Elevated H3K27ac in aged skeletal muscle leads to increase in extracellular matrix and fibrogenic conversion of muscle satellite cells
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AbstractEpigenetic alterations occur in various cells and tissues during aging, but it is not known if such alterations are also associated with aging in skeletal muscle. Here, we examined the changes of a panel of histone modifications and found H3K27ac (an active enhancer mark) is markedly increased in aged human skeletal muscle tissues. Further analyses uncovered that the H3K27ac increase and enhancer activation are associated with the up-regulation of extracellular matrix (ECM) genes; this may result in alteration of the niche environment for skeletal muscle stem cells, also called satellite cells (SCs), which causes decreased myogenic potential and fibrogenic conversion of SCs. In mice, treatment of aging muscles with JQ1, an inhibitor of enhancer activation, inhibited the ECM up-regulation and fibrogenic conversion of SCs and restored their myogenic differentiation potential. Altogether, our findings not only uncovered a novel aspect of skeletal muscle aging that is associated with enhancer remodeling but also implicated JQ1 as a potential treatment approach for restoring SC function in aging muscle.
Acceptance Date20/07/2019
All Author(s) ListJiajian Zhou, Karl K So, Yuying Li, Yang Li, Jie Yuan, Yingzhe Ding, Fengyuan Chen, Yile Huang, Jin Liu, Wayne Lee, Gang Li, Zhenyu Liu, Hao Sun, Huating Wang
Journal nameAging Cell
Volume Number18
Issue Number5
Place of PublicationUSA
Article numbere12996
LanguagesEnglish-United States
Keywordsaging, enhancer, extracellular matrix, H3K27ac, JQ1, satellite cell, skeletal muscle

Last updated on 2021-17-09 at 23:57