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• W2127372273 abstract "Background Nuclear factor (NF)-κB activation and oxidative stress are physiologic responses of skeletal muscle to exercise but may be impaired in patients with COPD. Therefore, we investigated NF-κB activity and expression of NF-κB-regulated genes in muscle of patients with COPD and control subjects before and after exercise. Methods Quadriceps specimens were obtained before, immediately after, and 2 h after a submaximal cycle ergometry test from seven patients with COPD (50.6 ± 5.7 SEM FEV1 of patients with COPD) and seven age-matched control subjects. NF-κB DNA-binding activity in muscle and peripheral blood mononuclear cells (PBMCs) was determined using electrophoretic mobility shift assay and enzyme-linked immunosorbent assay, respectively. mRNA expression and protein carbonylation were measured by real-time polymerase chain reaction and Western blot, respectively. Results In control subjects, IL-6, IκBα, tumor necrosis factor-α, IL-1β, superoxide dismutase, thioredoxin, heme oxygenase 1, and heat shock protein-70 were upregulated in muscle after exercise, whereas in patients with COPD only IL-6 mRNA was increased. Exercise-induced antiapoptotic Bcl2 mRNA levels were attenuated in patients with COPD compared with control subjects. Basal muscle protein oxidation was higher in patients with COPD than in control subjects, but attenuated in response to exercise. No exercise-induced changes in NF-κB DNA-binding activity in muscle and PBMCs of either group were detected. Conclusions Skeletal muscle of patients with COPD is characterized by an impaired response to exercise of NF-κB-regulated genes encoding inflammatory cytokines, antioxidants, stress proteins, and survival factors. Nuclear factor (NF)-κB activation and oxidative stress are physiologic responses of skeletal muscle to exercise but may be impaired in patients with COPD. Therefore, we investigated NF-κB activity and expression of NF-κB-regulated genes in muscle of patients with COPD and control subjects before and after exercise. Quadriceps specimens were obtained before, immediately after, and 2 h after a submaximal cycle ergometry test from seven patients with COPD (50.6 ± 5.7 SEM FEV1 of patients with COPD) and seven age-matched control subjects. NF-κB DNA-binding activity in muscle and peripheral blood mononuclear cells (PBMCs) was determined using electrophoretic mobility shift assay and enzyme-linked immunosorbent assay, respectively. mRNA expression and protein carbonylation were measured by real-time polymerase chain reaction and Western blot, respectively. In control subjects, IL-6, IκBα, tumor necrosis factor-α, IL-1β, superoxide dismutase, thioredoxin, heme oxygenase 1, and heat shock protein-70 were upregulated in muscle after exercise, whereas in patients with COPD only IL-6 mRNA was increased. Exercise-induced antiapoptotic Bcl2 mRNA levels were attenuated in patients with COPD compared with control subjects. Basal muscle protein oxidation was higher in patients with COPD than in control subjects, but attenuated in response to exercise. No exercise-induced changes in NF-κB DNA-binding activity in muscle and PBMCs of either group were detected. Skeletal muscle of patients with COPD is characterized by an impaired response to exercise of NF-κB-regulated genes encoding inflammatory cytokines, antioxidants, stress proteins, and survival factors." @default.
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• W2127372273 date "2011-02-01" @default.
• W2127372273 modified "2023-10-16" @default.
• W2127372273 title "Decreased Exercise-Induced Expression of Nuclear Factor-κB-Regulated Genes in Muscle of Patients With COPD" @default.
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• W2127372273 doi "https://doi.org/10.1378/chest.10-0275" @default.
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