title: Antioxidant activities of abietane diterpenoids isolated from Torreya nucifera leaves.
abstract: Investigation on antioxidant compounds from the ethanolic extracts of Torreya nucifera leaves resulted in the isolation of abietane diterpenoids, a known 18-methylesterferruginol (1) and a new 18-dimethoxyferruginol (2). The structures of compounds 1 and 2 were elucidated on the basis of their spectroscopic analyses. Compounds 1 and 2 inhibited the Cu2+-mediated, 2,2'-azobis(2-amidinopropane)hydrochloride-mediated and 3-morpholinosydnonimine-1-mediated low-density lipoprotein (LDL) oxidation in the thiobarbituric acid-reactive substances assay as well as the macrophage-mediated LDL oxidation. Compounds 1 and 2 exhibited the potent antioxidant activities in the conjugated diene production, relative electrophoretic mobility, and apoB-100 fragmentation on copper-mediated LDL oxidation. Compound 1 also suppressed nitric oxide production and inducible nitric oxide synthase expression in lipopolysaccharide-stimulated RAW264.7 cells.
authors.affiliation: National Research Laboratory of Lipid Metabolism & Atherosclerosis, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-333, Republic of Korea.
authors.forename: Woo Song
authors.initials: WS
authors.lastname: Lee
authors.forename: Ju-Ryoung
authors.initials: JR
authors.lastname: Kim
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Han
authors.forename: Ki Chang
authors.initials: KC
authors.lastname: Jang
authors.forename: Dai-Eun
authors.initials: DE
authors.lastname: Sok
authors.forename: Tae-Sook
authors.initials: TS
authors.lastname: Jeong
mesh_terms: D045784:Abietanes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D003300:Copper / Q000494:pharmacology; D015227:Lipid Peroxidation / Q000187:drug effects; D008077:Lipoproteins, LDL / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry*; D032490:Taxaceae / Q000737:chemistry*
chemical_list: D045784:Abietanes; D000975:Antioxidants; D008077:Lipoproteins, LDL; D003300:Copper