title: Biological validation of coenzyme Q redox state by HPLC-EC measurement: relationship between coenzyme Q redox state and coenzyme Q content in rat tissues.
abstract: The properties of coenzymes Q (CoQ9 and CoQ10) are closely linked to their redox state (CoQox/total CoQ) x 100. In this work, CoQ redox state was biologically validated by high performance liquid chromatography-electrochemical measurement after modulation of mitochondrial electron flow of cultured cells by molecules increasing (rotenone, carbonyl cyanide chlorophenylhydrazone) or decreasing (antimycin) CoQ oxidation. The tissue specificity of CoQ redox state and content were investigated in control and hypoxic rats. In control rats, there was a strong negative linear regression between tissular CoQ redox state and CoQ content. Hypoxia increased CoQ9 redox state and decreased CoQ9 content in a negative linear relationship in the different tissues, except the heart and lung. This result demonstrates that, under conditions of mitochondrial impairment, CoQ redox control is tissue-specific.
authors.affiliation: Laboratoire de Biochimie Générale et Nutritionnelle, Place du Docteur Baylac, CHU Purpan, 31049 Toulouse Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Galinier
authors.forename: A
authors.initials: A
authors.lastname: Carrière
authors.forename: Y
authors.initials: Y
authors.lastname: Fernandez
authors.forename: A M
authors.initials: AM
authors.lastname: Bessac
authors.forename: S
authors.initials: S
authors.lastname: Caspar-Bauguil
authors.forename: B
authors.initials: B
authors.lastname: Periquet
authors.forename: M
authors.initials: M
authors.lastname: Comtat
authors.forename: J P
authors.initials: JP
authors.lastname: Thouvenot
authors.forename: L
authors.initials: L
authors.lastname: Casteilla
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D004579:Electron Transport / Q000502:physiology; D000860:Hypoxia / Q000378:metabolism; D008297:Male; D051379:Mice; D008928:Mitochondria / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D051381:Rats; D017208:Rats, Wistar; D012044:Regression Analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014018:Tissue Distribution; D014451:Ubiquinone / Q000737:chemistry / Q000378:metabolism*
chemical_list: D014451:Ubiquinone