title: Isolation, DNA topoisomerase-II inhibition, and cytotoxicity of three new terpenoids from the bark of Macaranga tanarius.
abstract: One new pimarane-type diterpenoid (1) and two new taraxerane-based triterpenoids (2 and 3) were isolated from the bark of Macaranga tanarius, along with seven known compounds. Their structures were identified by spectroscopic methods including NMR and MS analyses. Compounds 1-5 were tested for their in vitro inhibition of DNA topoisomerase II, as well as for their cytotoxicities against human lung carcinoma A549 cells (Table 3). The triterpenoids 2-5 showed strong activities in both assays, but the diterpenoid 1 was only moderately active.
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: Reiko
authors.initials: R
authors.lastname: Tanaka
mesh_terms: D045744:Cell Line, Tumor; D003603:Cytotoxins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004250:DNA Topoisomerases, Type II / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D019665:Euphorbiaceae; D006801:Humans; D024301:Plant Bark; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D059005:Topoisomerase II Inhibitors
chemical_list: D003603:Cytotoxins; D004791:Enzyme Inhibitors; D010936:Plant Extracts; D013729:Terpenes; D059005:Topoisomerase II Inhibitors; D004250:DNA Topoisomerases, Type II