title: Anti-AIDS agents, 18. Sodium and potassium salts of caffeic acid tetramers from Arnebia euchroma as anti-HIV agents.
abstract: Monosodium and monopotassium salts [2-4] of isomeric caffeic acid tetramers were isolated from Arnebia euchroma as anti-HIV agents. Mixtures of dipotassium and disodium salts [1] of a caffeic acid tetramer and dipotassium and potassium-sodium salts [5] of a caffeic acid tetramer glucoside were also isolated from the active fraction. The structures of 1-5 were characterized by chemical and spectral evidence. Compounds 2-4 demonstrated potent anti-HIV activity with EC50 values of 2.8, 4.0, and 1.5 micrograms/ml, respectively. Treatment of 1-4 with dilute HCl yielded known caffeic acid tetramers [8 and 9], which were found to be less active, indicating the importance of the sodium and potassium salts to the enhanced anti-HIV activity.
authors.affiliation: Natural Products Laboratory, School of Pharmacy, University of North Carolina, Chapel Hill 27599, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Kashiwada
authors.forename: M
authors.initials: M
authors.lastname: Nishizawa
authors.forename: T
authors.initials: T
authors.lastname: Yamagishi
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: G
authors.initials: G
authors.lastname: Nonaka
authors.forename: L M
authors.initials: LM
authors.lastname: Cosentino
authors.forename: J V
authors.initials: JV
authors.lastname: Snider
authors.forename: K
authors.initials: K
authors.lastname: Lee
mesh_terms: D000998:Antiviral Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D002109:Caffeic Acids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D002460:Cell Line; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000494:pharmacology*; D006678:HIV / Q000187:drug effects*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D002109:Caffeic Acids; D004365:Drugs, Chinese Herbal