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• W2088394421 endingPage "323" @default.
• W2088394421 startingPage "319" @default.
• W2088394421 abstract "Iodine, bivalent iron (Fe²⁺), and hydrogen peroxide (H₂O₂), all significantly affecting the red-ox balance, are required for thyroid hormone synthesis. Intracellular iodine excess (≥10⁻³ M) transiently blocks thyroid hormonogenesis (an adaptive mechanism called Wolff-Chaikoff effect). The aim of the study was to evaluate the effects of iodine, used as potassium iodide (KI) or potassium iodate (KIO₃), in concentrations corresponding to those typical for Wolff-Chaikoff effect, on the level of oxidative damage to nuclear DNA (nDNA) and mitochondrial DNA (mtDNA) isolated from porcine thyroid under basal conditions and in the presence of Fenton reaction (Fe²⁺+H₂O₂ → Fe³⁺+(·)OH + OH⁻) substrates.Thyroid nDNA and mtDNA were incubated in the presence of either KI or KIO₃ (2.5-50 mM), without/with FeSO₄ (30 µM) + H₂O₂ (0.5 mM). Index of DNA damage, i.e., 8-oxo-7,8-dihydro-2'-deoxyguanosine, was measured by HPLC.Neither KI nor KIO₃ increased the basal level of 8-oxodG in both nDNA and mtDNA. KI-in all used concentrations-completely prevented the damaging effect of Fenton reaction substrates in mtDNA, and it partially prevented this damage in nDNA. KIO₃ partially prevented Fe²⁺+H₂O₂-induced oxidative damage in both DNA only in its highest used concentrations (≥25 mM).Without additional prooxidative abuse, both iodine compounds, i.e., KI and KIO₃, seem to be safe in terms of their potential oxidative damage to DNA in the thyroid. The superiority of KI over KIO₃ relies on its stronger protective effects against oxidative damage to mtDNA, which constitutes an argument for its preferential utility in iodine prophylaxis." @default.
• W2088394421 created "2016-06-24" @default.
• W2088394421 creator A5044807382 @default.
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• W2088394421 date "2014-11-09" @default.
• W2088394421 modified "2023-10-17" @default.
• W2088394421 title "Protective effect of KI in mtDNA in porcine thyroid: comparison with KIO3 and nDNA" @default.
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• W2088394421 doi "https://doi.org/10.1007/s00394-014-0797-6" @default.
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