title: Induction of genes for metabolism and transport by trans-stilbene oxide in livers of Sprague-Dawley and Wistar-Kyoto rats.
abstract: trans-Stilbene oxide (TSO) is a synthetic proestrogen that induces phase I and II drug-metabolizing enzymes in rat liver. The purpose of this study was to determine whether TSO also induces transporter expression in rat liver and whether gene induction in rat liver after TSO occurs in a constitutive androstane receptor (CAR)-dependent manner. Total RNA was isolated from male rat livers after treatment with TSO for up to 4 days (200 mg/kg, i.p., twice daily), and the mRNA levels for each gene were quantified. CYP2B1/2, CYP3A1, epoxide hydrolase, heme oxygenase-1, UGT1A6, UGT2B1, multiple drug resistance protein (Mdr) 1a and 1b, as well as multidrug resistance-associated protein (Mrp) 2, 3, and 4 mRNA were increased in livers after TSO treatment. To determine whether TSO activates gene expression in a CAR-dependent manner, male and female Wistar-Kyoto (WKY) rats were treated with TSO for 3 days. TSO induced CYP2B1/2, UGT2B1, and Mdr1b in males more than in females, suggesting that TSO could increase their expression via CAR. Conversely, TSO induced CYP3A1, epoxide hydrolase, UGT1A6, and Mrp3 similarly in both genders, indicating that induction of these genes occurs independently of CAR. TSO treatment also increased the activity of a CAR binding element luciferase reporter construct in HepG2 cells transfected with rat CAR and in mouse liver. Additionally, TSO increased antioxidant response element/electrophile response element luciferase reporter construct activity in HepG2 cells. In conclusion, in WKY rat liver, TSO increases CYP2B1/2, UGT2B1, and Mdr1b mRNA expression in a gender-dependent manner and CYP3A1, epoxide hydrolase, UGT1A6, and Mrp3 in a gender-independent manner.
authors.affiliation: Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS 66160-7417, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Slitt
authors.forename: N J
authors.initials: NJ
authors.lastname: Cherrington
authors.forename: C D
authors.initials: CD
authors.lastname: Fisher
authors.forename: M
authors.initials: M
authors.lastname: Negishi
authors.forename: C D
authors.initials: CD
authors.lastname: Klaassen
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000235:genetics / Q000378:metabolism; D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics / Q000378:metabolism; D045744:Cell Line, Tumor; D000090702:Constitutive Androstane Receptor; D019362:Cytochrome P-450 CYP2B1 / Q000235:genetics / Q000378:metabolism; D051544:Cytochrome P-450 CYP3A; D004851:Epoxide Hydrolases / Q000235:genetics / Q000378:metabolism; D005260:Female; D017930:Genes, Reporter; D014453:Glucuronosyltransferase / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D008156:Luciferases; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D011921:Rats, Inbred WKY; D017207:Rats, Sprague-Dawley; D018160:Receptors, Cytoplasmic and Nuclear / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D020218:Response Elements / Q000187:drug effects / Q000235:genetics; D012737:Sex Factors; D013267:Stilbenes / Q000494:pharmacology*; D014157:Transcription Factors / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D015854:Up-Regulation; D000097202:ATP-Binding Cassette Sub-Family B Member 4
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D001189:Aryl Hydrocarbon Hydroxylases; D000090702:Constitutive Androstane Receptor; D019362:Cytochrome P-450 CYP2B1; D051544:Cytochrome P-450 CYP3A; D004851:Epoxide Hydrolases; D014453:Glucuronosyltransferase; D008156:Luciferases; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D012333:RNA, Messenger; D018160:Receptors, Cytoplasmic and Nuclear; D013267:Stilbenes; D014157:Transcription Factors; D000097202:ATP-Binding Cassette Sub-Family B Member 4; C000715087:ABCC2 protein, human; C114462:multidrug resistance-associated protein 3; C465138:Cyp3a23-3a1 protein, rat; C025906:stilbene oxide