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Assessment of oxidative stress induced by gold nanorods following intra-tracheal instillation in rats.
Drug and Chemical Toxicology 2018 April
Gold nanorods (GNRs) are used for their wide variety of applications in various industries. There is a little availability of data related to toxicity and ecological implications of these GNRs. The study evaluated the oxidative stress induction following intra-tracheal instillation of 1 and 5 mg/kg b.w. doses of 10 and 25 nm GNRs by estimating various oxidative stress markers including lipid peroxidation (malondialdehyde; MDA), glutathione (GSH), superoxide dismutase (SOD), catalase and total antioxidant capacity (TAC) after 1 day, 1 week, 1 month, and 3 months post exposure periods. The results have shown increased MDA levels and decreased GSH levels following 1 day and 1 week post exposure periods, indicating induction of oxidative stress. Also, the SOD, catalase and TAC levels were significantly decreased following exposure of both 10 and 25 nm GNRs after 1 day and 1 week after exposures, indicating the inhibition of antioxidant defense mechanisms. Moreover, the 10 nm GNRs at 5 mg/kg dose displayed greater changes in all the estimated parameters, representing dose and size based induction of oxidative stress by GNRs. In contrast, a little change was observed during 1 month and 3 months post exposure periods, may be due to recovery. Finally, the GNRs induced dose-size-dependent oxidative stress induction by various oxidative stress markers following intra-tracheal instillation in rats.
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