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Myoblast‐derived exosomes promote the repair and regeneration of injured skeletal muscle in mice.

Authors :
Ji, Shusen
Ma, Pei
Cao, Xiaorui
Wang, Juan
Yu, Xiuju
Luo, Xiaomao
Lu, Jiayin
Hou, Wei
Zhang, Zhijuan
Yan, Yi
Dong, Yanjun
Wang, Haidong
Source :
FEBS Open Bio; Dec2022, Vol. 12 Issue 12, p2213-2226, 14p
Publication Year :
2022

Abstract

When skeletal muscle is damaged, satellite cells (SCs) are activated to proliferate rapidly and fuse with the damaged muscle fibers to form new muscle fibers, thereby promoting muscle growth and remodeling and repair of trauma. Exosomes from differentiating human skeletal muscle cells trigger myogenesis of stem cells and provide biochemical cues for skeletal muscle regeneration. Therefore, we hypothesized that, when muscles are injured, myoblast‐derived exosomes may regulate muscle repair and regeneration. Here, we investigated the underlying mechanism by applying C2C12‐derived exosomes to injured mouse skeletal muscles. The expression levels of skeletal muscle regeneration factors paired box 7 and lipid‐promoting factor peroxisome proliferator‐activated receptor γ were upregulated, whereas the expression levels of fibrosis factors collagen‐1 and α‐smooth muscle actin decreased. The expression of proliferating cell nuclear antigen was elevated after applying C2C12‐derived exosomes to SCs. Application of C2C12‐derived exosomes to fibro‐adipogenic progenitors resulted in an increase in peroxisome proliferator‐activated receptor γ expression and adipogenesis capacity, whereas α‐smooth muscle actin expression and fibrosis capacity decreased. Analysis of the transcriptome and proteome of SCs after treatment with exosomes showed the involvement of multiple biological processes, including proliferation and differentiation of SCs, muscle regeneration, skeletal muscle atrophy, and the inflammatory response after muscle injury. Hence, our data suggest that C2C12‐derived exosomes can promote the regeneration of skeletal muscle fibers, accelerate the production of fat from damaged muscles, inhibit the fibrosis of damaged muscles, and accelerate injury repair, which is related to exosome‐mediated regulation of the proliferation of SCs, differentiation of fibro‐adipogenic progenitors, and modulation of SC mRNA expression and protein formation and decomposition. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
22115463
Volume :
12
Issue :
12
Database :
Complementary Index
Journal :
FEBS Open Bio
Publication Type :
Academic Journal
Accession number :
160529538
Full Text :
https://doi.org/10.1002/2211-5463.13504