Ghrelin knockout mice display defective skeletal muscle regeneration and impaired satellite cell self-renewal

Ghrelin knockout mice display defective skeletal muscle regeneration and impaired satellite cell... Purpose Muscle regeneration depends on satellite cells (SCs), quiescent precursors that, in consequence of injury or pathological states such as muscular dystrophies, activate, proliferate, and differentiate to repair the damaged tissue. A subset of SCs undergoes self-renewal, thus preserving the SC pool and its regenerative potential. The peptides produced by the ghrelin gene, i.e., acylated ghrelin (AG), unacylated ghrelin (UnAG), and obestatin (Ob), affect skeletal muscle biology in several ways, not always with overlapping effects. In particular, UnAG and Ob promote SC self-renewal and myoblast differentiation, thus fostering muscle regeneration. Methods To delineate the endogenous contribution of preproghrelin in muscle regeneration, we evaluated the repair process −/− in Ghrl mice upon CTX-induced injury. −/− Results Although muscles from Ghrl mice do not visibly differ from WT muscles in term of weight, structure, and SCs −/− content, muscle regeneration after CTX-induced injury is impaired in Ghrl mice, indicating that ghrelin-derived peptides actively participate in muscle repair. Remarkably, the lack of ghrelin gene impacts SC self-renewal during regeneration. Conclusions Although we cannot discern the specific Ghrl-derived peptide responsible for such activities, these data indicate that Ghrl contributes to a proper muscle regeneration. ● ● ● Keywords Ghrelin knockout Skeletal muscle regeneration http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Endocrine Springer Journals

Ghrelin knockout mice display defective skeletal muscle regeneration and impaired satellite cell self-renewal

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Abstract

Purpose Muscle regeneration depends on satellite cells (SCs), quiescent precursors that, in consequence of injury or pathological states such as muscular dystrophies, activate, proliferate, and differentiate to repair the damaged tissue. A subset of SCs undergoes self-renewal, thus preserving the SC pool and its regenerative potential. The peptides produced by the ghrelin gene, i.e., acylated ghrelin (AG), unacylated ghrelin (UnAG), and obestatin (Ob), affect skeletal muscle biology in several ways, not always with overlapping effects. In particular, UnAG and Ob promote SC self-renewal and myoblast differentiation, thus fostering muscle regeneration. Methods To delineate the endogenous contribution of preproghrelin in muscle regeneration, we evaluated the repair process −/− in Ghrl mice upon CTX-induced injury. −/− Results Although muscles from Ghrl mice do not visibly differ from WT muscles in term of weight, structure, and SCs −/− content, muscle regeneration after CTX-induced injury is impaired in Ghrl mice, indicating that ghrelin-derived peptides actively participate in muscle repair. Remarkably, the lack of ghrelin gene impacts SC self-renewal during regeneration. Conclusions Although we cannot discern the specific Ghrl-derived peptide responsible for such activities, these data indicate that Ghrl contributes to a proper muscle regeneration. ● ● ● Keywords Ghrelin knockout Skeletal muscle regeneration

Journal

Endocrine – Springer Journals

Published: May 30, 2018

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