title: [Tiron as a spin-trap for superoxide radicals produced by the respiratory chain of submitochondrial particles].
abstract: Tiron can be used as a spin-trap for O2 radicals generated by the respiratory chain of submitochondrial particles (SMP). Using this sensitive method, it was shown that the O2 (radical) production by the succinate-oxidizing SMP can be reduced by antimycin or 4-nonyl-2-hydroxyquinoline-N-oxide, the effects of both antibiotics being abolished and prevented by cyanide. It is suggested tht the O2 radicals are produced due to autooxidation of ubisemiquinone which is formed as an intermediate upon one-electron oxidation of CoQH2 by cytochrome c1. The effects of antimycin, 2-nonyl-4-hydroxyquinoline-N-oxide and cyanide on the O2 (radical) generation correlate with the effects of these inhibitors on a steady-state concentration of ubisemiquinone predicted by the Mitchell's Q-cycle hypothesis.
mesh_terms: D014013:1,2-Dihydroxybenzene-3,5-Disulfonic Acid Disodium Salt; D000818:Animals; D001557:Benzenesulfonates; D003575:Cytochromes c1 / Q000378:metabolism; D004579:Electron Transport; D007700:Kinetics; D008928:Mitochondria / Q000378:metabolism*; D008930:Mitochondria, Liver / Q000378:metabolism; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption; D051381:Rats; D013367:Submitochondrial Particles / Q000378:metabolism*; D013386:Succinates / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism*
chemical_list: D001557:Benzenesulfonates; D013386:Succinates; D013481:Superoxides; D014013:1,2-Dihydroxybenzene-3,5-Disulfonic Acid Disodium Salt; D003575:Cytochromes c1; D010100:Oxygen
vernacular_title: Tairon kak spinovaia lovushka dlia superoksidnykh radikalov, obrazuemykh dykhatel'noĭ tsep'iu sybmitokhondrial'nykh chastits.