title: Bile Acid Metabolome after an Oral Lipid Tolerance Test by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).
abstract: BACKGROUND
  Besides their role in intestinal resorption of lipids, bile acids are regarded as endocrine and metabolic signaling molecules. The detailed profile of bile acid species in peripheral blood after an oral lipid tolerance test (OLTT) is unknown.
  
  
  OBJECTIVE
  We quantified the regulation of 18 bile acids after OLTT in healthy individuals.
  
  
  METHODS
  100 volunteers were characterized by anthropometric and laboratory parameters and underwent OLTT. Venous blood was drawn in the fasted state (0 h) and at 2h, 4h, and 6 h after OLTT. Serum concentrations of 18 bile acids were measured by LC-MS/MS.
  
  
  RESULTS
  All of the 6 taurine-conjugated bile acids (TUDCA, THDCA, TCA, TCDCA, TDCA, TLCA) and all of the 6 glycine-conjugated bile acids (GUDCA, GHDCA, GCA, GCDCA, GDCA, GLCA) rose significantly at 2h and remained elevated during OLTT. Of the primary bile acids, CA remained unchanged, whereas CDCA significantly decreased at 4h. Of the secondary bile acids, DCA, UDCA and HDCA were not altered, whereas LCA decreased. There was a significant positive correlation between the intestinal feed-back regulator of bile acid synthesis FGF-19 and bile acids. This correlation seems to depend on all of the six taurine-conjugated bile acids and on GCA, GDCA, and GCDCA. Females and users of hormonal contraception displayed higher levels of taurine-conjugated bile acids.
  
  
  CONCLUSIONS
  The novelty of the study is based on the identification of single bile acids during OLTT. LC-MS/MS-based quantification of bile acids in serum provides a reliable tool for future investigation of endocrine and metabolic effects of bile acids.
authors: Department of Internal Medicine III, Giessen University Hospital, Giessen, Germany.
authors: Andreas
authors: A
authors: Schmid
authors: Department of Internal Medicine III, Giessen University Hospital, Giessen, Germany.
authors: Hannah
authors: H
authors: Neumann
authors: Department of Internal Medicine III, Giessen University Hospital, Giessen, Germany.
authors: Thomas
authors: T
authors: Karrasch
authors: Institute of Clinical Chemistry and Laboratory Medicine, Regensburg University Hospital, Regensburg, Germany.
authors: Gerhard
authors: G
authors: Liebisch
authors: Department of Internal Medicine III, Giessen University Hospital, Giessen, Germany.
authors: Andreas
authors: A
authors: Schäffler
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D001647:Bile Acids and Salts / Q000097:blood* / Q000737:chemistry; D002853:Chromatography, Liquid / Q000379:methods*; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology; D004041:Dietary Fats / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005346:Fibroblast Growth Factors / Q000502:physiology; D005998:Glycine / Q000032:analysis; D006801:Humans; D008297:Male; D055442:Metabolome / Q000187:drug effects; D008875:Middle Aged; D009765:Obesity / Q000097:blood; D010938:Plant Oils / Q000008:administration & dosage / Q000494:pharmacology; D019518:Postprandial Period; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013654:Taurine / Q000032:analysis; D014280:Triglycerides / Q000008:administration & dosage / Q000494:pharmacology
chemical_list: D001647:Bile Acids and Salts; D003278:Contraceptives, Oral, Hormonal; D004041:Dietary Fats; C117476:FGF19 protein, human; D010938:Plant Oils; D014280:Triglycerides; C414620:fibroblast growth factor 21; D013654:Taurine; D005346:Fibroblast Growth Factors; D005998:Glycine