title: Multidrug-resistant cancer cell susceptibility to cytotoxic quassinoids, and cancer chemopreventive effects of quassinoids and canthin alkaloids.
abstract: Twenty-three quassinoids (1-23), which were isolated previously from Simaroubaceous plants, were evaluated for cytotoxicity against three multidrug-resistant cancer cell lines, KB-VIN, KB-7d, and KB-CPT. Nine compounds (2-7 and 9-11) showed significant cytotoxicity in all three cell lines. Compounds 1, 12-14, 17, and 20 demonstrated significant activity against the KB-7d and KB-CPT cell lines, and compounds 18, 19, and 23 revealed notable activity only against KB-7d cells. Structure-activity relationships were drawn based on these data. In addition, six quassinoid derivatives (24-29) and four canthin alkaloids (30-33), which were isolated from Brucea antidysenterica, were examined for their inhibitory effects on 12-O-tetradecanoylphorbol-13-acetate (TPA) induced Epstein-Barr virus early antigen (EBV-EA) activation as cancer chemopreventive agents. All of these compounds demonstrated significant inhibitory effects against EBV-EA activation.
authors.affiliation: Department of Interdisciplinary Studies of Natural Environment, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Murakami
authors.forename: Narihiko
authors.initials: N
authors.lastname: Fukamiya
authors.forename: Sadaaki
authors.initials: S
authors.lastname: Tamura
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Okano
authors.forename: Kenneth F
authors.initials: KF
authors.lastname: Bastow
authors.forename: Harukuni
authors.initials: H
authors.lastname: Tokuda
authors.forename: Teruo
authors.initials: T
authors.lastname: Mukainaka
authors.forename: Hoyoky
authors.initials: H
authors.lastname: Nishino
authors.forename: Kuo-Hsiung
authors.initials: KH
authors.lastname: Lee
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D018890:Chemoprevention / Q000379:methods; D003603:Cytotoxins / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D018432:Drug Resistance, Multiple / Q000187:drug effects* / Q000502:physiology; D019008:Drug Resistance, Neoplasm / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D036702:Quassins / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*
chemical_list: D000470:Alkaloids; D003603:Cytotoxins; D036702:Quassins