Interaction of yeast mitochondria with fatty acids and mitochondria-targeted lipophilic cations

• Published in: Biochemistry (Moscow) 2010-02, Vol.75 (2), p.139-144
• Main Authors: Sukhanova, E. I, Trendeleva, T. A, Zvyagilskaya, R. A
• Format: Article
• Language: English
• Subjects: Animals; Biochemistry; Biomedical and Life Sciences; Biomedicine; Bioorganic Chemistry; Cations; Cations - chemistry; Cations - metabolism; Cations - pharmacology; Cattle; Detergents - chemistry; Detergents - metabolism; Detergents - pharmacology; Dipodascus; Dipodascus - cytology; Dipodascus - drug effects; Dipodascus - metabolism; Dose-Response Relationship, Drug; Electrochemistry; Fatty acids; Fatty Acids, Unsaturated - metabolism; Fatty Acids, Unsaturated - pharmacology; Hydrophobic and Hydrophilic Interactions; Life Sciences; Membrane Potential, Mitochondrial - drug effects; Membranes; Microbiology; Mitochondria - drug effects; Mitochondria - metabolism; Mitochondrial DNA; Oxidation; Reactive Oxygen Species - chemistry; Reactive Oxygen Species - metabolism; Reactive Oxygen Species - pharmacology; Uncoupling Agents - chemistry; Uncoupling Agents - metabolism; Uncoupling Agents - pharmacology; Unsaturated fatty acids; Yarrowia - cytology; Yarrowia - drug effects; Yarrowia - metabolism; Yarrowia lipolytica; Yeast; Yeasts
• ISSN: 0006-2979; 1608-3040
• DOI: 10.1134/S0006297910020033

The effect of fatty acids and mitochondria-targeted lipophilic cations (SkQ1, SkQ3, MitoQ, and C₁₂TPP) on tightly-coupled mitochondria from yeasts Dipodascus (Endomyces) magnusii and Yarrowia lipolytica was investigated. Micromolar concentrations of saturated and unsaturated fatty acids were found to decrease the membrane potential, which was recovered almost totally by ATP and BSA. At low, micromolar concentrations, mitochondria-targeted lipophilic cations are “relatively weak, mild uncouplers”, at higher concentrations they inhibit respiration in state 3, and at much higher concentrations they induce swelling of mitochondria, possibly due to their prooxidant and detergent action. At very low, not uncoupling concentrations, mitochondria-targeted lipophilic cations profoundly promote (potentiate) the uncoupling effect of fatty acids. It is conceivable that the observed uncoupling effect of lipophilic cations can be, at least partially, due to their interactions with the endogenous pool of fatty acids.