title: Occurrence of singlet oxygen oxygenation of oleic acid and linoleic acid in the skin of live mice.
abstract: To assess the contribution of singlet molecular oxygen [O(2) ((1)Delta(g))] to lipid peroxidation in vivo, this study combined gas chromatography-mass spectrometry with thin layer chromatography to analyse peroxidized lipids in the skin of hairless mice. Hydroxyoctadecenoate isomers and unconjugated hydroxyoctadecadienoate isomers derived from peroxidized oleic acid and linoleic acid, respectively, which are specific to O(2) ((1)Delta(g))-dependent oxygenation, were detected in the skin of live mice under ordinary feeding conditions. Short-term ultraviolet A (UVA)-irradiation of the skin in vivo elevated levels of the unconjugated hydroxyoctadecadienoate isomers significantly, whereas the irradiation of skin homogenate in vitro increased levels of all isomers derived from both O(2) ((1)Delta(g)) and free radical-dependent oxygenation to a much greater extent. This is the first report to demonstrate the occurrence of O(2) ((1)Delta(g))-specific oxygenation of unsaturated fatty acids in living animals.
authors.affiliation: Department of Food Science, Graduate School of Nutrition and Bioscience, The University of Tokushima, Tokushima, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Minami
authors.forename: Kanako
authors.initials: K
authors.lastname: Yokoyama
authors.forename: Noriko
authors.initials: N
authors.lastname: Bando
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Kawai
authors.forename: Junji
authors.initials: J
authors.lastname: Terao
mesh_terms: D000818:Animals; D002849:Chromatography, Gas / Q000379:methods; D002855:Chromatography, Thin Layer; D005609:Free Radicals; D019787:Linoleic Acid / Q000737:chemistry*; D015227:Lipid Peroxidation; D008297:Male; D013058:Mass Spectrometry / Q000379:methods; D051379:Mice; D008812:Mice, Hairless; D019301:Oleic Acid / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D026082:Singlet Oxygen; D012867:Skin / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D005609:Free Radicals; D026082:Singlet Oxygen; D019301:Oleic Acid; D019787:Linoleic Acid; D010100:Oxygen