title: [Stimulation by quinones of cyanide-resistant respiration in rat liver and heart mitochondria].
abstract: It was shown that hydrophilic benzo- and naphthoquinones stimulate the cyanide-resistant respiration in liver and muscle mitochondria when succinate or NADH and glutamate or malate are used as oxidation substrates. The substrate-dependent oxygen uptake in the presence of cyanide is initiated by menadione, vicasol, 1.2-naphthoquinone, coenzyme Q0 and duroquinone. Rotenone and antimycin A do not inhibit the cyanide-resistant respiration. Oxidation of glutamate and malate in the course of CN-resistant respiration is inhibited by ortho- and bathophenanthroline and p-chloromercurybenzoate, whereas succinate oxidation by tenoyltrifluoroacetone, carboxin and pentachlorophenol. Superoxide dismutase, Cu2+ and catalase inhibit the CN-resistant respiration in the presence of quinones. Addition of catalase to the experimental cell causes O2 release.
mesh_terms: D000818:Animals; D003486:Cyanides / Q000494:pharmacology*; D004579:Electron Transport; D066298:In Vitro Techniques; D007700:Kinetics; D008929:Mitochondria, Heart / Q000187:drug effects / Q000378:metabolism*; D008930:Mitochondria, Liver / Q000187:drug effects / Q000378:metabolism*; D010084:Oxidation-Reduction; D010101:Oxygen Consumption / Q000187:drug effects*; D011809:Quinones / Q000494:pharmacology*; D051381:Rats; D013268:Stimulation, Chemical
chemical_list: D003486:Cyanides; D011809:Quinones
vernacular_title: Stimuliatsiia khinonami tsianidrezistentnogo dykhaniia v mitokhondriiakh pecheni i serdtsa krys.