title: Bioactive steroids from the whole herb of Euphorbia chamaesyce.
abstract: Three new ergostane-type steroids, 3beta-hydroxy-4alpha, 14alpha-dimethyl-5alpha-ergosta-8,24(28)-dien-11 -one (1); 3beta, 11alpha-dihydroxy-4alpha,14alpha-dimethyl-5alpha -ergosta-8, 24(28)-dien-7-one (2); and 3beta,7alpha-dihydroxy-4alpha, 14alpha-dimethyl-5alpha-ergosta-8,24(28)-dien-11 -one (3), were isolated, together with two known triterpenoids, wrightial and lup-20(30)-ene-3beta,29-diol from the whole herb of Euphorbia chamaesyce. Compound 3 showed a potent inhibitory effect on Epstein-Barr virus early antigen activation induced by the tumor promoter 12-O-tetradecanoylphorbol 13-acetate (TPA).
authors.affiliation: Department of Medicinal Chemistry, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan. tanakar@oysun01.oups.ac.jp
authors.forename: R
authors.initials: R
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Kasubuchi
authors.forename: S
authors.initials: S
authors.lastname: Kita
authors.forename: H
authors.initials: H
authors.lastname: Tokuda
authors.forename: H
authors.initials: H
authors.lastname: Nishino
authors.forename: S
authors.initials: S
authors.lastname: Matsunaga
mesh_terms: D000956:Antigens, Viral / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D019665:Euphorbiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013057:Spectrum Analysis; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000956:Antigens, Viral; C033305:Epstein-Barr virus early antigen; D013256:Steroids