title: A new seco-abietane-type diterpene from the stem bark of Picea glehni.
abstract: A new seco-abietane-type diterpenoid, 13S-hydroxy-9-oxo-9,10-seco-abiet-8(14)-en-18,10alpha-olide (1) along with a known lignan compound, pinoresinol (2) was isolated from the stem bark of Picea glehni (Fr. Schm.) Masters. Spectroscopic methods and chemical conversions were used to establish the structure of 1. In order to assess their cancer chemopreventive potential, the inhibition of Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol 13-acetate (TPA) was examined for compound 1, its synthetic analogue, 9,10-seco-8S,13S-epoxy-abiet-8(14)-en-18,10alpha-olide (la) and 2. The inhibitory effect of la on EBV-EA induction was strong (0, 20.7, 67.1 and 89.2 % inhibition at 1000, 500,100 and 10 mol ratio/TPA). The IC50 of la was 226 mol ratio/32 pmol/TPA.
authors.forename: Reiko
authors.initials: R
authors.lastname: Tanaka
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Wada
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Kinouchi
authors.forename: Harukuni
authors.initials: H
authors.lastname: Tokuda
authors.forename: Shunyo
authors.initials: S
authors.lastname: Matsunaga
mesh_terms: D045784:Abietanes / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D002472:Cell Transformation, Viral / Q000187:drug effects; D002478:Cells, Cultured / Q000187:drug effects; D004854:Herpesvirus 4, Human / Q000502:physiology; D006801:Humans; D020128:Inhibitory Concentration 50; D008517:Phytotherapy; D028222:Picea; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D018547:Plant Stems
chemical_list: D045784:Abietanes; D000972:Antineoplastic Agents, Phytogenic; D010936:Plant Extracts