The role and mechanism of miR-122 in high-intensity interval training′s improving non-alcoholic fatty liver disease
10.3760/cma.j.cn421666-20240828-00699
- VernacularTitle:miR-122在高强度间歇训练改善糖尿病大鼠非酒精性脂肪性肝病中的作用及机制探讨
- Author:
Minfei WANG
1
;
Qianqian WANG
;
Chunhong BAI
;
Qiong WAN
Author Information
1. 郑州工业应用技术学院体育学院，郑州 451100
- Publication Type:Journal Article
- Keywords:
Interval training;
Training intensity;
miR-122;
Diabetes;
Fatty liver disease
- From:
Chinese Journal of Physical Medicine and Rehabilitation
2025;47(1):7-12
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To observe the effect of high-intensity interval training (HIIT) on diabetic rats with non-alcoholic fatty liver disease (NAFLD), and to explore the role of miR-122 in it.Methods:Forty Wistar rats were randomly divided into a healthy control group, a sedentary group, a high-intensity interval training (HIIT) group and a moderate-intensity continuous training (MICT) group using a random number table. All except the healthy control group had type 2 diabetes with NAFLD induced using a high-fat and high-fructose diet. The healthy control and sedentary groups were kept quiet in their cages, while the HIIT and MICT groups performed treadmill exercise of the corresponding intensity for 8 consecutive weeks. At 48h after the last training, plasma was collected to measure biochemical markers, and the livers were resected for histological observation using hematoxylin and eosin staining. miR-122 expression was measured using real-time fluorescent quantitative polymerase chain reactions, while the protein expressions of fatty acid synthase (FAS), acetyl-CoA carboxylase (ACC), sterol regulatory element binding protein-1c (SREBP1c) and peroxisome proliferator-activated receptor γ (PPARγ) were detected using western blotting.Results:Compared with the healthy control group, the average fasting blood glucose (FBG), triglyceride (TG), total cholesterol (TC), alanine aminotransferase (ALT), aspartate aminotransferase (AST), insulin and insulin resistance index (HOMA-IR) had increased significantly in the sedentary group. Compared with the sedentary group, the average FBG, TG, TC, insulin and HOMA-IR had decreased significantly in both the HIIT and MICT groups, and the average ALT and AST in the HIIT group had also decreased significantly. The average TG, TC, ALT and AST levels in the HIIT group were then significantly lower than in the MICT group. Compared with the sedentary group, the average liver steatosis score had decreased significantly in both the HIIT and MICT groups, with that of the HIIT group significantly lower than in the MICT group, on average. Compared with the healthy control group, the expression of miR-122 had decreased significantly, but that of SREBP1c, PPARγ, FAS and ACC had increased significantly in the sedentary group. And compared with the sedentary group, the expression of miR-122 had increased significantly in both the HIIT and MICT groups, on average, but that of SREBP1c, PPARγ, FAS and ACC had decreased significantly. Average miR-122 levels in the HIIT group were then significantly higher, and those of SREBP1c, PPARγ, FAS and ACC were significantly lower than in the MICT group.Conclusions:Either MICT or HIIT training can relieve NAFLD in rats modeling diabetes, but HIIT has a better therapeutic effect. Its therapeutic mechanism may be related to the upregulation of miR-122 in the liver.
