title: In vitro anti-inflammatory activity of 3-O-methyl-flavones isolated from Siegesbeckia glabrescens.
abstract: Four flavones, 3,4'-O-dimethylquercetin (1), 3,7-O-dimethylquercetin (2), 3-O-methylquercetin (3) and 3,7,4'-O-trimethylquercetin (4) were isolated as the inhibitors of nitric oxide production in activated microglia (IC(50) values: 11.1, 4.2, 3.8, and 25.1 microM, respectively). They suppressed the expression of protein and mRNA of inducible nitric oxide synthase. Furthermore, compounds 2 and 3 showed scavenging activity of peroxynitrite with SC(50) values of 1.75 and 0.77 microM, respectively.
authors.affiliation: College of Pharmacy, Sookmyung Women's University, 52 Hyochangwon-Gil, Yongsan-Gu, Seoul 140-742, Republic of Korea.
authors.forename: Jae Yeon
authors.initials: JY
authors.lastname: Kim
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Lim
authors.forename: Jae-Ha
authors.initials: JH
authors.lastname: Ryu
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000302:isolation & purification* / Q000494:pharmacology*; D019659:Asteraceae / Q000737:chemistry*; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D047309:Flavones / Q000302:isolation & purification / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D051379:Mice; D017628:Microglia / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D009569:Nitric Oxide / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D052247:Nitric Oxide Synthase Type II / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D011794:Quercetin / Q000031:analogs & derivatives*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D047309:Flavones; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D009569:Nitric Oxide; D011794:Quercetin; D052247:Nitric Oxide Synthase Type II