title: Cytotoxicity and immunomodulating characteristics of labdane diterpenes from Marrubium cylleneum and Marrubium velutinum.
abstract: From the aerial parts of Marrubium cylleneum, one labdane nor-diterpene has been isolated together with two labdane diterpenes, hitherto not known as natural products. The structures of the isolated compounds were established by means of NMR [(1)H-(1)H-COSY, (1)H-(13)C-HSQC, HMQC-TOCSY, HMBC, NOESY] and MS spectral analyses. Several diterpenoids from M. cylleneum and M. velutinum were tested for their cytotoxic effect against various cancer cell lines and their immunomodulating potential in human peripheral blood mononuclear cells in standard in vitro assays. Our results show a differential cytotoxicity of some compounds as well as their ability to improve selected lymphocyte functions.
authors.affiliation: Department of Pharmacognosy and Chemistry of Natural Products, School of Pharmacy, University of Athens, Panepistimiopolis, Zografou, 157 71, Athens, Greece.
authors.forename: Anastasia
authors.initials: A
authors.lastname: Karioti
authors.forename: Margarita
authors.initials: M
authors.lastname: Skopeliti
authors.forename: Ourania
authors.initials: O
authors.lastname: Tsitsilonis
authors.forename: Jörg
authors.initials: J
authors.lastname: Heilmann
authors.forename: Helen
authors.initials: H
authors.lastname: Skaltsa
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D007155:Immunologic Factors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D008214:Lymphocytes / Q000187:drug effects; D027522:Marrubium / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes; D007155:Immunologic Factors