Altered mitochondrial regulation in quadriceps muscles of patients with COPD

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Ashley I Naimi, Jean Bourbeau, Helene Perrault, Jacinthe Baril, Cynthia Wright-Paradis, Amanda Rossi, Tanja Taivassalo, A William Sheel, Rasmus Rabøl, Flemming Dela, Robert Christopher Boushel

Evidence exists for locomotor muscle impairment in patients with chronic obstructive pulmonary disease (COPD), including fiber type alterations and reduced mitochondrial oxidative capacity. In this study high-resolution respirometry was used to quantify oxygen flux in permeabilized fibres from biopsies of the vastus lateralis muscle in patients with COPD and compared to healthy control subjects. The main findings of this study were that (i) routine state 2 respiration was higher in COPD; (ii) state 3 respiration in the presence of ADP was similar in both groups with substrate supply of electrons to complex I (COPD 38·28 ± 3·58 versus control 42·85 ± 3·10 pmol s-1 mg tissue-1), but O2 flux with addition of succinate was lower in COPD patients (COPD 63·72 ± 6·33 versus control 95·73 ± 6·53 pmol s-1 mg tissue-1); (iii) excess capacity of cytochrome c oxidase in COPD patients was only ~50% that of control subjects. These results indicate that quadriceps muscle mitochondrial function is altered in patients with COPD. The regulatory mechanisms underlying these functional abnormalities remain to be uncovered.
TidsskriftClinical Physiology and Functional Imaging
Udgave nummer2
Sider (fra-til)124-31
Antal sider8
StatusUdgivet - 2011

ID: 33815758