title: Biliary cefpiramide excretion: its relation to biliary excretion of bile acids and sulfobromophthalein.
abstract: Cefpiramide, a beta-lactam antibiotic, has been reported to be excreted from hepatocytes into the bile by a carrier-mediated system. Herein, the relationship of biliary cefpiramide excretion to the excretion of bile acids and sulfobromophthalein was studied in rats. Biliary cefpiramide excretion was markedly inhibited by sulfobromophthalein, lithocholate-3-O-glucuronide and taurolithocholate-3-sulfate, whereas it was not inhibited by ursodeoxycholate or taurocholate. However, the inhibitory effect of cefpiramide on the biliary excretion of sulfobromophthalein or lithocholate-3-sulfate was very small. These findings indicate that, although cefpiramide is excreted by a process common to organic anions and bile acid sulfate and glucuronide, two or more excretory pathways for organic anions exist and cefpiramide has affinity for only one of these carriers.
authors.affiliation: Department of Medicine, Teikyo University School of Medicine, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takikawa
authors.forename: Y
authors.initials: Y
authors.lastname: Uchida
authors.forename: N
authors.initials: N
authors.lastname: Sano
authors.forename: M
authors.initials: M
authors.lastname: Yamanaka
mesh_terms: D000818:Animals; D001646:Bile / Q000378:metabolism; D001647:Bile Acids and Salts / Q000378:metabolism*; D002511:Cephalosporins / Q000493:pharmacokinetics* / Q000494:pharmacology; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013448:Sulfobromophthalein / Q000493:pharmacokinetics*
chemical_list: D001647:Bile Acids and Salts; D002511:Cephalosporins; D013448:Sulfobromophthalein; C036666:cefpiramide