title: Inhibitors of nitric oxide synthesis and TNF-alpha expression from Magnolia obovata in activated macrophages.
abstract: Nitric oxide (NO) and tumor necrosis factor-alpha (TNF-alpha) are the major mediators produced in activated macrophages which contribute to the circulatory failure associated with septic shock. An activity-guided fractionation of an MeOH extract of stem bark of Magnolia obovata afforded two inhibitors of NO production in lipopolysaccharides (LPS)-activated macrophages by the suppression of i-NOS expression. Their structures were elucidated by spectroscopic methods to be magnolol and honokiol with IC50 values of 16.8 and 6.4 microM, respectively. They also inhibited the production of TNF-alpha in LPS-activated macrophages. Thus, these compounds may be possible candidates for the development of new drugs to treat endotoxemia accompanied by the overproduction of NO and TNF-alpha.
authors.forename: H J
authors.initials: HJ
authors.lastname: Son
authors.forename: H J
authors.initials: HJ
authors.lastname: Lee
authors.forename: H S
authors.initials: HS
authors.lastname: Yun-Choi
authors.forename: J H
authors.initials: JH
authors.lastname: Ryu
mesh_terms: D000818:Animals; D001713:Biphenyl Compounds / Q000737:chemistry / Q000494:pharmacology*; D015153:Blotting, Western; D002460:Cell Line; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D017705:Lignans; D008070:Lipopolysaccharides; D008262:Macrophage Activation; D008264:Macrophages / Q000187:drug effects*; D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000737:chemistry*; D051379:Mice; D009569:Nitric Oxide / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors*; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000378:metabolism; D000498:Allyl Compounds; D010636:Phenols
chemical_list: D001713:Biphenyl Compounds; D004791:Enzyme Inhibitors; D017705:Lignans; D008070:Lipopolysaccharides; D009569:Nitric Oxide; D019001:Nitric Oxide Synthase; D014409:Tumor Necrosis Factor-alpha; C005498:magnolol; C005499:honokiol; D000498:Allyl Compounds; D010636:Phenols