title: Pregnane, coumarin and lupane derivatives and cytotoxic constituents from Helicteres angustifolia.
abstract: 2alpha,7beta,20alpha-Trihydroxy-3beta,21-dimethoxy-5-pregnene (1), 6,7,9alpha-trihydroxy-3,8,11alpha-trimethylcyclohexo-[d,e]-coumarin (2), 3beta-hydroxy-27-benzoyloxylup-20(29)-en-28-oic acid (3), and 3beta-hydroxy-27-benzoyloxylup-20(29)-en-28-oic acid methyl ester (4), along with 24 known compounds were isolated and structurally characterized from roots and aerial parts of Helicteres angustifolia (Sterculiaceae). In a preliminary bioassay, the two cucurbitacin derivatives, cucurbitacin D and J exhibited significant inhibitory activities against the growth of both hepatocellular carcinoma BEL-7402 cells and malignant melanoma SK-MEL-28 cells in vitro.
authors.affiliation: Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Department of Natural Products Chemistry, 555 Zuchongzhi Road, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China.
authors.forename: Wenliang
authors.initials: W
authors.lastname: Chen
authors.forename: Weidong
authors.initials: W
authors.lastname: Tang
authors.forename: Liguang
authors.initials: L
authors.lastname: Lou
authors.forename: Weimin
authors.initials: W
authors.lastname: Zhao
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D045744:Cell Line, Tumor; D003374:Coumarins / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D006801:Humans; D019660:Malvaceae / Q000737:chemistry*; D008968:Molecular Conformation; D019906:Nuclear Magnetic Resonance, Biomolecular; D035261:Plant Components, Aerial / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D011278:Pregnanes / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D053978:Pentacyclic Triterpenes
chemical_list: D000970:Antineoplastic Agents; D003374:Coumarins; D011278:Pregnanes; D014315:Triterpenes; C480546:lupane; D053978:Pentacyclic Triterpenes; C030123:coumarin