title: Cytochromes 1A1/1B1- and catechol-O-methyltransferase-derived metabolites mediate estradiol-induced antimitogenesis in human cardiac fibroblast.
abstract: We investigated the role of specific cytochrome P450s (CYP450s) and catechol-O-methyltransferase (COMT) in the growth inhibitory effects of estradiol in cardiac fibroblasts (CFs) expressing functional estrogen receptors. 3-Methylcholantherene, phenobarbital (broad-spectrum CYP450 inducers), and beta-naphthoflavone (CYP1A1/1A2 inducer) augmented, and 1-aminobenzotriazole (broad-spectrum CYP450 inhibitor) blocked, the inhibitory effects of estradiol on serum-induced CF growth (DNA synthesis, cell number, and collagen synthesis). Neither ketoconazole (3A4 inhibitor) nor furafylline (selective 1A2 inhibitor) altered the antimitogenic effects of estradiol on CF growth. In contrast, ellipticine (selective 1A1 inhibitor), pyrene (selective 1B1 inhibitor), and alpha-naphthoflavone (1A1>1A2 inhibitor) abrogated the antimitogenic effects of estradiol on CF growth. OR486 (COMT inhibitor) also blocked the antimitogenic effects of estradiol in both the presence and absence of the CYP450 inducers. ICI182780 (estrogen receptor antagonist) attenuated the growth inhibitory effects of estradiol, but only at concentrations that inhibit the metabolism of estradiol to hydroxyestradiols (precursors of methoxyestradiols). CFs expressed CYP1A1 and CYP1B1, isozymes that convert estradiol to hydroxyestradiols. Moreover, CFs metabolized estradiol to hydroxyestradiol, and 2-hydroxyestradiol to 2-methoxyestradiol. OR486 and quercetin (COMT inhibitor) blocked the conversion of 2-hydroxyestradiol to 2-methoxyestradiol in CFs. We conclude that the antimitogenic effects of estradiol on CF growth are mediated in part by conversion to hydroxyestradiols via CYP1A1 and CYP1B1, followed by metabolism of hydroxyestradiols to methoxyestradiols by COMT.
authors.affiliation: Department of Obstetrics and Gynecology, Clinic for Endocrinology, D217, NORD-1, Frauenklinik, University Hospital Zurich, CH-8091 Zurich, Switzerland. raghvendra.dubey@usz.ch
authors.forename: Raghvendra K
authors.initials: RK
authors.lastname: Dubey
authors.forename: Edwin K
authors.initials: EK
authors.lastname: Jackson
authors.forename: Delbert G
authors.initials: DG
authors.lastname: Gillespie
authors.forename: Marinella
authors.initials: M
authors.lastname: Rosselli
authors.forename: Federica
authors.initials: F
authors.lastname: Barchiesi
authors.forename: Andree
authors.initials: A
authors.lastname: Krust
authors.forename: Hansjoerg
authors.initials: H
authors.lastname: Keller
authors.forename: Lefteris C
authors.initials: LC
authors.lastname: Zacharia
authors.forename: Bruno
authors.initials: B
authors.lastname: Imthurn
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases / Q000502:physiology*; D002394:Catechol O-Methyltransferase / Q000502:physiology*; D002455:Cell Division / Q000187:drug effects*; D002478:Cells, Cultured; D019363:Cytochrome P-450 CYP1A1 / Q000502:physiology*; D065633:Cytochrome P-450 CYP1B1; D004958:Estradiol / Q000031:analogs & derivatives* / Q000378:metabolism* / Q000494:pharmacology; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D000077267:Fulvestrant; D006801:Humans; D006900:Hydroxylation; D009206:Myocardium / Q000166:cytology / Q000378:metabolism; D011960:Receptors, Estrogen / Q000502:physiology
chemical_list: D011960:Receptors, Estrogen; D000077267:Fulvestrant; D004958:Estradiol; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; D019363:Cytochrome P-450 CYP1A1; D065633:Cytochrome P-450 CYP1B1; D002394:Catechol O-Methyltransferase