title: Effect of chronic administration of tauro-hyodeoxycholic acid on biliary bile acid composition and on biliary lipid secretion in humans.
abstract: BACKGROUND
  Tauro-hyodeoxycholic acid is a hydrophilic bile acid of potential interest for treating cholestatic liver diseases. Bile acid pool is enriched with this bile acid during acute administration in patients with interrupted enterohepatic circulation. The aim of our study was to check the effect of chronic administration of tauro-hyodeoxycholic acid on biliary lipid composition and secretion in man with intact enterohepatic circulation.
  
  
  METHODS
  We studied 7 dyspeptic patients before and during taurohyodeoxycholic acid 750 mg/day given for 6-8 weeks. We measured bile acid composition in duodenal aspirate, and biliary lipid secretion was also measured in 5 of these patients using a duodenal perfusion technique.
  
  
  RESULTS
  Tauro-hyodeoxycholic was undetectable in duodenal aspirate in all patients before treatment, and was 2%, 4%, 5%, 7%, 7%, 8% and 13% of biliary bile acid during treatment in individual patients. The proportion of cholic, deoxycholic, chenodeoxycholic ursodeoxycholic and lithocholic acid was similar before and during treatment. Bile acid duodenal output remained unchanged during taurohyodeoxycholic by comparison with pretreatment with median difference -0.3 mmol (95% confidence interval 1.6 mmol). The corresponding difference for duodenal cholesterol and phospholipid output was 0.1 mmol (0.2 mmol) and 0.2 mmol (0.6 mmol).
  
  
  CONCLUSIONS
  By contrast with acute administration in patients with interrupted enterohepatic circulation, chronic administration of tauro-hyodeoxycholic to man with intact enterohepatic circulation has little effect on biliary lipid composition and secretion.
authors.affiliation: Medicine 1. Spedali Civili and Medical School, Brescia, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Lanzarotto
authors.forename: S
authors.initials: S
authors.lastname: Sosta
authors.forename: A
authors.initials: A
authors.lastname: Lanzini
mesh_terms: D000328:Adult; D001646:Bile / Q000737:chemistry / Q000187:drug effects*; D001647:Bile Acids and Salts / Q000032:analysis*; D002756:Cholagogues and Choleretics / Q000008:administration & dosage / Q000627:therapeutic use*; D004334:Drug Administration Schedule; D004415:Dyspepsia / Q000188:drug therapy* / Q000378:metabolism; D004764:Enterohepatic Circulation; D005260:Female; D006801:Humans; D008055:Lipids / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D013657:Taurodeoxycholic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000627:therapeutic use*
chemical_list: D001647:Bile Acids and Salts; D002756:Cholagogues and Choleretics; D008055:Lipids; C083510:taurohyodeoxycholic acid; D013657:Taurodeoxycholic Acid