title: Antioxidative action of diterpenoids from Podocarpus nagi.
abstract: Diterpenoids, totarol (1), totaradiol (2), 19-hydroxytotarol (3), totaral (4), 4 beta-carboxy-19-nortotarol (5), sugiol (6), isolated from Podocarpus nagi, were evaluated as antioxidants. Microsomal lipid peroxidation induced by Fe(III)-ADP/NADPH and mitochondrial lipid peroxidation induced by Fe(III)-ADP/ NADH were inhibited by these terpenoids. They inhibited linoleic acid autoxidation but not generation of superoxide anion. Totarol (1) protected mitochondrial respiratory enzyme activities against NADPH induced oxidative injury. Totarane diterpenes from P. nagi were shown to be effective to protect biological systems and function against various oxidative stresses.
authors.affiliation: Faculty of Engineering, Fukuyama University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Haraguchi
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
authors.forename: I
authors.initials: I
authors.lastname: Kubo
mesh_terms: D045784:Abietanes; D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D007564:Japan; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000737:chemistry; D015227:Lipid Peroxidation / Q000187:drug effects*; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism*; D009245:NADH Dehydrogenase / Q000378:metabolism; D009249:NADP / Q000378:metabolism; D010084:Oxidation-Reduction; D018517:Plant Roots; D010946:Plants, Medicinal; D051381:Rats; D013384:Succinate Cytochrome c Oxidoreductase / Q000378:metabolism; D013481:Superoxides / Q000032:analysis
chemical_list: D045784:Abietanes; D000975:Antioxidants; D004224:Diterpenes; D008041:Linoleic Acids; D013481:Superoxides; D009249:NADP; C078548:totarol; D019787:Linoleic Acid; D013384:Succinate Cytochrome c Oxidoreductase; D009245:NADH Dehydrogenase