Dong Sun - Department of Cardiology, Tangdu Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۸, P.R. China
Haichang Wang - Department of Cardiology, Tangdu Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۸, P.R. China
Yanhui Su - Department of Comprehensive Surgery of The Second Medical Center, General Hospital of Chinese People’s Liberation Army, Beijing ۱۰۰۸۵۳, P.R. China
Jie Lin - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Mingming Zhang - Department of Cardiology, Tangdu Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۸, P.R. China
Wanrong Man - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Xinglong Song - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Liang Zhang - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Baolin Guo - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Kaikai Hao - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China
Dongdong Sun - Department of Cardiology, Xijing Hospital, Air Force Medical University of PLA, Xi’an ۷۱۰۰۳۲, P.R. China

Objective(s): Physical exercise has emerged as an effective therapy to mitigate cardiac remodelling in diabetic cardiomyopathy (DCM). The results of our previous studies revealed mammalian sterile 20-like kinase 1 (Mst1) is a key regulator of the progression of DCM. However, the precise molecular mechanism of physical exercise-induced cardiac protection and its association with Mst1 inhibition remain unclear. Materials and Methods: Wildtype and Mst1 transgenic mice were challenged with streptozotocin (STZ) to induce experimental diabetes and were divided into sedentary and exercise groups. The DCM phenotype was evaluated by echocardiography, Masson’s trichrome staining, TUNEL and immunoblotting analyses. The exercise-regulated miRNAs targeting Mst1 were predicted by bioinformatic analysis and later confirmed by RT-qPCR, immunoblotting, and dual-luciferase reporter assays. In addition, cultured neonatal mouse cardiomyocytes were subjected to simulate diabetes to elucidate the underlying mechanisms. Results: Compared to the sedentary diabetic control, physical exercise inhibited Mst1 and alleviated cardiac remodelling in mice with DCM, as evidenced by decreases in the left ventricular end-systolic internal dimension (LVESD) and left ventricular end-diastolic internal dimension (LVEDD), increases in the left ventricular ejection fraction (LVEF) and left ventricular fractional shortening (LVFS), attenuation of collagen deposition, and the suppression of apoptosis. Bioinformatic analysis and apoptosis assessments revealed exercise exerted protective effects against DCM through miR-486a-5p release. Moreover, luciferase reporter assays confirmed miR-486a-5p directly suppressed the expression of Mst1, thereby inhibiting the apoptosis of cardiomyocytes subjected to high glucose treatment. Conclusion: Physical exercise inhibits cardiac remodelling in DCM, and the mechanism is associated with miR-486a-5p release-induced Mst1 inhibition.

Apoptosis Diabetic cardiomyopathy Exercise Mst1 (STK4) miR, 486a, 5p