Antioxidant and prooxidant properties of mitochondrial Coenzyme Q.

TitleAntioxidant and prooxidant properties of mitochondrial Coenzyme Q.
Publication TypeJournal Article
Year of Publication2004
AuthorsJames, AM, Smith, RAJ, Murphy, MP
JournalArch Biochem Biophys
Date Published2004 Mar 01
KeywordsAnimals, Antioxidants, Humans, Hydrophobic and Hydrophilic Interactions, Mitochondria, Oxidants, Oxidation-Reduction, Ubiquinone

Coenzyme Q is both an essential electron carrier and an important antioxidant in the mitochondrial inner membrane. The reduced form, ubiquinol, decreases lipid peroxidation directly by acting as a chain breaking antioxidant and indirectly by recycling Vitamin E. The ubiquinone formed in preventing oxidative damage is reduced back to ubiquinol by the respiratory chain. As well as preventing lipid peroxidation, Coenzyme Q reacts with other reactive oxygen species, contributing to its effectiveness as an antioxidant. There is growing interest in using Coenzyme Q and related compounds therapeutically because mitochondrial oxidative damage contributes to degenerative diseases. Paradoxically, Coenzyme Q is also involved in superoxide production by the respiratory chain. To help understand how Coenzyme Q contributes to both mitochondrial oxidative damage and antioxidant defences, we have reviewed its antioxidant and prooxidant properties.

Alternate JournalArch. Biochem. Biophys.
Citation Key10.1016/
PubMed ID14989264