Mitochondrial toxicity of phthalate esters.
The effects of mono- and dibutyl phthalate and mono- and di(2-ethylhexyl) phthalate on energy-dependent K+ uptake, respiration rates, and succinate cytochrome c reductase activities of isolated rat liver mitochondria were evaluated. The energy-coupling processes, active K+ transport and oxidative phosphorylation, were affected most by di-n-butyl phthalate and mono(2-ethylhexyl) phthalate. Mono-n-butyl phthalate had a moderate effect on energy coupling and di(2-ethylhexyl) phthalate had no apparent effect. The potency of inhibition of succinate cytochrome c reductase activity was mono(2-ethylhexyl) phthalate greater than di-n-butyl phthalate greater than mono-n-butyl phthalate = di(2-ethylhexyl) phthalate. It is concluded that phthalate esters affect mitochondrial activities by altering the permeability properties of the inner membrane and by inhibiting succinate dehydrogenase activity.
D000818:Animals; D004579:Electron Transport / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D008930:Mitochondria, Liver / Q000187:drug effects*; D010795:Phthalic Acids / Q000494:pharmacology / Q000633:toxicity*; D011188:Potassium / Q000378:metabolism; D051381:Rats; D013385:Succinate Dehydrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism
D010795:Phthalic Acids; D013385:Succinate Dehydrogenase; D011188:Potassium