4.5 Review

Skeletal Muscle Stem Cells in Aging: Asymmetric/Symmetric Division Switching

Journal

SYMMETRY-BASEL
Volume 14, Issue 12, Pages -

Publisher

MDPI
DOI: 10.3390/sym14122676

Keywords

satellite cells; muscle aging; asymmetric; symmetric divisions

Funding

  1. Ministry of Research, Innovation and Digitalization in Romania [31PFE/30.12.2021, 1N/2019/PN19.29.01.03, PN 19.29.02.01]

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In aged muscle, the division of satellite cells is impaired. It is important to understand the balance between muscle regeneration, muscle homeostasis, aging, and disease, and stimulating muscle regeneration in aging could be a therapeutic target. However, there is still a need to comprehend the complex mechanisms in satellite cells and their niche.
In aged muscle, satellite cells' symmetric and asymmetric divisions are impaired, and intrinsic and extrinsic complex mechanisms govern these processes. This review presents many updated aspects regarding muscle stem cells' fate in normal and aging conditions. The balance between self-renewal and commitment divisions contributes to muscle regeneration, muscle homeostasis, aging, and disease. Stimulating muscle regeneration in aging could be a therapeutic target, but there is still a need to understand the many mechanisms that influence each other in satellite cells and their niche. We highlight here the general outlines regarding satellite cell divisions, the primary markers present in muscle stem cells, the aging aspects concerning signaling pathways involved in symmetric/asymmetric divisions, the regenerative capacity of satellite cells and their niche alteration in senescent muscle, genetics and epigenetics mechanisms implied in satellite cells aging and exercise effect on muscle regeneration in the elderly.

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