title: The pH sensitivity of H2O2 metabolism in skeletal muscle mitochondria.
abstract: Mitochondria have the capacity to produce and consume H2O2. We examined H2O2 metabolism in isolated rat skeletal muscle mitochondria and found that the substrate-dependent capacity to consume extramitochondrial H2O2 was markedly higher than the observed rate of H2O2 efflux from mitochondria under the same conditions. The substrate-dependent capacity to consume H2O2 was sensitive to the pH of the medium and we propose that pH related differences in H2O2 consumption pathways may explain inconsistencies we observed between H2O2 efflux rate and the reduction state of the matrix NADH pool.
authors.affiliation: Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada.
authors.forename: Sheena
authors.initials: S
authors.lastname: Banh
authors.forename: Jason R
authors.initials: JR
authors.lastname: Treberg
mesh_terms: D000818:Animals; D019069:Cell Respiration; D006861:Hydrogen Peroxide / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008297:Male; D053078:Membrane Potential, Mitochondrial; D008928:Mitochondria / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000166:cytology*; D009243:NAD / Q000378:metabolism; D010084:Oxidation-Reduction; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D009243:NAD; D006861:Hydrogen Peroxide