title: Metabolism and time-course excretion of murideoxycholic acid, a 6 beta-hydroxylated bile acid, in humans.
abstract: The metabolism and time-courses of urinary and fecal excretions of murideoxycholic acid (MDCA; 3 alpha,6 beta-dihydroxy-5 beta-cholanoic acid), a 6 beta-hydroxylated bile acid, was investigated in man. The study was carried out in two groups of subjects. Six cholecystectomized patients fitted with a cystic duct drain ingested 100 mg of a tracer dose of 3H-MDCA. Time-course of radioactivity in plasma was then followed for an 8-h period. Biliary, urinary and fecal excretions of radioactivity were measured for a 5-day period and excreted MDCA metabolites were identified. Five lithiasic patients with intact enterohepatic circulation ingested 500 mg of the same tracer dose of 3H-MDCA. Radioactivity in plasma was followed for a 49-h period and urinary and fecal excretions of radioactivity were measured daily for 7 days. In the first group, the excretion of the radioactivity by the three routes (bile+urine+feces) reached 97.8 +/- 1.5% of the ingested dose but dropped to 75 +/- 8.3% (urine+feces) in patients in the second group. In cholecystectomized patients, the estimation of intestinal MDCA absorption was dependent on cystic duct drain flow rate and gave values ranging from 20% to 87%. The biological half-life of MDCA in lithiasic patients averaged 3.4 +/- 0.7 days. Radioactivity appeared in the plasma in the first hour and reached a maximum 6 and 3 h after the beginning of the experiment in group I and II respectively. In the second group, another peak of radioactivity in plasma was observed just after breakfast.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Laboratoire de Physiologie de la Nutrition, CNRS URA-646, Université Paris-Sud, Orsay, France.
authors.forename: J
authors.initials: J
authors.lastname: Khallou
authors.forename: V
authors.initials: V
authors.lastname: Legrand-Defretin
authors.forename: M
authors.initials: M
authors.lastname: Parquet
authors.forename: T
authors.initials: T
authors.lastname: Coste
authors.forename: J
authors.initials: J
authors.lastname: Rautureau
authors.forename: C
authors.initials: C
authors.lastname: Lutton
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001646:Bile / Q000378:metabolism; D001711:Biotransformation / Q000502:physiology; D002763:Cholecystectomy; D002769:Cholelithiasis / Q000188:drug therapy / Q000378:metabolism*; D003840:Deoxycholic Acid / Q000378:metabolism* / Q000652:urine; D005243:Feces / Q000737:chemistry; D005260:Female; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D014316:Tritium
chemical_list: D003840:Deoxycholic Acid; D014316:Tritium; C010471:hyodeoxycholic acid