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• W2094340596 endingPage "878" @default.
• W2094340596 startingPage "870" @default.
• W2094340596 abstract "The toxicity paradigm used in the present study involves exposure of U937 cells to a concentration of authentic peroxynitrite, leading to a rapid necrotic response mediated by mitochondrial permeability transition. We found that addition of catalase after treatment with peroxynitrite specifically prevents the loss of mitochondrial membrane potential and the ensuing lethal response. The protective effects of catalase were mimicked by the cocktail glutathione peroxidase/reduced glutathione. A defensive role of intracellular catalase was implied by experiments showing that catalase-depleted cells are hypersensitive to peroxynitrite and that cells with an increased catalase content, selected for their resistance to H(2)O(2), are cross-resistant to peroxynitrite. Further experiments demonstrated that H(2)O(2) formation takes place after peroxynitrite exposure. Various approaches using inhibitors of the mitochondrial respiratory chain as well as respiration-deficient cells revealed that the oxidant is produced upon dismutation of superoxides generated at the level of complex III. Interestingly, respiration-deficient cells were found to be resistant to peroxynitrite toxicity, and all those treatments increasing formation of H(2)O(2) produced a parallel increase in toxicity. In conclusion, the results presented in this study indicate that peroxynitrite-induced impairment of electron transport from cytochrome b to cytochrome c1 leads to delayed formation of hydrogen peroxide, which plays a pivotal role in the ensuing necrotic response." @default.
• W2094340596 created "2016-06-24" @default.
• W2094340596 creator A5024130549 @default.
• W2094340596 creator A5079220891 @default.
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• W2094340596 date "2002-04-01" @default.
• W2094340596 modified "2023-10-18" @default.
• W2094340596 title "Delayed Formation of Hydrogen Peroxide Mediates the Lethal Response Evoked by Peroxynitrite in U937 Cells" @default.
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• W2094340596 doi "https://doi.org/10.1124/mol.61.4.870" @default.
• W2094340596 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11901226" @default.
• W2094340596 hasPublicationYear "2002" @default.
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