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• W2078925034 abstract "Disulfiram (Ds), a clinically employed alcohol deterrent of the thiuram disulfide (TD) class of compounds, is known to cause hepatitis and neuropathies. Although this drug has been shown to inhibit different thiol-containing enzymes, the actual mechanism of Ds toxicity is not clear. We have previously demonstrated that Ds impairs the permeability of inner mitochondrial membrane (IMM) [Arch. Biochem. Biophys. 356 (1998) 46]. In this report, the effect of Ds and its structural analogue thiram (Th) on mitochondrial functions was studied in detail. We found that mitochondria metabolize TDs in a NAD(P)H- and GSH-dependent manner. At the concentration above characteristic threshold, TDs induced irreversible oxidation of NAD(P)H and glutathione (GSH) pools, collapse of transmembrane potential, and inhibition of oxidative phosphorylation. The presence of Ca2+ and exhaustion of mitochondrial glutathione (GSH+GSSG) decreased the threshold concentration of TDs. Swelling of the mitochondria and leakage of non-transported fluorescent dye BCECF from the matrix indicated that TDs induced the mitochondrial permeability transition (MPT). Mitochondrial permeabilization by TDs involves two, apparently distinct mechanisms. In the presence of Ca2+, TDs produced cylosporin A-sensitive swelling of mitochondria, which was inhibited by ADP and accelerated by carboxyatractyloside (CATR) and phosphate. In contrast, the swelling produced by TDs in the absence of Ca2+ was not sensitive to cyclosporin A (CsA), ADP and CATR but was inhibited by phosphate. Titration with N-ethylmaleimide revealed that these two mechanisms involve different SH-groups and probably different transport proteins on the IMM. Our findings indicate that at pharmacologically relevant concentrations TDs may cause an irreversible mitochondrial injury as a result of induction of the MPT." @default.
• W2078925034 created "2016-06-24" @default.
• W2078925034 creator A5015237970 @default.
• W2078925034 creator A5026326169 @default.
• W2078925034 date "2001-12-01" @default.
• W2078925034 modified "2023-09-30" @default.
• W2078925034 title "Mitochondrial injury by disulfiram: two different mechanisms of the mitochondrial permeability transition" @default.
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• W2078925034 doi "https://doi.org/10.1016/s0009-2797(01)00283-6" @default.
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