title: Potential cancer chemopreventive agents from Arbutus unedo.
abstract: A phytochemical study of the petroleum ether and ethyl acetate extracts of the entire plant of Arbutus unedo led to the isolation of a new sterol, 7beta-hydroxystigmast-4-en-3-one (1), and nine known compounds of the flavan, steroid, and terpenoid types. The structure of 1 was determined by spectroscopic data interpretation in combination with molecular modeling calculations. The absolute stereochemistry of C-7 was assigned as S for compound 1 based on the obtained CD spectral data. Activity in the JB6 cell transformation assay was found for pomolic acid 3-acetate (4). All isolates obtained were evaluated in a cyclooxygenase-2 (COX-2) inhibition assay.
authors.affiliation: Program for Collaborative Research in the Pharmaceutical Sciences and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, IL 60612, USA.
authors.forename: Esperanza J
authors.initials: EJ
authors.lastname: Carcache-Blanco
authors.forename: Muriel
authors.initials: M
authors.lastname: Cuendet
authors.forename: Eun Jung
authors.initials: EJ
authors.lastname: Park
authors.forename: Bao-Ning
authors.initials: BN
authors.lastname: Su
authors.forename: J Fausto
authors.initials: JF
authors.lastname: Rivero-Cruz
authors.forename: Norman R
authors.initials: NR
authors.lastname: Farnsworth
authors.forename: John M
authors.initials: JM
authors.lastname: Pezzuto
authors.forename: A
authors.initials: A
authors.lastname: Douglas Kinghorn
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D052246:Cyclooxygenase 2 Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D029791:Ericaceae / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D051379:Mice; D008958:Models, Molecular; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D052246:Cyclooxygenase 2 Inhibitors; D010936:Plant Extracts