title: The restorative action of coenzyme Q10 in 2,4-dinitrophenol-depressed electrical and contractile activities of guinea-pig heart.
abstract: With electrophysiological methods, mechanisms of the restorative action of coenzyme Q10 (CoQ10) in 2,4-dinitrophenol-depressed electrical and mechanical activities of isolated guinea-pig hearts were studied. Isoproterenol (3 X 10(-8) M)-induced action potential and contraction of the heart in 27 mM KCl Tyrode solution were abolished by 6 X 10(-6) M 2,4-dinitrophenol, while the additional application of CoQ10 (50 micrograms/ml) restored both these activities of the heart. This restorative action of CoQ10 was dose related (2 to 50 micrograms/ml) and was inhibited by 10 micrograms/ml 15-hydroperoxyarachidonic acid (15-HPAA) or pretreatment of the animals with indomethacin (5 mg/kg i.v.). When exogenously applied, 200 ng/ml prostacyclin also restored the 2,4-dinitrophenol-depressed electrical and contractile activities of the heart, but this restorative action of prostacyclin was affected neither by 15-HPAA nor by indomethacin pretreatment. These results suggest the possible participation of prostacyclin in the restorative action of CoQ10 in 2,4-dinitrophenol-depressed electrical and mechanical activities of the heart.
mesh_terms: D019297:2,4-Dinitrophenol; D000818:Animals; D001095:Arachidonic Acids / Q000494:pharmacology; D003067:Coenzymes; D004140:Dinitrophenols / Q000494:pharmacology*; D004336:Drug Antagonism; D004558:Electric Stimulation; D011464:Epoprostenol / Q000494:pharmacology; D005071:Evoked Potentials / Q000187:drug effects; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects* / Q000502:physiology; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D015289:Leukotrienes; D008054:Lipid Peroxides / Q000494:pharmacology; D009200:Myocardial Contraction / Q000187:drug effects*; D010210:Papillary Muscles / Q000187:drug effects; D014451:Ubiquinone / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D001095:Arachidonic Acids; D003067:Coenzymes; D004140:Dinitrophenols; D015289:Leukotrienes; D008054:Lipid Peroxides; D014451:Ubiquinone; C025086:15-hydroperoxy-5,8,11,13-eicosatetraenoic acid; D011464:Epoprostenol; C024989:coenzyme Q10; D007545:Isoproterenol; D019297:2,4-Dinitrophenol; D007213:Indomethacin