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• W2024741520 abstract "We have recently suggested antioxidant therapy against aminoglycoside-induced hearing loss based on the hypothesis of a redox-active aminoglycoside-iron complex causing ototoxicity. The present study compares seven antioxidants and iron chelators for their ability to attenuate gentamicin-induced free radical generation in vitro and ototoxicity in guinea pig in vivo. Free radical formation by gentamicin was measured by chemiluminescence detection both in a non-enzymatic system in vitro and in cell culture. Deferoxamine, 2,3-dihydroxybenzoate, or salicylic acid suppressed gentamicin-induced luminescence in both tests. This indicated the usefulness of the assay as a screen for potential protectants since these agents had previously been shown to attenuate gentamicin-induced ototoxicity in vivo. Histidine and D-methionine, amino acids with chelating and antioxidant properties, also suppressed gentamicin-mediated luminosity both in vitro and in cell culture. In contrast, the metal chelators succimer (2,3-dimercaptosuccinic acid (DMSA)) and trientine (N,N′-bis[2-aminoethyl]-1,2 ethanediamine) promoted free radical formation and were excluded from further studies. Histidine and D-methionine were then administered to guinea pigs receiving concurrent treatment with gentamicin (120 mg/kg×19 days). Threshold shifts induced by gentamicin were significantly attenuated by twice-daily injections of D-methionine. Once-daily injections of histidine or D-methionine were less effective, pointing to the importance of pharmacokinetics in antioxidant protection in vivo. The study presents a simple screening system for agents with the potential to attenuate gentamicin-induced hearing loss. It also supports the hypothesis of free radical formation as an underlying cause of gentamicin ototoxicity." @default.
• W2024741520 created "2016-06-24" @default.
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• W2024741520 date "2000-04-01" @default.
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• W2024741520 title "Antioxidants attenuate gentamicin-induced free radical formation in vitro and ototoxicity in vivo: D-methionine is a potential protectant" @default.
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• W2024741520 doi "https://doi.org/10.1016/s0378-5955(00)00003-4" @default.
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