Related Experiment Video
Updated: Aug 6, 2026
10:03
Transplantation of Induced Pluripotent Stem Cell-derived Mesoangioblast-like Myogenic Progenitors in Mouse Models of Muscle Regeneration
Published on: January 20, 2014
The Injection of miR-1/133 Antagonist Notably Accelerated the Healing Process of Exercise-Induced Skeletal Muscle
1Department of Sports and Health, Nanjing Sports Institute, Nanjing, China. 2008090032@nsi.edu.cn or lxjmqb2006@163.com.
Physiological Research
|July 22, 2026
Summary
MicroRNAs miR-1-3p and miR-133a-3p target key proteins for skeletal muscle regeneration after exercise-induced muscle damage (EIMD). Targeting these microRNAs promotes muscle repair and fiber structure recovery.
Area of Science:
- Muscle physiology and molecular biology
- Skeletal muscle injury and repair mechanisms
- MicroRNA-mediated gene regulation
Background:
- Exercise-induced muscle damage (EIMD) impairs daily function, necessitating effective repair strategies.
- Understanding the molecular mechanisms governing skeletal muscle regeneration is crucial for developing targeted therapies.
- MicroRNAs play significant roles in cellular processes, including muscle development and repair.
Purpose of the Study:
- To investigate the role and mechanism of microRNAs in treating exercise-induced muscle damage.
- To identify the critical time point for skeletal muscle repair following acute injury.
- To elucidate the time-specific changes in key regulatory factors like MRTF-A, Pax7, and SRF during muscle regeneration.
Main Methods:
- Establishment of an acute skeletal muscle injury model in rats.
- Analysis of time-specific changes in muscle regeneration factors and microRNA expression.
- Injection of microRNA antagonists to verify targeting relationships and assess functional effects.
- Assessment of muscle fiber structure, proliferation, differentiation, and atrophy.
Main Results:
- A single bout of eccentric exercise induced significant gastrocnemius muscle damage, with peak injury at 72 hours post-exercise, identified as a crucial repair window.
- Both miR-1-3p and miR-133a-3p were found to suppress the protein translation of MRTF-A, Pax7, and SRF.
- MicroRNA antagonists targeting the MRTF-A/Pax7 and MRTF-A/SRF axes differentially modulated muscle proliferation and differentiation, with combined injection promoting comprehensive repair.
Conclusions:
- miR-1-3p and miR-133a-3p are key regulators in skeletal muscle regeneration following EIMD.
- Targeting these microRNAs, particularly through combined antagonism, offers a promising therapeutic strategy for enhancing muscle repair and restoring skeletal muscle fiber structure.
