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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Exercise training decreases NADPH oxidase activity and restores skeletal muscle mass in heart failure rats

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Cunha, Telma F. ; Bechara, Luiz R. G. ; Bacurau, Aline V. N. ; Jannig, Paulo R. ; Voltarelli, Vanessa A. ; Dourado, Paulo M. ; Vasconcelos, Andrea R. ; Scavone, Cristoforo ; Ferreira, Julio C. B. ; Brum, Patricia C.
Número total de Autores: 10
Tipo de documento: Artigo Científico
Fonte: Journal of Applied Physiology; v. 122, n. 4, p. 817-827, APR 2017.
Citações Web of Science: 8

We have recently demonstrated that NADPH oxidase hyperactivity, NF-kappa B activation, and increased p38 phosphorylation lead to atrophy of glycolytic muscle in heart failure (HF). Aerobic exercise training (AET) is an efficient strategy to counteract skeletal muscle atrophy in this syndrome. Therefore, we tested whether AET would regulate muscle redox balance and protein degradation by decreasing NADPH oxidase hyperactivity and reestablishing NF-kappa B signaling, p38 phosphorylation, and proteasome activity in plantaris muscle of myocardial infarcted-induced HF (MI) rats. Thirty-two male Wistar rats underwent MI or fictitious surgery (SHAM) and were randomly assigned into untrained (UNT) and trained (T; 8 wk of AET on treadmill) groups. AET prevented HF signals and skeletal muscle atrophy in MI-T, which showed an improved exercise tolerance, attenuated cardiac dysfunction and increased plantaris fiber cross-sectional area. To verify the role of inflammation and redox imbalance in triggering protein degradation, circulating TNF-alpha levels, NADPH oxidase profile, NF-kappa B signaling, p38 protein levels, and proteasome activity were assessed. MI-T showed a reduced TNF-alpha levels, NADPH oxidase activity, and Nox2 mRNA expression toward SHAM-UNT levels. The rescue of NADPH oxidase activity induced by AET in MI rats was paralleled by reducing nuclear binding activity of the NF-kappa B, p38 phosphorylation, atrogin-1, mRNA levels, and 26S chymotrypsin-like proteasome activity. Taken together our data provide evidence for AET improving plantaris redox homeostasis in HF associated with a decreased NADPH oxidase, redox-sensitive proteins activation, and proteasome hyperactivity further preventing atrophy. These data reinforce the role of AET as an efficient therapy for muscle wasting in HF. NEW \& NOTEWORTHY This study demonstrates, for the first time, the contribution of aerobic exercise training (AET) in decreasing muscle NADPH oxidase activity associated with reduced reactive oxygen species production and systemic inflammation, which diminish NF-kappa B overactivation, p38 phosphorylation, and ubiquitin proteasome system hyperactivity. These molecular changes counteract plantaris atrophy in trained myocardial infarction-induced heart failure rats. Our data provide new evidence into how AET may regulate protein degradation and thus prevent skeletal muscle atrophy. (AU)

Processo FAPESP: 14/23703-0 - Contribuição das células precursoras miogênicas na miopatia esquelética induzida pela insuficiência cardíaca: perspectiva terapêutica do treinamento físico aeróbico
Beneficiário:Patricia Chakur Brum
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 11/00728-9 - Contribuição do estresse oxidativo para a ativação das vias NF-kB, FOXO e MAPK na atrofia muscular associada à insuficiência cardíaca: efeito do treinamento físico aeróbico e do tratamento com N-acetilcisteína
Beneficiário:Telma Fátima da Cunha Moraes
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 12/05765-2 - Contribuição da enzima aldeído desidrogenase 2 na progressão da insuficiência cardíaca
Beneficiário:Julio Cesar Batista Ferreira
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores