title: Discovery of sulfated sterols from marine invertebrates as a new class of marine natural antagonists of farnesoid-X-receptor.
abstract: We report the biochemical characterization of sulfated polyhydroxysterols isolated from marine invertebrates as potent antagonists of farnesoid-X-receptor (FXR), a ligand-regulated transcription factor involved in the regulation of lipid and glucose homeostasis in mammals. Molecular characterization of a library of sulfated polyhydroxysteroids resulted in the identification of a first FXR antagonist. In contrast to partial antagonists, this compound was endowed with an antagonistic activity on the expression of a subset of FXR-regulated genes in liver cells and abrogated the release of nuclear coreceptor from the promoter of these genes. The putative binding mode to FXR, obtained through docking calculations, suggested the crucial role played by the bent shape of the molecule as well as the presence of one hydroxyl group in its side chain. This compound is a major tool to explore the effect of FXR inhibition in pharmacological settings.
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Università di Napoli Federico II, via D Montesano 49, 80131 Napoli, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Sepe
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bifulco
authors.forename: Barbara
authors.initials: B
authors.lastname: Renga
authors.forename: Claudio
authors.initials: C
authors.lastname: D'Amore
authors.forename: Stefano
authors.initials: S
authors.lastname: Fiorucci
authors.forename: Angela
authors.initials: A
authors.lastname: Zampella
mesh_terms: D000818:Animals; D001665:Binding Sites; D004447:Echinodermata / Q000737:chemistry*; D056945:Hep G2 Cells; D006801:Humans; D006914:Hydroxysteroids / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D008958:Models, Molecular; D008968:Molecular Conformation; D018160:Receptors, Cytoplasmic and Nuclear / Q000037:antagonists & inhibitors*; D013261:Sterols / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013463:Sulfuric Acid Esters / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D014157:Transcription Factors / Q000037:antagonists & inhibitors*; D000099150:Receptor, Farnesoid X-Activated
chemical_list: D006914:Hydroxysteroids; D018160:Receptors, Cytoplasmic and Nuclear; D013261:Sterols; D013463:Sulfuric Acid Esters; D014157:Transcription Factors; D000099150:Receptor, Farnesoid X-Activated