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• W2076945242 abstract "Metals are known to induce the formation of reactive oxygen species (ROS) that initiate oxidative stress, an important mechanism of cell injury. The brain is particularly sensitive to oxidative attack because of its high level of unsaturated lipids and high rate of oxidative metabolism. The objective of this study was to determine if elemental mercury (Hg(0)) vapor inhalation increases ROS production and affects activities or levels of antioxidant-related biomolecules in the rat brain and kidney. Adult female Sprague-Dawley rats were exposed for 2 h per day for 11 consecutive days to Hg(0) vapor (1, 2, and 4 mg Hg(0) m(-3)). Brain regions (frontal cortex, cerebellum, brain stem) and kidney were assayed for total Hg, ROS and glutathione (GSH) levels, and for enzyme activities of glutathione peroxidase (GPx) and superoxide dismutase (SOD). Marked exposure-related increases (2500-5600-fold) in total Hg were detected in the brain regions and in kidney. A statistically significant increase in ROS production (ca. 30% above controls) was observed only in the cortex of rats exposed to 1 mg m(-3) Hg vapor, but no significant changes were apparent at other exposures. Although a trend towards increasing ROS production was observed in the kidney, these effects were not statistically significant. Mercury vapor exposure had no significant effects on GSH levels or GPx activity in the three brain regions, however, statistically significant decreases in GSH and GPx activity were detected in the kidneys of rats exposed to 2 mg m(-3). Mercury exposure did not cause significant effects on SOD activity in the brain or kidney. The data indicate that oxidative stress and changes in GSH and activities of antioxidant enzymes do not play a major role in Hg(0) vapor toxicity in brain and kidney." @default.
• W2076945242 created "2016-06-24" @default.
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• W2076945242 date "2002-01-01" @default.
• W2076945242 modified "2023-10-10" @default.
• W2076945242 title "Effects of mercury vapor inhalation on reactive oxygen species and antioxidant enzymes in rat brain and kidney are minimal" @default.
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• W2076945242 doi "https://doi.org/10.1002/jat.844" @default.
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