title: Structure-activity relationship of bile alcohols as human farnesoid X receptor agonist.
abstract: FXR (farnesoid X receptor) is a bile acid-activated nuclear receptor that regulates not only the biosynthesis and enterohepatic circulation of bile acids, but also triglyceride, cholesterol and glucose metabolism. FXR-mediated signaling pathways have become promising novel drug targets for the treatment of common metabolic and hepatic diseases. With the aim of uncovering novel modulators of FXR and further elucidating the molecular basis of FXR activation, we investigated the structure-activity relationships of a variety of naturally occurring sterols structurally related to bile acids in terms of their FXR agonist activity. Here, we report that the ability of bile alcohols to activate FXR varied with the position and number of hydroxyl groups existing in the steroid side chain of bile alcohols. In addition, we showed that the shortening of the steroid side chain of bile acids as well as bile alcohols resulted in a decline of the ability of these agents to activate FXR. Thus, we provide new insights into the structure-activity relationships of bile acids and bile alcohols as FXR agonists.
authors.affiliation: Laboratory of Organic and Bio-molecular Chemistry, Faculty of Pharmaceutical Science, Hiroshima International University, 5-1-1, Hirokoshingai, Kure, Hiroshima 737-0112, Japan. y-iguchi@ps.hirokoku-u.ac.jp
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Iguchi
authors.forename: Kenji
authors.initials: K
authors.lastname: Kihira
authors.forename: Tomoko
authors.initials: T
authors.lastname: Nishimaki-Mogami
authors.forename: Mizuho
authors.initials: M
authors.lastname: Une
mesh_terms: D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters / Q000235:genetics; D045744:Cell Line, Tumor; D002777:Cholestanols / Q000737:chemistry* / Q000494:pharmacology*; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D015394:Molecular Structure; D018160:Receptors, Cytoplasmic and Nuclear / Q000819:agonists* / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013329:Structure-Activity Relationship; D014162:Transfection; D000099150:Receptor, Farnesoid X-Activated
chemical_list: D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters; D002777:Cholestanols; D008156:Luciferases; D018160:Receptors, Cytoplasmic and Nuclear; D000099150:Receptor, Farnesoid X-Activated; C093491:ABCB11 protein, human; C099713:nuclear receptor subfamily 0, group B, member 2