Resistance exercise induces release of irisin from skeletal muscle and im-proves function of bone marrow endothelial progenitor cells in type 2 dia-betic rats
10.3969/j.issn.1000-4718.2025.01.003
- VernacularTitle:抗阻运动诱导骨骼肌释放鸢尾素并改善2型糖尿病大鼠骨髓内皮祖细胞功能
- Author:
Meng KOU
1
;
Hao HU
;
Yong ZHANG
;
Yadong CHEN
Author Information
1. 安徽工程大学体育学院,安徽 芜湖 241000
- Publication Type:Journal Article
- Keywords:
resistance exercise;
diabetes mellitus;
skeletal muscle;
irisin;
endothelial progenitor cells
- From:
Chinese Journal of Pathophysiology
2025;41(1):19-27
- CountryChina
- Language:Chinese
-
Abstract:
AIM:To investigate the effect of resistance exercise on the function of endothelial progenitor cells(EPCs)in type 2 diabetic rats and explore the mechanism of myokine irisin in this process.METHODS:Forty 6-week-old healthy male SD rats were selected,ten of which were used as control group,and the rest were fed with high-fat and high-sugar diet combined with streptozotocin injection for diabetic modeling.The rats were randomly divided into model group and model exercise group,with 15 rats in each group.The animals in the control and model groups were kept quiet-ly,and those of model exercise group underwent tail-loaded ladder climbing training for 12 weeks(3 times/week).72 hours after the last training,plasma,gastrocnemius and femur were separated.The irisin content of each tissue and mRNA as well as protein expression of fibronectin type Ⅲ domain-containing protein 5(FNDC5)in the gastrocnemius and femur were measured.Bone marrow endothelial progenitor cells were isolated and cultivated,and then treated with exoge-nous irisin for 48 hours.The cell viability and adhesion function of endothelial progenitor cells were detected by CCK-8 and adhesion assay,respectively.The endothelial repair ability was detected by carotid artery injury model in nude mice.The protein expression of phosphatidylinositol 3-kinase(PI3-K)/Akt/endothelial nitric oxide synthase(eNOS)signaling pathway was detected by Western blot.RESULTS:(1)In vivo experiment:compared with the control group,the model group showed a decrease in plasma,gastrocnemius muscle,and femoral irisin content,as well as a decrease in gastrocne-mius muscle FNDC5 mRNA and protein expression levels(P＜0.05).Compared with the model group,the levels of irisin in plasma,gastrocnemius muscle and femur,as well as the expression of FNDC5 mRNA and protein in gastrocnemius mus-cle,increased in the model exercise group(P＜0.05).There was no significant change in the expression of FNDC5 mRNA and protein in the femurs of each group(P＜0.05).(2)Cell experiment:① endothelial progenitor cells without irisin treatment:compared with the control group,the cell viability,adhesion function,and endothelial injury repair ability of endothelial progenitor cells reduced(P＜0.05),and the expression of PI3-K,Akt,eNOS signaling pathway down-regulated in the model group(P＜0.05).Compared with the model group,the model exercise group showed improvement in endothe-lial progenitor cell function(P＜0.05)and up-regulation of protein expression in the PI3-K/Akt/eNOS signaling pathway(P＜0.05).② Endothelial progenitor cells treated with irisin:supplementation with irisin improved the function of endotheli-al progenitor cells and increased the expression of various proteins in the PI3-K/Akt/eNOS signaling pathway in the model group and model exercise group compared with those without irisin treatment(P＜0.05).CONCLUSION:Regular resis-tance exercise can improve the function of endothelial progenitor cells in type 2 diabetic rats,and its mechanism may be re-lated to the regulation of PI3-K/Akt/eNOS signaling pathway by myokine irisin released from skeletal muscle.
