静力性训练改善2型糖尿病骨骼肌胰岛素抵抗的机制  

Mechanism by which static exercise improves insulin resistance in skeletal muscle of type 2 diabetes

作　　者：魏娟 李婷 郇梦婷 谢颖 谢舟煜 韦庆波 吴云川[1] Wei Juan;Li Ting;Huan Mengting;Xie Ying;Xie Zhouyu;Wei Qingbo;Wu Yunchuan(College of Acupuncture and Tuina and Rehabilitation,Nanjing University of Chinese Medicine,Nanjing 210023,Jiangsu Province,China;Yangzhou Jiangdu Hospital of Traditional Chinese Medicine,Yangzhou 225000,Jiangsu Province,China)

机构地区：[1]南京中医药大学针灸推拿学院·养生康复学院,江苏省南京市210023 [2]扬州市江都中医院,江苏省扬州市225000

出　　处：《中国组织工程研究》2024年第8期1271-1276,共6页Chinese Journal of Tissue Engineering Research

基　　金：中医传统功法对社区2型糖尿病患者血糖稳态干预和下丘脑功能的研究(JDZX2015127),项目负责人:吴云川。

摘　　要：背景:骨骼肌胰岛素抵抗是2型糖尿病的关键病理环节,静力性训练可以有效改善骨骼肌胰岛素抵抗,但其机制尚未明确。目的:基于PI3K/AKT/GLUT4信号通路,探讨静力性训练对2型糖尿病小鼠骨骼肌胰岛素抵抗的作用机制。方法:将40只C57BL/6小鼠适应性喂养1周后,随机选取7只作为空白组,普通饲料喂养;其余小鼠通过高脂饲料联合小剂量链脲佐菌素腹腔注射建立2型糖尿病模型。将24只造模成功的小鼠随机分为模型组(n=8)、二甲双胍组(n=8)及静力性训练组(n=8),继续以高脂饲料喂养。二甲双胍组以二甲双胍200 mg/kg的剂量溶于生理盐水(2 mL/kg)灌胃,1次/d;静力性训练组每日以生理盐水灌胃后予静力性训练,每日30 min,每周运动6 d;模型组每日予同等剂量生理盐水灌胃,无运动干预。干预6周结束后检测各组小鼠空腹血糖,行腹腔葡萄糖耐量测试并计算血糖曲线下面积;ELISA检测糖化血红蛋白、血清胰岛素、胰岛素抵抗指数;生化法检测总胆固醇、三酰甘油、高密度脂蛋白、低密度脂蛋白;RT-qPCR法检测小鼠腓肠肌PI3K、AKT和GLUT4的mRNA表达量;苏木精-伊红染色观察腓肠肌形态学变化,并计算肌纤维横截面积。结果与结论:①与空白组相比,模型组小鼠的空腹血糖、糖化血红蛋白、血糖曲线下面积、胰岛素抵抗指数、总胆固醇、三酰甘油、低密度脂蛋白显著升高(P<0.01,P<0.05);静力性训练组和二甲双胍组小鼠上述指标显著低于模型组(P<0.01,P<0.05);②与空白组相比,模型组小鼠血清胰岛素和高密度脂蛋白显著下降(P<0.01),腓肠肌组织中PI3K、AKT和GLUT4 mRNA表达量显著下降(P<0.01);静力性训练组和二甲双胍组小鼠上述指标显著升高(P<0.01);③与空白组相比,模型组小鼠肌纤维排列紊乱,肌细胞萎缩,肌纤维间隙变大,肌纤维横截面积显著减少(P<0.01);与模型组相比,静力性训练组和二甲双胍组小鼠的腓肠肌�BACKGROUND:Skeletal muscle insulin resistance is the key pathological link of type 2 diabetes.Static exercise can effectively improve skeletal muscle insulin resistance,but the mechanism remains unclear.OBJECTIVE:To explore the mechanism of static exercise on insulin resistance in the skeletal muscle of type 2 diabetic mice based on the phosphatidyl inositol 3-kinase(PI3K)/protein kinase B(AKT)/glucose transporter(GLUT4)signaling pathway.METHODS:After 1 week of adaptive feeding,7 out of 40 C57BL/6 mice were randomly selected as blank group and fed common diet,while the other mice were fed high-fat diet and taken to prepare type 2 diabetes models through the low-dose streptozotocin intraperitoneal injection.Twenty-four mice were successfully modeled and they were randomly divided into model group(n=8),metformin group(n=8)and static exercise group(n=8),which continued to be fed high-fat diet.The metformin group was given 200 mg/kg metformin dissolved in normal saline(2 ml/kg)by gavage,once a day,for 6 weeks.The static exercise group was given normal saline daily by gavage and carried out static exercise,30 minutes a day,6 days per week.The model group was given the same dose of normal saline daily by gavage without exercise intervention.After the intervention,the fasting blood glucose of each group was detected,the intraperitoneal glucose tolerance test was performed,and the area under the glycemic curve was calculated.Glycosylated hemoglobin,serum insulin,insulin resistance index were detected by ELISA.Total cholesterol,triglyceride,high-density lipoprotein,low-density lipoprotein were detected using biochemical methods.The mRNA expression levels of PI3K,AKT and GLUT4 in the gastrocnemius of mice were detected by real-time quantitative PCR.Morphological changes of the gastrocnemius were observed by hematoxylin-eosin staining,and the cross-sectional area of muscle fibers was calculated.RESULTS AND CONCLUSION:Compared with the blank group,fasting blood glucose,glycosylated hemoglobin,area under the glycemic curve,in

关 键 词：2型糖尿病 静力性训练 骨骼肌 胰岛素抵抗 PI3K/AKT/GLUT4信号通路 

分 类 号：R496[医药卫生—康复医学] R318[医药卫生—临床医学] R446