title: Cholestyramine-enhanced fecal elimination of carbon-14 in rats after administration of ammonium [14C]perfluorooctanoate or potassium [14C]perfluorooctanesulfonate.
abstract: After a single intravenous dose of ammonium [14C]perfluorooctanoate [( 14C]PFO, 13.3 mg/kg) or of potassium [14C]perfluorooctanesulfonate [( 14C]PFOS, 3.4 mg/kg) to rats, cholestyramine fed daily as a 4% mixture in feed was shown to increase the total carbon-14 eliminated via feces and to decrease liver concentration of carbon-14. Rats were fed cholestyramine in feed for 14 days after administration of [14C]PFO and for 21 days after administration of [14C]PFOS. Control rats were administered radiolabeled fluorochemical but were not treated with cholestyramine. Cholestyramine treatment increased mean cumulative carbon-14 elimination in feces by 9.8-fold for rats administered [14C]PFO and by 9.5-fold for rats administered [14C]PFOS. After [14C]PFO, a mean of 4% of the dose of carbon-14 was in liver of cholestyramine-treated rats at 14 days versus 7.6% in control rats; after [14C]PFOS, 11.3% of the dose was in liver at 21 days versus 40.3% in control rats. After administration of either radiolabeled compound, plasma and red blood cell carbon-14 concentrations, which were relatively lower than liver concentrations, were also significantly reduced by cholestyramine treatment.
mesh_terms: D000818:Animals; D002210:Caprylates / Q000008:administration & dosage* / Q000378:metabolism; D002250:Carbon Radioisotopes; D002792:Cholestyramine Resin / Q000494:pharmacology*; D004912:Erythrocytes / Q000378:metabolism; D005243:Feces / Q000032:analysis*; D005466:Fluorocarbons / Q000008:administration & dosage* / Q000378:metabolism; D007275:Injections, Intravenous; D008099:Liver / Q000378:metabolism; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
chemical_list: D002210:Caprylates; D002250:Carbon Radioisotopes; D005466:Fluorocarbons; D002792:Cholestyramine Resin; C023036:perfluorooctanoic acid