title: Serum plant sterols and biliary cholesterol secretion in humans: studies with ursodeoxycholic acid.
abstract: Ratios of cholestanol, campesterol, and sitosterol to cholesterol in serum are known to reflect cholesterol absorption efficiency. Here, a possible link between these ratios and biliary secretion rates of cholesterol was investigated. Biliary lipid secretion rates and serum sterols were determined in 13 patients with gallstones. Seven were treated with ursodeoxycholic acid (UDCA) (1,000 mg/d). Serum cholesterol and non-cholesterol sterols were also measured in a cross over study in 20 healthy volunteers, who received either placebo or UDCA (750 mg/d). Biliary cholesterol secretion was significantly lower, whereas the non-cholesterol sterols and their ratio to cholesterol were higher in patients with gallstones treated with UDCA. A highly significant negative linear correlation between the ratios of non-cholesterol sterols to cholesterol and biliary cholesterol secretion was observed. In volunteers, administration of UDCA for 4 weeks was followed by a significant increase in non-cholesterol sterols and their ratios. Even 4 weeks after discontinuing UDCA administration, campesterol and sitosterol were still significantly higher than pretreatment levels, which was also true for the campesterol-cholesterol ratio after 8 weeks. The results suggest that the ratios of cholestanol, campesterol, and sitosterol to cholesterol can be used as indicators of changes in biliary cholesterol secretion rates.
authors.affiliation: Department of Clinical Pharmacology, University of Bonn, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Lindenthal
authors.forename: Thomas
authors.initials: T
authors.lastname: Sudhop
authors.forename: Peter
authors.initials: P
authors.lastname: Schiedermaier
authors.forename: Mohamed
authors.initials: M
authors.lastname: Agnan
authors.forename: Tilman
authors.initials: T
authors.lastname: Sauerbruch
authors.forename: Klaus
authors.initials: K
authors.lastname: von Bergmann
mesh_terms: D000328:Adult; D001646:Bile / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism*; D002756:Cholagogues and Choleretics / Q000494:pharmacology; D002784:Cholesterol / Q000031:analogs & derivatives* / Q000097:blood / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010840:Phytosterols / Q000097:blood*; D012855:Sitosterols / Q000097:blood; D014580:Ursodeoxycholic Acid / Q000494:pharmacology*
chemical_list: D002756:Cholagogues and Choleretics; D010840:Phytosterols; D012855:Sitosterols; C021273:campesterol; C025473:gamma-sitosterol; D014580:Ursodeoxycholic Acid; D002784:Cholesterol