title: Cytotoxic caged-polyprenylated xanthonoids and a xanthone from Garcinia cantleyana.
abstract: Phytochemical studies on the leaves and trunk bark of Garcinia cantleyana yielded five caged-xanthonoids including one tetra- and four tri-prenylated xanthones, cantleyanone A (1), 7-hydroxyforbesione (2) and cantleyanones B-D (4-6), as well as a simple xanthone, 4-(1,1-dimethylprop-2-enyl)-1,3,5,8-tetrahydroxyxanthone (3). Eight other known compounds, deoxygaudichaudione A, gaudichaudione H, friedelin, garbogiol, macranthol, glutin-5-en-3beta-ol, and a mixture of sitosterol and stigmasterol were also isolated. Their structures were elucidated by means of spectroscopic data and comparison of their NMR data with literature values. Significant cytotoxicity against MDA-MB-231, CaOV-3, MCF-7 and HeLa cancer cell-lines was demonstrated by cantleyanones B-D, 7-hydroxyforbesione, deoxygaudichaudione A and macranthol, with IC(50) values ranging from 0.22 to 17.17 microg/ml.
authors.affiliation: Laboratory of Natural Products, Institute of Bioscience, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
authors.forename: Khalid A
authors.initials: KA
authors.lastname: Shadid
authors.forename: Khozirah
authors.initials: K
authors.lastname: Shaari
authors.forename: Faridah
authors.initials: F
authors.lastname: Abas
authors.forename: Daud A
authors.initials: DA
authors.lastname: Israf
authors.forename: Ahmad S
authors.initials: AS
authors.lastname: Hamzah
authors.forename: Normawati
authors.initials: N
authors.lastname: Syakroni
authors.forename: Khoushik
authors.initials: K
authors.lastname: Saha
authors.forename: Nordin Hj
authors.initials: NH
authors.lastname: Lajis
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D029760:Garcinia / Q000737:chemistry*; D006801:Humans; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D054876:Prenylation; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D044004:Xanthones; C009689:xanthone