title: Morphologic changes in livers of hamsters treated with high doses of ursodeoxycholic acid: correlation with bile acids in bile.
abstract: The effects of high doses of ursodeoxycholic acid on bile acid composition and the liver morphology was examined in 60 male Syrian golden hamsters. The animals were allocated to five groups: I, control; II and IV received 0.5 g and 1 g of ursodeoxycholic acid per 100 g of standard diet respectively over 30 days and III and V received 0.5 g and 1 g of ursodeoxycholic acid per 100 g of standard diet respectively over 60 days. Bile acids were determined by high performance liquid chromatography. In all treated groups there was a significant increase in chenodeoxycholic and lithocholic acid in the bile. The mean glyco/tauro ratio was significantly higher than in the control group, reaching values > 1 for individual bile acids, except for lithocholic acid values which remained < 1. Under light microscopy, the livers of the hamsters showed damage which was dose/time related, namely portal inflammatory infiltrate, bile duct proliferation, cholestasis, fat infiltration and necrosis. Electron microscopy revealed pronounced changes starting with microvilli edema and extending to canalicular membrane destruction and necrosis. The changes observed in the relation glyco/tauro lithocholic acids, may be due to defence mechanisms to avoid hepatotoxicity. The hepatotoxicity resulting from ursodeoxycholic acid administration is presumed to be due primarily to lithocholic acid or some lithocholic acid metabolite.
authors.affiliation: Departamento Docencia e Investigación Hospital Aeronáutico Central, Capital Federal, Argentina.
authors.forename: A
authors.initials: A
authors.lastname: Mamianetti
authors.forename: H F
authors.initials: HF
authors.lastname: Konopka
authors.forename: N
authors.initials: N
authors.lastname: Lago
authors.forename: C
authors.initials: C
authors.lastname: Vescina
authors.forename: E
authors.initials: E
authors.lastname: Scarlato
authors.forename: C N
authors.initials: CN
authors.lastname: Carducci
mesh_terms: D000818:Animals; D001646:Bile / Q000187:drug effects / Q000378:metabolism*; D001647:Bile Acids and Salts / Q000378:metabolism*; D056486:Chemical and Drug Induced Liver Injury / Q000473:pathology*; D002851:Chromatography, High Pressure Liquid; D006224:Cricetinae; D005999:Glycochenodeoxycholic Acid / Q000378:metabolism; D008095:Lithocholic Acid / Q000031:analogs & derivatives / Q000378:metabolism; D008099:Liver / Q000473:pathology* / Q000648:ultrastructure; D008297:Male; D008647:Mesocricetus; D008854:Microscopy, Electron; D013656:Taurocholic Acid / Q000378:metabolism; D014580:Ursodeoxycholic Acid / Q000493:pharmacokinetics / Q000633:toxicity*
chemical_list: D001647:Bile Acids and Salts; D013656:Taurocholic Acid; D008095:Lithocholic Acid; D005999:Glycochenodeoxycholic Acid; D014580:Ursodeoxycholic Acid; C027746:glycolithocholic acid