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Tipo:	Artigo de Periódico
Título:	The MicroRNA miR-696 is regulated by SNARK and reduces mitochondrial activity in mouse skeletal muscle through Pgc1α inhibition
Autor(es):	André L. Queiroz Michael F. Hirshman Luciane C. Alberici Isis do Carmo Kettelhut Laurie J. Goodyear Leonardo R. Silveira Sarah J. Lessard Amanda T. Ouchida Hygor N. Araujo Dawit Albieiro Pinheiro Gonçalves Dimitrius Santiago P. Simões Fróes Guimarães Bruno G. Teodoro Kawai So Enilza M. Espreafico
Resumen:	Objective MicroRNAs (miRNA) are known to regulate the expression of genes involved in several physiological processes including metabolism, mitochondrial biogenesis, proliferation, differentiation, and cell death. Methods Using “in silico” analyses, we identified 219 unique miRNAs that potentially bind to the 3′UTR region of a critical mitochondrial regulator, the peroxisome proliferator-activated receptor gamma coactivator (PGC) 1 alpha (Pgc1α). Of the 219 candidate miRNAs, miR-696 had one of the highest interactions at the 3′UTR of Pgc1α, suggesting that miR-696 may be involved in the regulation of Pgc1α. Results Consistent with this hypothesis, we found that miR-696 was highly expressed in the skeletal muscle of STZ-induced diabetic mice and chronic high-fat-fed mice. C2C12 muscle cells exposed to palmitic acid also exhibited a higher expression of miR-696. This increased expression corresponded with a reduced expression of oxidative metabolism genes and reduced mitochondrial respiration. Importantly, reducing miR-696 reversed decreases in mitochondrial activity in response to palmitic acid. Using C2C12 cells treated with the AMP-activated protein kinase (AMPK) activator AICAR and skeletal muscle from AMPKα2 dominant-negative (DN) mice, we found that the signaling mechanism regulating miR-696 did not involve AMPK. In contrast, overexpression of SNF1-AMPK-related kinase (SNARK) in C2C12 cells increased miR-696 transcription while knockdown of SNARK significantly decreased miR-696. Moreover, muscle-specific transgenic mice overexpressing SNARK exhibited a lower expression of Pgc1α, elevated levels of miR-696, and reduced amounts of spontaneous activity. Conclusions Our findings demonstrate that metabolic stress increases miR-696 expression in skeletal muscle cells, which in turn inhibits Pgc1α, reducing mitochondrial function. SNARK plays a role in this process as a metabolic stress signaling molecule inducing the expression of miR-696.
Asunto:	Fisiologia Morfologia vegetal Músculos Mitocôndrias
Idioma:	eng
País:	Brasil
Editor:	Universidade Federal de Minas Gerais
Sigla da Institución:	UFMG
Departamento:	EEF - DEPARTAMENTO DE EDUCAÇÃO FÍSICA EEFFTO - ESCOLA DE EDUCAÇÃO FISICA, FISIOTERAPIA E TERAPIA OCUPACIONAL
Tipo de acceso:	Acesso Aberto
Identificador DOI:	https://doi.org/10.1016/j.molmet.2021.101226
URI:	http://hdl.handle.net/1843/64806
Fecha del documento:	2021
metadata.dc.url.externa:	https://www.sciencedirect.com/science/article/pii/S2212877821000715?via%3Dihub
metadata.dc.relation.ispartof:	Molecular Metabolism
Aparece en las colecciones:	Artigo de Periódico

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