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• W2023140942 startingPage "185" @default.
• W2023140942 abstract "To examine chronic effects of methylmercury (MeHg), male Wistar rats were fed on MeHg-contaminated diet, 0, 1 and 5 ppm Hg, under a restricted feeding schedule of 16 g/rat/day for 6 days a week. Rats were killed at 6-month intervals for examination of Hg accumulation, tissue levels of glutathione, metallothionein and lipid peroxide, as well as anti-oxidative enzyme activities. The survival of the 5 ppm Hg group, 50% of which died by the end of 32nd month of the exposure, was somewhat shorter than control and 1 ppm Hg groups, 50% of which survived for 34 months. Although the rats showed no neurological signs or decreased body weight gain even in 5 ppm Hg-exposed group until the end of the 2nd year, crossing of hind limb was evident after 2.5 years in all three groups. Accordingly, the neurological sign observed here possibly due to aging rather than MeHg toxicity. Tissue Hg levels showed a dose-dependent accumulation except for the kidney, where the highest Hg accumulation was observed among tissues examined. Renal Hg levels in the 1 ppm group showed about 40% of those in the 5 ppm group. Significant effects by MeHg were evident only in the kidney, where glutathione and metallothionein levels increased in both MeHg-exposed groups. However, lipid peroxide levels elevated only in 1 ppm group. Among the antioxidative enzymes examined, the renal glutathione peroxidase was found to be the most labile enzyme against MeHg exposure. Renal dysfunction suggested by increased plasma creatinine levels was also significant in 5 ppm Hg rats at 2 years. Furthermore, anemia which would be caused by reduced erythropoietin production in the kidney was also evident in this group. The present study suggested that the kidney was the most susceptible organ against MeHg toxicity under the present exposure schedule and that the renal dysfunction might at least partly account for the shortened survival in 5 ppm Hg rats." @default.
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• W2023140942 date "1997-01-01" @default.
• W2023140942 modified "2023-10-16" @default.
• W2023140942 title "Chronic Effects of Methylmercury in Rats. I. Biochemical Aspects." @default.
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• W2023140942 doi "https://doi.org/10.1620/tjem.182.185" @default.
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