title: Synthesis of 1alpha,25-dihydroxyvitamin D3-26,23-lactams (DLAMs), a novel series of 1 alpha,25-dihydroxyvitamin D3 antagonist.
abstract: Novel vitamin D(3) analogs having a lactam structure in their side chains, 1 alpha,25-dihydroxyvitamin D(3)-26,23-lactams (DLAMs), were designed based on the principle of regulation of the folding of helix-12 in the vitamin D nuclear receptor (VDR). The new analogs were synthesized via 1,3-dipolar cycloaddition reaction and subsequent reduction of the isoxazolidine as key steps. Among the analogs, (23S,25S)-DLAM-01 (4a) and (23S,25S)-DLAM-1P (5a) bind strongly to VDR. Moreover, these analogs were found to inhibit the differentiation of HL-60 cells induced by 1 alpha,25-dihydroxyvitamin D(3).
authors.affiliation: Institute of Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kato
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakano
authors.forename: Hiroko
authors.initials: H
authors.lastname: Sano
authors.forename: Aya
authors.initials: A
authors.lastname: Tanatani
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Rumiko
authors.initials: R
authors.lastname: Shimazawa
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Koshino
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: Kazuo
authors.initials: K
authors.lastname: Nagasawa
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D015195:Drug Design; D018922:HL-60 Cells; D006801:Humans; D020128:Inhibitory Concentration 50; D007769:Lactams / Q000138:chemical synthesis* / Q000494:pharmacology; D011485:Protein Binding; D018167:Receptors, Calcitriol / Q000737:chemistry / Q000187:drug effects*; D013329:Structure-Activity Relationship; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000138:chemical synthesis
chemical_list: D007769:Lactams; D018167:Receptors, Calcitriol; C118756:dihydroxy-vitamin D3; D014807:Vitamin D