title: Singlet-oxygen-derived products from linoleate activate Nrf2 signaling in skin cells.
abstract: Linoleates are required for normal mammalian health and development, but they are also prone to oxidation, resulting in biologically active metabolites such as hydroxyoctadecadienoic acids (HODEs). To investigate the biological activity of 9-EZ-HODE, 10-EZ-HODE, 12-ZE-HODE, and 13-ZE-HODE, the metabolites of singlet-oxygen-derived products from linoleates, we assessed adaptive cytoprotection in HaCaT skin cells. Treating HaCaT cells with sublethal concentrations of 10-EZ-HODE and 12-ZE-HODE, which are singlet-oxygen-mediated specific oxidation metabolites of linoleates, but not 9-EZ-HODE and 13-ZE-HODE, caused resistance to hydrogen peroxide-induced oxidative damage. Microarray analysis of HaCaT cells revealed that 10-EZ-HODE and 12-ZE-HODE induced cellular antioxidant genes that are responsive to nuclear factor-erythroid 2 p45-related factor 2 (Nrf2), such as heme oxygenase-1 and glutathione synthesis enzymes. Although 10-EZ-HODE and 12-ZE-HODE did not induce Nrf2 mRNA, treatment with these metabolites increased the intranuclear expression of Nrf2. These results suggest that 10-EZ-HODE and 12-ZE-HODE initiate adaptive responses that reduce the damage caused by oxidative stress.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan. Electronic address: yoko-ogawa@aist.go.jp.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Akazawa-Ogawa
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
authors.forename: Mototada
authors.initials: M
authors.lastname: Shichiri
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Nishio
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
authors.forename: Yasukazu
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
authors.forename: Etsuo
authors.initials: E
authors.lastname: Niki
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Hagihara
mesh_terms: D002460:Cell Line; D002853:Chromatography, Liquid; D051547:Heme Oxygenase-1 / Q000378:metabolism; D006801:Humans; D019787:Linoleic Acid / Q000378:metabolism*; D051267:NF-E2-Related Factor 2 / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D021381:Protein Transport; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism; D015398:Signal Transduction; D026082:Singlet Oxygen / Q000737:chemistry / Q000378:metabolism*; D012867:Skin / Q000166:cytology / Q000378:metabolism*; D053719:Tandem Mass Spectrometry; D014466:Ultraviolet Rays
chemical_list: D051267:NF-E2-Related Factor 2; C495635:NFE2L2 protein, human; D016755:Proto-Oncogene Proteins c-jun; D026082:Singlet Oxygen; D019787:Linoleic Acid; D051547:Heme Oxygenase-1
keywords: Cell signaling; Fatty acid oxidation; Free radicals; Glutathione synthase; Lipid oxidation; Nrf2; Nuclear factor 2-erythroid 2 p45-related factor 2