title: Absorption, distribution, metabolism and excretion (ADME) study with 2,2',4,4',5,6'-hexabromodiphenyl ether (BDE-154) in male Sprague-Dawley rats.
abstract: A metabolism study of orally administered 2,2',4,4',5,6'-hexabromodiphenyl ether (BDE-154; 11.3 micromoles kg(-1)) was conducted in conventional and bile duct-cannulated male Sprague-Dawley rats. In conventional rats, approximately 31% of the radiolabelled dose was retained at 72 h, and lipophilic tissues were the preferred sites for disposition. Urinary excretion of BDE-154 was very low (1.0%), and parent compound was detected. Cumulative biliary excretion was 1.3%, and glutathione conjugates were suggested. Over 62% of the dose in conventional male rats was excreted in faeces, and was composed of parent compound (7.3%), free metabolites (13.1%), and covalently bound residues (41.4%). Faecal metabolites characterized by gas chromatography/mass spectrometry included multiple isomers of monohydroxylated hexa-/penta-/tetrabromodiphenyl ethers, and di-hydroxylated hexa/pentabromodiphenyl ethers. The adipose tissue 14C was extractable BDE-154, but 40% of liver 14C was bound to macromolecules. The study demonstrated the importance of performing individual polybrominated diphenyl ether (PBDE) metabolism studies to understand fully PBDE pharmacokinetics.
authors.affiliation: Biosciences Research Laboratory, ARS, USDA, Fargo, ND 58105, USA. heldur.hakk@ars.usda.gov
authors.forename: H
authors.initials: H
authors.lastname: Hakk
authors.forename: J K
authors.initials: JK
authors.lastname: Huwe
authors.forename: G L
authors.initials: GL
authors.lastname: Larsen
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000284:Administration, Oral; D000818:Animals; D001646:Bile / Q000378:metabolism; D005243:Feces / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D007408:Intestinal Absorption; D008297:Male; D053858:Metabolic Networks and Pathways / Q000502:physiology; D011075:Polybrominated Biphenyls / Q000737:chemistry / Q000493:pharmacokinetics* / Q000652:urine; D051381:Rats; D017207:Rats, Sprague-Dawley; D014018:Tissue Distribution / Q000502:physiology
chemical_list: D011075:Polybrominated Biphenyls; C533761:hexabromodiphenyl ether 154