title: Bile is an important route of elimination of ingested aluminum by conscious male Sprague-Dawley rats.
abstract: We assessed the importance of bile as an excretory route for ingested aluminum (AI). Bile dusts in 30 male Sprague-Dawley rats were cannulated to allow both bile collection and reinfusion of bile acids. Five days after surgery, rats (average weight = 191 +/- 4 g) were given a single oral dose of aluminum (0, 0.2, 0.4, or 0.8 mmol) as aluminum lactate in 1 ml of 16% citrate by gavage. Bile was collected 1-7 h after dosing from unanesthetized rats. Biliary aluminum secretion was highest during the first hour of bile collection. All rats dosed with aluminum secreted significantly greater amounts of aluminum in bile than control rats. However, biliary aluminum secretion did not vary among animals given the different aluminum doses suggesting that biliary secretion of aluminum was saturated at these doses. Rats dosed with 0.8 mmol A1 retained significantly greater amounts of aluminum in soft tissues than those given 0.2 or 0.4 mmol A1. This result suggests that physiological were unable to prevent tissue aluminum accumulation in the rats given the highest dose.
authors.affiliation: Environmental Toxicology Center, University of Wisconsin-Madison 53706, USA.
authors.forename: J E
authors.initials: JE
authors.lastname: Sutherland
authors.forename: G M
authors.initials: GM
authors.lastname: Radzanowski
authors.forename: J L
authors.initials: JL
authors.lastname: Greger
mesh_terms: D000284:Administration, Oral; D000535:Aluminum / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D000818:Animals; D001646:Bile / Q000737:chemistry / Q000378:metabolism*; D001647:Bile Acids and Salts / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012044:Regression Analysis; D014018:Tissue Distribution
chemical_list: D001647:Bile Acids and Salts; D000535:Aluminum