title: Rearranged jatrophane-type diterpenes from euphorbia species. Evaluation of their effects on the reversal of multidrug resistance.
abstract: The rearranged jatrophane-type diterpenes ( 1 - 3), isolated from the Me (2)CO extracts of Euphorbia portlandica and Euphorbia segetalis, were examined for their effects on multidrug resistance (MDR) in mouse lymphoma cells. Compounds 2 and 3 revealed to be active with the latter being more active than the positive control verapamil, a known resistance modifier. The new compound 1, named portlandicine, was isolated from Euphorbia portlandica and its structure characterised by high-field NMR spectroscopic methods including 2D NMR techniques: COSY, HMQC, HMBC and NOESY. The known diterpene 2, together with aleuritolic acid ( 4), oleanolic acid ( 5), and betulin diacetate ( 6), were also isolated from the same species.
authors.affiliation: Centro de Estudos de Ciências Farmacêuticas, Faculdade de Farmácia da Universidade de Lisboa, Lisboa, Portugal.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Madureira
authors.forename: Maria-José U
authors.initials: MJ
authors.lastname: Ferreira
authors.forename: Nora
authors.initials: N
authors.lastname: Gyémánt
authors.forename: Katalin
authors.initials: K
authors.lastname: Ugocsai
authors.forename: José R
authors.initials: JR
authors.lastname: Ascenso
authors.forename: Pedro M
authors.initials: PM
authors.lastname: Abreu
authors.forename: Judit
authors.initials: J
authors.lastname: Hohmann
authors.forename: Joseph
authors.initials: J
authors.lastname: Molnár
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor / Q000187:drug effects; D004224:Diterpenes / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D028481:Euphorbia; D008223:Lymphoma; D051379:Mice; D008517:Phytotherapy; D035261:Plant Components, Aerial; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D004224:Diterpenes; D010936:Plant Extracts; C468576:jatrophene diterpene