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- W2000129340 abstract "Tolcapone and entacapone are catechol-O-methyltransferase (COMT) inhibitors used as adjuncts to levodopa in the treatment of Parkinson's disease (PD). The use of tolcapone has been limited by its hepatotoxicity, the cause of which remains uncertain. Tolcapone compound is an uncoupler of mitochondrial respiration in isolated mitochondria and this action may be relevant to its effect on liver function. We have examined the actions of COMT inhibitors on cultured cells, comparing them with those of the classical uncoupler carbonyl cyanide p-(trifluoromethoxy) phenylhydrazone (FCCP), in order to provide insight into their mechanism of potential toxicity. Tolcapone and FCCP were shown to be toxic to human neuroblastoma SH-SY5Y cells and caused a profound reduction in ATP synthesis. Entacapone was not toxic to SH-SY5Y. Tolcapone and FCCP were shown to be equally toxic to cells depleted of mtDNA and thus devoid of a functional respiratory chain. This study demonstrates that tolcapone markedly inhibits ATP synthesis in cultured cells mirroring the effects of a classical uncoupler. However its toxicity may also involve a mechanism independent of its effects upon oxidative phosphorylation." @default.
- W2000129340 created "2016-06-24" @default.
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- W2000129340 date "2004-03-01" @default.
- W2000129340 modified "2023-10-15" @default.
- W2000129340 title "Differences in toxicity of the catechol-O-methyl transferase inhibitors, tolcapone and entacapone to cultured human neuroblastoma cells" @default.
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- W2000129340 doi "https://doi.org/10.1016/j.neuropharm.2003.10.015" @default.
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