title: Rearranged ent-kauranes from the stems of Tricalysia dubia and their biological activities.
abstract: From the EtOAc-soluble fraction of an MeOH extract of the stems of Tricalysia dubia, two new rearranged ent-kaurane derivatives, named tricalysiolides H and I, were isolated, together with five known rearranged ent-kauranes, i.e. tricalysiolides A-E, stigmast-4-en-6beta-ol-3-one, (+)-pinoresinol, scopoletin and syringaldehyde. Their structures were elucidated from spectroscopic evidence, and their cytotoxicity toward KB cells and P-gp inhibitory activity were assayed.
authors.affiliation: Department of Pharmacognosy, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Tamaki
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Matsunami
authors.forename: Hideaki
authors.initials: H
authors.lastname: Otsuka
authors.forename: Takakazu
authors.initials: T
authors.lastname: Shinzato
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Aramoto
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Takeda
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000187:drug effects; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology*; D045786:Diterpenes, Kaurane / Q000302:isolation & purification / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D005434:Flow Cytometry; D006801:Humans; D020014:K562 Cells; D007624:KB Cells; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology*; D018547:Plant Stems; D019666:Rubiaceae / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000972:Antineoplastic Agents, Phytogenic; D045786:Diterpenes, Kaurane; D010936:Plant Extracts