Loureiro 2016 Oxid Med Cell Longev
|Loureiro AC, do Rêgo-Monteiro IC, Louzada RA, Ortenzi VH, de Aguiar AP, de Abreu ES, Cavalcanti-de-Albuquerque JP, Hecht F, de Oliveira AC, Ceccatto VM, Fortunato RS, Carvalho DP (2016) Differential expression of NADPH oxidases depends on skeletal muscle fiber type in rats. Oxid Med Cell Longev 2016:6738701.|
Loureiro AC, do Rego-Monteiro IC, Louzada RA, Ortenzi VH, de Aguiar AP, de Abreu ES, Cavalcanti-de-Albuquerque JP, Hecht F, de Oliveira AC, Ceccatto VM, Fortunato RS, Carvalho DP (2016) Oxid Med Cell Longev
Abstract: NADPH oxidases (NOX) are important sources of reactive oxygen species (ROS) in skeletal muscle, being involved in excitation-contraction coupling. Thus, we aimed to investigate if NOX activity and expression in skeletal muscle are fiber type specific and the possible contribution of this difference to cellular oxidative stress. Oxygen consumption rate, NOX activity and mRNA levels, and the activity of catalase (CAT), glutathione peroxidase (GPX), and superoxide dismutase (SOD), as well as the reactive protein thiol levels, were measured in the soleus (SOL), red gastrocnemius (RG), and white gastrocnemius (WG) muscles of rats. RG showed higher oxygen consumption flow than SOL and WG, while SOL had higher oxygen consumption than WG. SOL showed higher NOX activity, as well as NOX2 and NOX4 mRNA levels, antioxidant enzymatic activities, and reactive protein thiol contents when compared to WG and RG. NOX activity and NOX4 mRNA levels as well as antioxidant enzymatic activities were higher in RG than in WG. Physical exercise increased NOX activity in SOL and RG, specifically NOX2 mRNA levels in RG and NOX4 mRNA levels in SOL. In conclusion, we demonstrated that NOX activity and expression differ according to the skeletal muscle fiber type, as well as antioxidant defense.
Labels: MiParea: Respiration, Exercise physiology;nutrition;life style
Organism: Rat Tissue;cell: Skeletal muscle Preparation: Permeabilized tissue
Coupling state: LEAK, OXPHOS Pathway: N, CIV, NS, ROX HRR: Oxygraph-2k