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• W2060697948 abstract "The in vivo long-term cytosolic-nuclear kinetics and DNA-binding properties of the Ah receptor were examined in liver from the golden Syrian hamster. For the kinetic studies, a dose of [3H]2,3,7,8-tetrachlorodibenzo-p-dioxin ([3H]TCDD) that has been previously shown to produce maximal and sustained hepatic enzyme induction without substantial toxicity was used. Following an intraperitoneal dose of 10 μg/kg of [3H]TCDD, occupied cytosolic receptor levels reached a peak within 8 h and then decreased rapidly to a level that was approximately 2% of the total receptor. Throughout the 35-day period, unoccupied cytosolic receptor represented from 65 to 80% of the total receptor content. At 8 h following dosing, less than 30% of the total amount of receptor was associated with the nuclear fraction; this percentage declined slowly to less than 5% of the total at Day 35. The half-life for the decline in detectable nuclear receptor levels was 13 days and was similar to the half-life for the decline in [3H]TCDD content of the whole liver, cytosol, and nuclear extract. The Ah receptor contained in hamster hepatic cytosol underwent a ligand-dependent transformation in vitro to two forms having affinity for DNA-Sepharose, one of which was isolated from nuclei of animals treated with [3H]TCDD in vivo. A comparison of the specific binding recovered following various analytical procedures revealed that the binding of [3]TCDD to the form not found in nuclear extracts was more labile under certain experimental conditions. These studies indicate the heterogeneity of the Ah receptor in hamster hepatic cytosol and suggest that DNA binding in vitro and nuclear uptake in vivo occur through a liganddependent transformation process. The maintenance of maximal hepatic enzyme induction is, in part, a consequence of the sustained presence in the nucleus of only a small percentage of the total receptor content. The whole-tissue kinetics of TCDD appears to be a major factor regulating the long-term retention of the TCDD-receptor complex in the nucleus." @default.
• W2060697948 created "2016-06-24" @default.
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• W2060697948 date "1988-08-01" @default.
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• W2060697948 title "In vivo kinetics and DNA-binding properties of the Ah receptor in the golden syrian hamster" @default.
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• W2060697948 doi "https://doi.org/10.1016/0003-9861(88)90385-2" @default.
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