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A single dose of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 2,3,7-tribromodibenzo-p-dioxin (2,3,7-TBDD), 1,2,3,7,8,9-hexachlorodibenzo-p-dioxin (1,2,3,7,8,9-HCDD), 1,2,4,6,7,9-hexachlorodibenzo-p-dioxin (1,2,4,6,7,9-HCDD), or 1,3,6,8-tetrachlorodibenzo-p-dioxin (1,3,6,8-TCDD) was given to male rats (25 micrograms/kg, p.o.) and plasma concentration and biliary excretion of ouabain assessed 10 days later. Treatment of TCDD, 2,3,7-TBDD and to a lesser extent 1,2,3,7,8,9-HCDD increased the plasma concentration of ouabain and decreased its excretion into ouabain. TCDD, 2,3,7-TBDD and to a lesser extent, 1,2,3,7,8,9-HCDD decreased the bile flow. Liver wet weight was increased in TCDD and 2,3,7-TBDD treated rats. The magnitude of depression in ouabain excretion by those compounds was closely related to the reported relative binding affinity of the compound to liver cytosol and their induction potency of aryl hydrocarbon hydroxylase activity.
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