶1、P38丝裂原活化激酶的蛋白表达。结果与结论:(1)老年安静组大鼠血清肌钙蛋白Ⅰ和肌酸激酶同工酶MB水平高于青年安静组、中年安静组、老年运动组(P <0.01),老年运动组大鼠血清肌钙蛋白Ⅰ和肌酸激酶同工酶MB水平高于青年运动组、中年运动组(P <0.01);(2)无论是安静状态还是运动训练后,随着鼠龄的增加,大鼠凋亡心肌细胞数量及Bax、Caspase 3蛋白表达逐渐升高,Bcl-2蛋白表达逐渐降低;与同龄段安静组相比,运动组大鼠凋亡心肌细胞数量及Bax、Caspase 3蛋白表达均不同程度降低,Bcl-2蛋白表达均不同程度升高;(3)老年安静组大鼠心肌硫氧还蛋白1、硫氧还蛋白2、硫氧还蛋白还原酶1、硫氧还蛋白还原酶2蛋白表达低于青年安静组、中年安静组、老年运动组(P <0.05,P <0.01);老年运动组大鼠心肌硫氧还蛋白1、硫氧还蛋白2、硫氧还蛋白还原酶2蛋白表达低于青年运动组(P <0.05,P <0.01),硫氧还蛋白还原酶1、硫氧还蛋白还原酶2蛋白表达低于中年运动组(
BACKGROUND:Studies have shown that cardiomyocyte apoptosis is closely related to cardiac decompensation and the cardiac aging process.Appropriate exercise can alter heart pump function in patients with heart failure as well as attenuate aging-induced cardiomyocyte apoptosis,hypertrophy,and fibrotic damage.OBJECTIVE:To investigate the effects of long-term aerobic exercise on cardiomyocyte apoptosis and the thioredoxin system in aging rats.METHODS:Thirty-six male Sprague-Dawley rats were selected and divided into three age groups:3-month-old young group,9-month-old middle-aged group,and 18-month-old elderly group,with 12 rats in each group.Within each age group,rats were randomly assigned to sedentary and exercise subgroups(n=6 per group).The sedentary groups did not undergo any exercise intervention.The exercise groups were acclimated to a treadmill environment and subsequently subjected to treadmill exercise for 45 minutes per day,at a speed of 15 m/min,5 days per week for 10 weeks in total.At 24 hours after the final intervention,ELISA was employed to measure serum levels of cardiac troponin I and creatine kinase-MB in rats.TUNEL assay was utilized to detect cardiomyocyte apoptosis,while western blot assay was employed to assess the protein expression of Bax,Bcl-2,Caspase 3,thioredoxin-1,thioredoxin-2,thioredoxin reductase-1,thioredoxin reductase-2,thioredoxin-interacting protein,apoptosis signal-regulating kinase 1,and P38 mitogen-activated protein kinase in rat myocardial tissue.RESULTS AND CONCLUSION:Serum levels of cardiac troponin I and creatine kinase-MB in the elderly sedentary group were significantly higher than those in the young and middle-aged sedentary groups and elderly exercise group(P<0.01).Serum levels of cardiac troponin I and creatine kinase-MB in the elderly sedentary group were significantly higher than those in the young and middle-aged exercise groups and elderly exercise group(P<0.01).Positive apoptotic cells in rat myocardial tissue,along with increased protein expression of Bax and Casp
作者
徐政
赵晓琴
陈肖丹
王嘉璞
鲍粉苗
于亮
李俊平
魏延
Xu Zheng;Zhao Xiaoqin;Chen Xiaodan;Wang Jiapu;Bao Fenmiao;Yu Liang;Li Junping;Wei Yan(School of Physical Education,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China;School of Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China;School of Sports Human Science,Beijing Sport University,Beijing 100084,China)
出处
《中国组织工程研究》
CAS
北大核心
2024年第34期5508-5515,共8页
Chinese Journal of Tissue Engineering Research
基金
国家自然科学基金项目(32071168),项目参与人:于亮
中央高校基本科研业务费专项资金资助项目(2022YB019),项目负责人:于亮
山西省自然科学基金面上项目(201901D111079),项目负责人:赵晓琴。
