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• W2029996404 abstract "Hydrogen peroxide is appreciated as a cellular signaling molecule with second-messenger properties, yet the mechanisms by which the cell protects against intracellular H2O2 accumulation are not fully understood. We introduce a network model of H2O2 clearance that includes the pseudo-enzymatic oxidative turnover of protein thiols, the enzymatic actions of catalase, glutathione peroxidase, peroxiredoxin, and glutaredoxin, and the redox reactions of thioredoxin and glutathione. Simulations reproduced experimental observations of the rapid and transient oxidation of glutathione and the rapid, sustained oxidation of thioredoxin on exposure to extracellular H2O2. The model correctly predicted early oxidation profiles for the glutathione and thioredoxin redox couples across a range of initial extracellular [H2O2] and highlights the importance of cytoplasmic membrane permeability to the cellular defense against exogenous sources of H2O2. The protein oxidation profile predicted by the model suggests that approximately 10% of intracellular protein thiols react with hydrogen peroxide at substantial rates, with a majority of these proteins forming protein disulfides as opposed to protein S-glutathionylated adducts. A steady-state flux analysis predicted an unequal distribution of the intracellular anti-oxidative burden between thioredoxin-dependent and glutathione-dependent antioxidant pathways, with the former contributing the majority of the cellular antioxidant defense due to peroxiredoxins and protein disulfides. Antioxid. Redox Signal. 13, 731–743." @default.
• W2029996404 created "2016-06-24" @default.
• W2029996404 creator A5035904189 @default.
• W2029996404 creator A5048778639 @default.
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• W2029996404 date "2010-09-15" @default.
• W2029996404 modified "2023-10-14" @default.
• W2029996404 title "A Model of Redox Kinetics Implicates the Thiol Proteome in Cellular Hydrogen Peroxide Responses" @default.
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• W2029996404 doi "https://doi.org/10.1089/ars.2009.2968" @default.
• W2029996404 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2935341" @default.
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• W2029996404 hasPublicationYear "2010" @default.
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