title: Brazilian natural medicines. IV. New noroleanane-type triterpene and ecdysterone-type sterol glycosides and melanogenesis inhibitors from the roots of Pfaffia glomerata.
abstract: The ethyl acetate and 1-butanol soluble fractions of the roots of Pfaffia glomerata were found to show inhibitory effects on melanogenesis in theophylline-stimulated B16 melanoma 4A5 cells. From the ethyl acetate and 1-butanol soluble fractions, we isolated a new noroleanane-type triterpene, pfaffianol A, its glycosides, pfaffiaglycosides A and B, and ecdysterone-type sterol glycosides, pfaffiaglycosides C, D, and E, together with eight known constituents. The structures of new constituents were determined on the basis of physicochemical and chemical evidence. Among them, pfaffianol A (IC(50)=44 microM) and pfaffoside C (IC(50)=92 microM) substantially inhibited melanogenesis without cytotoxic effects. The inhibitory effects were stronger than that of reference compound, arbutin (IC(50)=174 microM).
authors.affiliation: Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8412, Japan.
authors.forename: Seikou
authors.initials: S
authors.lastname: Nakamura
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Souichi
authors.initials: S
authors.lastname: Nakashima
authors.forename: Hisashi
authors.initials: H
authors.lastname: Matsuda
authors.forename: Yuehu
authors.initials: Y
authors.lastname: Pei
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D027703:Amaranthaceae / Q000737:chemistry*; D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology; D001938:Brazil; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D004441:Ecdysterone / Q000737:chemistry* / Q000494:pharmacology; D006027:Glycosides / Q000737:chemistry* / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D008546:Melanoma, Experimental; D051379:Mice; D009828:Oleanolic Acid / Q000737:chemistry* / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D013261:Sterols / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D006027:Glycosides; D010936:Plant Extracts; D013261:Sterols; D004441:Ecdysterone; D009828:Oleanolic Acid