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miR-206 enforces a slow muscle phenotype
Kristen K Bjorkman1, Martin G Guess1, Brooke C Harrison1
1Department of Molecular, Cellular, and Developmental Biology, BioFrontiers Institute, University of Colorado Boulder, 3415 Colorado Ave., UCB596, Boulder, CO 80303, USA.
Journal of Cell Science
|July 5, 2020
Summary
MicroRNA-206 (miR-206) is crucial for maintaining slow muscle characteristics in skeletal and cardiac tissues. Its absence leads to a faster muscle phenotype and dysfunction, highlighting its role in muscle adaptation and sexual dimorphism.
Area of Science:
- Muscle physiology and molecular biology.
- MicroRNA (miRNA) regulation in cellular adaptation.
- Skeletal and cardiac muscle function.
Background:
- Striated muscle exhibits diverse contractile properties adapted to functional demands.
- Muscle fiber type plasticity allows stimulus-dependent adaptation throughout life.
- MicroRNA-mediated regulation influences molecular adaptation in muscle.
Purpose of the Study:
- To determine if miR-206 actively drives the slow muscle phenotype or is merely a consequence of it.
- To investigate the role of miR-206 in physiological and pathological conditions affecting muscle type.
- To explore the impact of miR-206 on skeletal and cardiac muscle function and sexual dimorphism.
Main Methods:
- Analysis of miR-206 expression in various physiological and pathological conditions.
- Phenotypic characterization of soleus muscle in male miR-206-knockout mice compared to wild-type.
- Assessment of myosin profile, cardiac structure, and function in male miR-206-knockout mice.
Main Results:
- miR-206 expression is upregulated in conditions promoting a slow muscle phenotype, including female sex, endurance exercise, muscular dystrophy, and adrenergic agonism.
- Male miR-206-knockout mice exhibit a faster soleus muscle phenotype compared to wild-type controls.
- Male miR-206-knockout mice display a faster myosin profile in the left ventricle, associated with cardiac dilation and systolic dysfunction.
Conclusions:
- miR-206 is essential for enforcing a slow phenotype in both skeletal and cardiac muscles.
- miR-206 plays a significant role in establishing muscle sexual dimorphisms.
- Targeting miR-206 may offer therapeutic potential for muscle-related disorders.
