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- W2025134296 abstract "The liver of 7-day-old rats contains high levels of metallothionein (MT) and zinc, which can be reduced markedly following treatment of neonates with dexamethasone (1 mg/kg, s.c.) twice daily on days 3, 4, 5 and 6 postpartum. Prior treatment with trace amounts of 65Zn and 109Cd did neither alter the basal MT and zinc concentrations nor their response to dexamethasone. The turnover of 65Zn or 109Cd in newborn rats was studied by measuring the whole body retention of the radioisotopes. Between days 3 and 7 postpartum, the normal turnover of 65Zn was much faster than that of 109Cd, and dexamethasone treatment resulted in further decrease of 65Zn retention without significantly altering that of 109Cd. The data indicate that dexamethasone enhanced the excretion of 65Zn without any effect on 109Cd excretion. The dexamethasone treatment resulted in marked reduction in both hepatic Zn and MT levels in newborn rats. Gel filtration on Sephadex G-75 columns of hepatic cytosols isolated from 7-day-old rats showed significant amounts of total Zn and 65Zn bound to MT fraction. Moreover, dexamethasone treatment markedly reduced their binding to the MT fraction suggesting that most of the Zn lost from the liver of dexamethasone-treated animals was from MT. About 95% of 109Cd in the liver cytosol was present in the MT fraction of 109Cd-injected rats and dexamethasone had little effect on the binding of 109Cd to MT fraction despite a marked reduction in the binding of total Zn. These data suggest that unlike in adult rats, injection of dexamethasone results in marked decrease in hepatic levels of Zn and MT in neonatal rats." @default.
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- W2025134296 date "1986-11-01" @default.
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- W2025134296 title "Effects of dexamethasone injection on body retention and hepatic distribution of zinc, cadmium and metallothionein in newborn rats" @default.
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- W2025134296 doi "https://doi.org/10.1016/0300-483x(86)90181-2" @default.
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