Metabolism of 24-norlithocholic acid in the rat: formation of hydroxyl- and carboxyl-linked glucuronides and effect on bile flow

Hepatology. 1986 Sep-Oct;6(5):869-73. doi: 10.1002/hep.1840060511.

Abstract

24-Norlithocholic (3 alpha-hydroxy-24-nor-5 beta-cholan-23-oic) acid is the lower homologue of lithocholic acid, a potent cholestatic agent. In order to characterize its cholestatic potential and metabolic fate, 3 beta-tritiated 24-norlithocholate was infused intravenously into adult male Sprague-Dawley rats prepared with an external biliary fistula. The results demonstrate that 24-norlithocholate does not induce cholestasis in rats when administered in doses in excess of those necessary for lithocholate to produce cholestasis. Hydroxyl- and carboxyl-linked glucuronides were identified as major metabolites secreted in the bile. Especially noteworthy is the identification of carboxyl-linked glucuronides of mono-, di- and trihydroxylated C23 bile acids. Their total amount (25% of recovered radioactive products) is comparable to that of the hydroxyl-linked glucuronide of 24-norlithocholic acid (41%). In this study, for the first time, a bile acid diglucuronide, substituted both at 3-hydroxyl and carboxyl groups, was detected (11%).

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Bile / metabolism*
  • Glucuronates / metabolism*
  • Infusions, Intravenous
  • Lithocholic Acid / analogs & derivatives*
  • Lithocholic Acid / metabolism
  • Magnetic Resonance Spectroscopy
  • Male
  • Rats
  • Rats, Inbred Strains
  • Scintillation Counting
  • Spectrum Analysis

Substances

  • Glucuronates
  • 24-norlithocholic acid
  • Lithocholic Acid