title: Triterpenoid constituents isolated from the bark of Abies sachalinensis.
abstract: Three new lanostane-type triterpenoids (1-3) were isolated from the bark of Abies sachalinensis along with a known compound (4). The structures of 1-4 were characterized by spectroscopic methods including NMR and MS. Compound 4 and some derivatives were tested for inhibitory effects on in vitro DNA topoisomerases I and II and found to be selective catalytic inhibitors of topoisomerase II activity with IC(50) values in the range 43-76 microM.
authors.affiliation: Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan. wada@gly.oups.ac.jp
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Wada
authors.forename: Akira
authors.initials: A
authors.lastname: Iida
authors.forename: Reiko
authors.initials: R
authors.lastname: Tanaka
mesh_terms: D028202:Abies / Q000737:chemistry*; D002384:Catalysis; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D020128:Inhibitory Concentration 50; D007564:Japan; D007810:Lanosterol / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D013058:Mass Spectrometry; D008745:Methylation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010084:Oxidation-Reduction; D024301:Plant Bark / Q000737:chemistry; D013237:Stereoisomerism; D059004:Topoisomerase I Inhibitors; D059005:Topoisomerase II Inhibitors; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: C471667:3,4-seco-17,14-friedo-9H-lanosta-4(28),6,8(14)-trien-26,23-olid-3-oic acid; C471668:3-oxolanosta-9betaH-7-en-24S,25-diol; D004791:Enzyme Inhibitors; D059004:Topoisomerase I Inhibitors; D059005:Topoisomerase II Inhibitors; D014315:Triterpenes; C471666:methyl-3,4-seco-9H-lanosta-4(28),7-dien-26,23-olid-3-oate; D007810:Lanosterol