NOX2 inhibition impairs early muscle gene expression induced by a single exercise bout

Carlos Henríquez-Olguín, Alexis Díaz-Vegas, Yildy Utreras-Mendoza, Cristian Campos, Manuel Arias-Calderón, Paola Llanos, Ariel Contreras-Ferrat, Alejandra Espinosa, Francisco Altamirano, Enrique Jaimovich, Denisse M. Valladares

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Reactive oxygen species (ROS) participate as signaling molecules in response to exercise in skeletal muscle. However, the source of ROS and the molecular mechanisms involved in these phenomena are still not completely understood. The aim of this work was to study the role of skeletal muscle NADPH oxidase isoform 2 (NOX2) in the molecular response to physical exercise in skeletal muscle. BALB/c mice, pre-treated with a NOX2 inhibitor, apocynin, (3 mg/kg) or vehicle for 3 days, were swim-exercised for 60 min. Phospho-p47phox levels were significantly upregulated by exercise in flexor digitorum brevis (FDB). Moreover, exercise significantly increased NOX2 complex assembly (p47phox-gp91phox interaction) demonstrated by both proximity ligation assay and co-immunoprecipitation. Exercise-induced NOX2 activation was completely inhibited by apocynin treatment. As expected, exercise increased the mRNA levels of manganese superoxide dismutase (MnSOD), glutathione peroxidase (GPx), citrate synthase (CS), mitochondrial transcription factor A (tfam) and interleukin-6 (IL-I6) in FDB muscles. Moreover, the apocynin treatment was associated to a reduced activation of p38 MAP kinase, ERK 1/2, and NF-κB signaling pathways after a single bout of exercise. Additionally, the increase in plasma IL-6 elicited by exercise was decreased in apocynin-treated mice compared with the exercised vehicle-group (p < 0.001). These results were corroborated using gp91-dstat in an in vitro exercise model. In conclusion, NOX2 inhibition by both apocynin and gp91dstat, alters the intracellular signaling to exercise and electrical stimuli in skeletal muscle, suggesting that NOX2 plays a critical role in molecular response to an acute exercise.

Original languageEnglish (US)
Article number282
JournalFrontiers in Physiology
Volume7
Issue numberJUL
DOIs
StatePublished - Jul 14 2016

Keywords

  • Antioxidant defense
  • IL-6
  • Muscle adaptation
  • NADPH oxidase
  • Reactive oxygen species
  • Redox signaling

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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