title: Studies on inhibitors of skin tumor promotion, IX. Neolignans from Magnolia officinalis.
abstract: Three neolignans, known as magnolol [1], honokiol [2] and the new monoterpenylmagnolol [3], were isolated from the bark of Magnolia officinalis as inhibitors of Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol-13-acetate (TPA). The structure of 3 was determined from 2D nmr spectral data and difference nOe experiments. The MeOH extract of this plant and magnolol exhibited remarkable inhibitory effects on mouse skin tumor promotion in an in vivo two stage carcinogenesis test. This investigation indicates that these neolignans and the extract might be valuable antitumor promoters.
authors.affiliation: Kyoto Pharmaceutical University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Konoshima
authors.forename: M
authors.initials: M
authors.lastname: Kozuka
authors.forename: H
authors.initials: H
authors.lastname: Tokuda
authors.forename: H
authors.initials: H
authors.lastname: Nishino
authors.forename: A
authors.initials: A
authors.lastname: Iwashima
authors.forename: M
authors.initials: M
authors.lastname: Haruna
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: M
authors.initials: M
authors.lastname: Tanabe
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D002472:Cell Transformation, Viral / Q000187:drug effects; D005260:Female; D004854:Herpesvirus 4, Human; D006801:Humans; D017705:Lignans; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D008813:Mice, Inbred ICR; D015394:Molecular Structure; D010212:Papilloma / Q000517:prevention & control; D010944:Plants; D012878:Skin Neoplasms / Q000517:prevention & control*; D014407:Tumor Cells, Cultured; D000498:Allyl Compounds; D010636:Phenols
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D001713:Biphenyl Compounds; D017705:Lignans; C005498:magnolol; C005499:honokiol; D000498:Allyl Compounds; D010636:Phenols; C071756:monoterpenylmagnolol