title: Oral administration of coenzyme Q(10) prevents cytochrome c release from mitochondria induced by 1-methyl-4-phenylpyridinium ion in mouse brain synaptosomes.
abstract: Coenzyme Q(10) (CoQ(10)) exerts neuroprotective effects in several in vivo and in vitro models of neurodegenerative disorders. However, the mechanisms of action are not fully understood. The aim in this study was to investigate whether oral administration of CoQ(10) could inhibit cytochrome c (cyt c) release from mitochondria induced by 1-methyl-4-phenylpyridinium ion (MPP(+)), which causes dopaminergic cell death by selective inhibition of complex I of the electron transport chain, in mouse brain synaptosomes. An increase of cyt c was detected in the cytosolic fraction from mouse brain synaptosomes treated with MPP(+). Oral administration of CoQ(10) prevented the mitochondrial cyt c release in the MPP(+)-treated synaptosomes. In addition, CoQ(10) did not affect the MPP(+)-induced decrease in mitochondrial oxidation-reduction activity and membrane potential in brain synaptosomes. Our findings demonstrate that MPP(+)-induced mitochondrial cyt c release in brain synaptosomes is prevented by oral administration of CoQ(10) independently of mitochondrial dysfunction prior to the cyt c release.
authors.affiliation: Department of Alternative Medicine and Experimental Therapeutics, Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Ishikawa 920-1181, Japan. y-mitsumoto@hokuriku-u.ac.jp
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Mitsumoto
authors.forename: Shota
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Matsushima
authors.forename: Akiko
authors.initials: A
authors.lastname: Muroyama
authors.forename: Ikuo
authors.initials: I
authors.lastname: Yoshimura
mesh_terms: D015655:1-Methyl-4-phenylpyridinium / Q000494:pharmacology*; D000284:Administration, Oral; D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000378:metabolism; D045304:Cytochromes c / Q000378:metabolism*; D008297:Male; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D008928:Mitochondria / Q000187:drug effects* / Q000378:metabolism; D018696:Neuroprotective Agents / Q000008:administration & dosage / Q000494:pharmacology*; D010084:Oxidation-Reduction; D013574:Synaptosomes / Q000187:drug effects* / Q000378:metabolism; D014451:Ubiquinone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D018696:Neuroprotective Agents; D014451:Ubiquinone; D045304:Cytochromes c; C024989:coenzyme Q10; D015655:1-Methyl-4-phenylpyridinium