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• W2068428492 abstract "As the mitochondrial electron transport chain (ETC) is necessary for life, its inhibition results in cell death. To date, ETC complex (I-IV) inhibitors (ETCIs) have been thought to induce ATP depletion, triggering cellular apoptosis. To clarify whether the depletion of intracellular ATP is relevant to apoptosis induced by ETCIs, we conducted comparative studies using oxidative phosphorylation inhibitors (OPIs), including a specific F(0)F(1)ATP synthase inhibitor oligomycin, an ionophore valinomycin and an uncoupler 2,4-dinitrophenol, as tools to deplete only ATP without influencing the ETC. In human dopaminergic SH-SY5Y cells, ETCIs (rotenone, thenoyltrifluoroacetone, antimycin A and potassium cyanide) depleted ATP and induced apoptosis. However, OPIs failed to induce apoptosis despite ATP being decreased to an extent comparable to that observed with ETCIs. Reactive oxygen species (ROS) production was augmented by ETCIs, but not by OPIs. Furthermore, ETCI-induced apoptosis was inhibited by the addition of an antioxidant N-acetylcysteine. Apoptosis was induced without ATP depletion by H(2)O(2) at a concentration that generated ROS at an amount comparable to that induced by ETCIs. Our findings demonstrate that ROS production is more relevant than ATP depletion to apoptosis induced by ETCIs." @default.
• W2068428492 created "2016-06-24" @default.
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• W2068428492 date "2007-02-01" @default.
• W2068428492 modified "2023-10-13" @default.
• W2068428492 title "ATP depletion does not account for apoptosis induced by inhibition of mitochondrial electron transport chain in human dopaminergic cells" @default.
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• W2068428492 doi "https://doi.org/10.1016/j.neuropharm.2006.07.037" @default.
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