pH-Gated Succinate Secretion Regulates Muscle Remodeling in Response to Exercise

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Reddy, Anita ; Bozi, Luiz H. M. ; Yaghi, Omar K. ; Mills, Evanna L. ; Xiao, Haopeng ; Nicholson, Hilary E. ; Paschini, Margherita ; Paulo, Joao A. ; Garrity, Ryan ; Laznik-Bogoslavski, Dina ; Ferreira, Julio C. B. ; Carl, Christian S. ; Sjoberg, Kim A. ; Wojtaszewski, Jorgen F. P. ; Jeppesen, Jacob F. ; Kiens, Bente ; Gygi, Steven P. ; Richter, Erik A. ; Mathis, Diane ; Chouchani, Edward T.

• Tipo de documento: Artigo Científico
• Fonte: Cell; v. 183, n. 1, p. 31-pg., 2020-10-01.

Resumo

In response to skeletal muscle contraction during exercise, paracrine factors coordinate tissue remodeling, which underlies this healthy adaptation. Here we describe a pH-sensing metabolite signal that initiates muscle remodeling upon exercise. In mice and humans, exercising skeletal muscle releases the mitochondria! metabolite succinate into the local interstitium and circulation. Selective secretion of succinate is facilitated by its transient protonation, which occurs upon muscle cell acidification. In the protonated monocarboxylic form, succinate is rendered a transport substrate for monocarboxylate transporter 1, which facilitates pH gated release. Upon secretion, succinate signals via its cognate receptor SUCNR1 in non-myofibrillar cells in muscle tissue to control muscle-remodeling transcriptional programs. This succinate-SUCNR1 signaling is required for paracrine regulation of muscle innervation, muscle matrix remodeling, and muscle strength in response to exercise training. In sum, we define a bioenergetic sensor in muscle that utilizes intracellular pH and succinate to coordinate tissue adaptation to exercise. (AU)

• Processo FAPESP: 19/07221-9 - Papel da resposta as proteínas mal enoveladas mitocondrial (UPRmt) na cardiomiopatia induzida pela doxorrubicina: aplicação de metabolômica comparativa para identificar assinaturas metabólicas
• Beneficiário: Luiz Henrique Marchesi Bozi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado