title: 3-Keto steroids from the marine organisms Dendrophyllia cornigera and Cymodocea nodosa.
abstract: The new (20R)-22E-cholesta-4,22-diene-3,6-dione (1), along with three known 3-keto steroids were isolated from the deep-water Mediterranean scleractinian coral Dendrophyllia cornigera (2-4). Moreover, four known related 3-keto steroids were isolated from the sea grass Cymodocea nodosa (5-8). The structure elucidation of steroid 1 and the full NMR resonance assignments of all isolated metabolites were based on interpretation of their spectral data. All compounds are reported for the first time as metabolites of the investigated organisms. Compounds 2 and 3 showed significant cytotoxicity against lung cancer NSCLC-N6 cell line.
authors.affiliation: University of Athens, Department of Pharmacy, Division of Pharmacognosy and Chemistry of Natural Products, Panepistimiopolis Zografou, Athens 157 71, Greece.
authors.forename: Ioanna
authors.initials: I
authors.lastname: Kontiza
authors.forename: Dennis
authors.initials: D
authors.lastname: Abatis
authors.forename: Katerina
authors.initials: K
authors.lastname: Malakate
authors.forename: Constantinos
authors.initials: C
authors.lastname: Vagias
authors.forename: Vassilios
authors.initials: V
authors.lastname: Roussis
mesh_terms: D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007664:Ketosteroids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D006109:Poaceae / Q000737:chemistry*; D013045:Species Specificity
chemical_list: D007664:Ketosteroids; C509440:cholesta-4,22-diene-3,6-dione