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N-ethyl-tauroursodeoxycholic acid, a novel deconjugation-resistant bile salt analogue: effects of acute feeding in the rat.

Abstract
The purpose of this study was to investigate the physicochemical/biological properties and the effects of acute administration of N-ethyl-tauroursodeoxycholic acid in bile-fistula rats. In vitro determination of high-performance liquid chromatography mobility, octanol/ water partitioning, cholesterol solubilizing capacity, and sensitivity to enzyme deconjugation by bacteria and cholylglycine-hydroxylase were performed. In vivo determination of the following was also performed: (1) maximum secretory rate (SRmax) and choleretic/secretory properties during intravenous (IV) administration; (2) site/ extent of absorption, effects on bile flow, lipid secretion, and biotransformations after intraduodenal infusion. N-ethyl-tauroursodeoxycholate has a lipophilicity slightly higher than tauroursodeoxycholate, close to taurocholate, and similar cholesterol solubilizing capacity. Deconjugation of N-ethyl-tauroursodeoxycholate was 3.4 +/- 2.1% after 72 hours, that of tauroursodeoxycholate was 100% after 24 hours. During IV infusion of 300 nmol/min/ 100g, biliary secretion of N-ethyl-tauroursodeoxycholic and tauroursodeoxycholic acids averaged 185 +/- 76 (standard deviation) nmol/min/100 g and 221 +/- 77 nmol/min/ 100 g (not significant). Increasing infusion rates caused progressive enhancement of bile flow and bile salt secretion until the SRmax was reached (1,305 +/- 240 nmol/min/ 100 g for N-ethyl-tauroursodeoxycholic acid and 3,240 nmol/min/100 g for tauroursodeoxycholate). The two bile salts were similarly choleretic. IV feeding of N-ethyl-tauroursodeoxycholic promoted a greater lipid secretion than tauroursodeoxycholate. After intraduodenal feeding of 800 mumol, 38.8 +/- 14.0% and 43.4 +/- 12.4% of the two bile salts were recovered in bile. No unconjugated bile salts nor unusual metabolites were detected.(ABSTRACT TRUNCATED AT 250 WORDS)
AuthorsM Angelico, A Mangiameli, A Nistri, L Baiocchi, M Sofia, M Maina, M Di Martino, A Blasi
JournalHepatology (Baltimore, Md.) (Hepatology) Vol. 22 Issue 3 Pg. 887-95 (Sep 1995) ISSN: 0270-9139 [Print] United States
PMID7657297 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Bile Acids and Salts
  • N-ethyltauroursodeoxycholic acid
  • Taurochenodeoxycholic Acid
  • ursodoxicoltaurine
Topics
  • Animals
  • Bile (metabolism)
  • Bile Acids and Salts (chemistry, pharmacology)
  • Chemical Phenomena
  • Chemistry, Physical
  • Duodenum
  • Infusions, Intravenous
  • Injections
  • Male
  • Rats
  • Rats, Wistar
  • Taurochenodeoxycholic Acid (analogs & derivatives, chemistry, metabolism, pharmacology)

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