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Nat Commun ; 12(1): 1418, 2021 03 03.
Artigo em Inglês | MEDLINE | ID: mdl-33658508

RESUMO

Sarcopenia is a degenerative condition that consists in age-induced atrophy and functional decline of skeletal muscle cells (myofibers). A common hypothesis is that inducing myofiber hypertrophy should also reinstate myofiber contractile function but such model has not been extensively tested. Here, we find that the levels of the ubiquitin ligase UBR4 increase in skeletal muscle with aging, and that UBR4 increases the proteolytic activity of the proteasome. Importantly, muscle-specific UBR4 loss rescues age-associated myofiber atrophy in mice. However, UBR4 loss reduces the muscle specific force and accelerates the decline in muscle protein quality that occurs with aging in mice. Similarly, hypertrophic signaling induced via muscle-specific loss of UBR4/poe and of ESCRT members (HGS/Hrs, STAM, USP8) that degrade ubiquitinated membrane proteins compromises muscle function and shortens lifespan in Drosophila by reducing protein quality control. Altogether, these findings indicate that these ubiquitin ligases antithetically regulate myofiber size and muscle protein quality control.


Assuntos
Envelhecimento/fisiologia , Proteínas de Ligação a Calmodulina/metabolismo , Proteínas de Drosophila/metabolismo , Fibras Musculares Esqueléticas/fisiologia , Proteínas Musculares/metabolismo , Ubiquitina-Proteína Ligases/metabolismo , Animais , Animais Geneticamente Modificados , Autofagia/fisiologia , Proteínas de Ligação a Calmodulina/genética , Proteínas de Drosophila/genética , Feminino , Lisossomos/metabolismo , Masculino , Camundongos Endogâmicos C57BL , Camundongos Knockout , Fibras Musculares Esqueléticas/metabolismo , Músculo Esquelético/patologia , Músculo Esquelético/fisiologia , Proteólise , Ubiquitina/metabolismo , Ubiquitina-Proteína Ligases/genética
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