title: The UDP-glucuronosyltransferase 1A9 enzyme is a peroxisome proliferator-activated receptor alpha and gamma target gene.
abstract: Peroxisome proliferator-activated receptor (PPAR) alpha and gamma are ligand-activated transcription factors belonging to the nuclear receptor family. PPAR alpha mediates the hypolipidemic action of the fibrates, whereas PPAR gamma is a receptor for the antidiabetic glitazones. In the present study, the UDP-glucuronosyltransferase (UGT) 1A9 enzyme is identified as a PPAR alpha and PPAR gamma target gene. UGTs catalyze the glucuronidation reaction, which is a major pathway in the catabolism and elimination of numerous endo- and xenobiotics. Among the UGT1A family enzymes, UGT1A9 metabolizes endogenous compounds, including catecholestrogens, and xenobiotics, such as fibrates and to a lesser extent troglitazone. Treatment of human hepatocytes and macrophages and murine adipocytes with activators of PPAR alpha or PPAR gamma resulted in an enhanced UGT1A9 expression and activity. In addition, disruption of the PPAR alpha gene in mice completely abolished the PPAR alpha agonist-induced UGT1A9 mRNA and activity levels. A PPAR response element was identified in the promoter of UGT1A9 at positions -719 to -706 bp by transient transfection and electromobility shift assays. Considering the role of UGT1A9 in catecholestrogen metabolism, PPAR alpha and PPAR gamma activation may contribute to the protection against genotoxic catecholestrogens by stimulating their inactivation in glucuronide derivatives. Furthermore, since UGT1A9 is involved in the catabolism of fibrates, these results suggest that PPAR alpha and PPAR gamma may control the intracellular level of active fibrates.
authors.affiliation: UR 545 INSERM, Département d'Athérosclérose, Institut Pasteur de Lille and the Faculté de Pharmacie, Université de Lille II, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Barbier
authors.forename: Lyne
authors.initials: L
authors.lastname: Villeneuve
authors.forename: Virginie
authors.initials: V
authors.lastname: Bocher
authors.forename: Coralie
authors.initials: C
authors.lastname: Fontaine
authors.forename: Ines Pineda
authors.initials: IP
authors.lastname: Torra
authors.forename: Christian
authors.initials: C
authors.lastname: Duhem
authors.forename: Vladimir
authors.initials: V
authors.lastname: Kosykh
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Fruchart
authors.forename: Chantal
authors.initials: C
authors.lastname: Guillemette
authors.forename: Bart
authors.initials: B
authors.lastname: Staels
mesh_terms: D016475:3T3 Cells; D000256:Adenoviridae / Q000235:genetics; D017667:Adipocytes / Q000378:metabolism; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology; D002454:Cell Differentiation; D002460:Cell Line; D002478:Cells, Cultured; D002839:Chromans / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005966:Glucuronidase / Q000378:metabolism; D014453:Glucuronosyltransferase / Q000737:chemistry* / Q000502:physiology*; D022781:Hepatocytes / Q000378:metabolism; D006801:Humans; D008264:Macrophages / Q000378:metabolism; D051379:Mice; D008862:Microsomes, Liver / Q000378:metabolism; D016297:Mutagenesis, Site-Directed; D010957:Plasmids / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012313:RNA / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D020218:Response Elements; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013844:Thiazoles / Q000494:pharmacology; D045162:Thiazolidinediones; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection; D000077288:Troglitazone; D000090264:UDP-Glucuronosyltransferase 1A9; D015262:Xenobiotics / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D002839:Chromans; D012333:RNA, Messenger; D018160:Receptors, Cytoplasmic and Nuclear; D013844:Thiazoles; D045162:Thiazolidinediones; D014157:Transcription Factors; C000715591:UGT1A9 protein, human; C000715592:Ugt1a9 protein, mouse; D015262:Xenobiotics; D012313:RNA; D014453:Glucuronosyltransferase; D000090264:UDP-Glucuronosyltransferase 1A9; D005966:Glucuronidase; D000077288:Troglitazone