Mitochondrial permeability transition as a potential determinant of hepatotoxicity of antidiabetic thiazolidinediones

Toxicology
Y MasubuchiT Horie

Abstract

Troglitazone, a thiazolidinedione class of antidiabetic agent, causes serious idiosyncratic hepatotoxicity. Troglitazone is metabolized to a reactive metabolite that covalently binds to cellular macromolecules, but the role of the covalent adduct in the hepatotoxicity is controversial. Because troglitazone has been found to cause cytotoxicity to hepatocytes along with mitochondrial dysfunction, we investigated the effects of troglitazone and other thiazolidinediones on mitochondrial function by using liver mitochondria fraction isolated from male CD-1 mice. Incubation of energized mitochondria with succinate in the presence of Ca2+ and troglitazone induced mitochondrial swelling, and the swelling was partially inhibited by cyclosporin A. Troglitazone also induced decreases in mitochondrial membrane potential and mitochondrial Ca2+ accumulation. These results demonstrate that troglitazone induces mitochondrial permeability transition (MPT). Similar results were obtained for ciglitazone, whereas rosiglitazone and pioglitazone, which are less hepatotoxic than troglitazone, had little effect on these mitochondria functions. It is therefore possible that the troglitazone-induced opening of MPT pore, which is not induced by rosiglita...Continue Reading

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