title: Antagonistic action of novel 1alpha,25-dihydroxyvitamin D3-26, 23-lactone analogs on differentiation of human leukemia cells (HL-60) induced by 1alpha,25-dihydroxyvitamin D3.
abstract: We examined the effects of two novel 1alpha,25-dihydroxyvitamin D3-26,23-lactone (1alpha,25-lactone) analogues on human promyelocytic leukemia cell (HL-60) differentiation using the evaluation system of the vitamin D nuclear receptor (VDR)/vitamin D-responsive element (DRE)-mediated genomic action stimulated by 1alpha,25-dihydroxyvitamin D3 (1alpha,25(OH)2D3) and its analogues. We found that the 1alpha,25-lactone analogues (23S)-25-dehydro-1alpha-hydroxyvitamin-D3-26,23-lactone (TEI-9647), and (23R)-25-dehydro-1alpha-hydroxyvitamin-D3-26,23-lactone (TEI-9648) bound much more strongly to the VDR than the natural (23S, 25R)-1alpha,25(OH)2D3-26,23-lactone, but did not induce cell differentiation even at high concentrations (10(-6) M). Intriguingly, the differentiation of HL-60 cells induced by 1alpha,25(OH)2D3 was inhibited by either TEI-9647 or TEI-9648 but not by the natural lactone. In contrast, retinoic acid or 12-O-tetradecanoylphorbol-13-acetate-induced HL-60 cell differentiation was not blocked by TEI-9647 or TEI-9648. In separate studies, TEI-9647 (10(-7) M) was found to be an effective antagonist of both 1alpha,25(OH)2D3 (10(-8) M) mediated induction of p21(WAF1, CIP1) in HL-60 cells and activation of the luciferase reporter assay in COS-7 cells transfected with cDNA containing the DRE of the rat 25(OH)D3-24-hydroxylase gene and cDNA of the human VDR. Collectively the results strongly suggest that our novel 1alpha,25-lactone analogues, TEI-9647 and TEI-9648, are specific antagonists of 1alpha, 25(OH)2D3 action, specifically VDR/DRE-mediated genomic action. As such, they represent the first examples of antagonists, which act on the nuclear VDR.
authors.affiliation: Safety Research Department, Teijin Institute for Bio-Medical Research, 4-3-2 Asahigaoka, Hino, Tokyo 191-8512, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Miura
authors.forename: K
authors.initials: K
authors.lastname: Manabe
authors.forename: K
authors.initials: K
authors.lastname: Ozono
authors.forename: M
authors.initials: M
authors.lastname: Saito
authors.forename: Q
authors.initials: Q
authors.lastname: Gao
authors.forename: A W
authors.initials: AW
authors.lastname: Norman
authors.forename: S
authors.initials: S
authors.lastname: Ishizuka
mesh_terms: D000818:Animals; D019556:COS Cells; D002117:Calcitriol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects*; D002467:Cell Nucleus / Q000378:metabolism; D002762:Cholecalciferol / Q000031:analogs & derivatives; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000235:genetics / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System; D017930:Genes, Reporter; D018922:HL-60 Cells; D006801:Humans; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008956:Models, Chemical; D051381:Rats; D018167:Receptors, Calcitriol / Q000235:genetics / Q000378:metabolism; D013250:Steroid Hydroxylases / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D065668:Vitamin D3 24-Hydroxylase
chemical_list: C493956:CDKN1A protein, human; C493958:Cdkn1a protein, rat; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D018167:Receptors, Calcitriol; D002762:Cholecalciferol; C026947:1,25-dihydroxyvitamin D3-26,23-lactone; D003577:Cytochrome P-450 Enzyme System; D008156:Luciferases; D013250:Steroid Hydroxylases; D065668:Vitamin D3 24-Hydroxylase; D002117:Calcitriol