title: Localization of arachidonate 12-lipoxygenase in canine brain tissues.
abstract: The cytosol fraction from a thoroughly irrigated canine cerebrum was subjected to immunoaffinity chromatography using a monoclonal antibody against porcine leukocyte 12-lipoxygenase. Arachidonate 12-lipoxygenase eluted from the column with some retardation. The enzyme, with a specific activity of 9 nmol/min/mg of protein, converted arachidonic acid to 12(S)-hydroperoxy-5,8,10,14-eicosatetraenoic acid. The enzyme was active not only with arachidonic acid, but also with linoleic and alpha-linolenic acids. In contrast, 12-lipoxygenase of canine platelets was almost inactive with linoleic and alpha-linolenic acids, and the platelet enzyme was also distinguished from the cerebral enzyme in terms of reactivity with the anti-12-lipoxygenase antibody. 12-Lipoxygenase activity was also detected in the cytosol fractions of other parts of canine brain: basal ganglia, hippocampus, cerebellum, olfactory bulb, and medulla oblongata.
authors.affiliation: Division of Neurosurgery, School of Medicine, Tottori University, Yonago, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nishiyama
authors.forename: H
authors.initials: H
authors.lastname: Okamoto
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Hori
authors.forename: T
authors.initials: T
authors.lastname: Hada
authors.forename: N
authors.initials: N
authors.lastname: Ueda
authors.forename: S
authors.initials: S
authors.lastname: Yamamoto
authors.forename: H
authors.initials: H
authors.lastname: Tsukamoto
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Kirino
mesh_terms: D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D000818:Animals; D001092:Arachidonate 12-Lipoxygenase / Q000378:metabolism*; D001921:Brain / Q000201:enzymology*; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D003600:Cytosol / Q000201:enzymology; D004285:Dogs; D008401:Gas Chromatography-Mass Spectrometry; D006893:Hydroxyeicosatetraenoic Acids / Q000378:metabolism; D014018:Tissue Distribution; D014466:Ultraviolet Rays
chemical_list: D006893:Hydroxyeicosatetraenoic Acids; D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D001092:Arachidonate 12-Lipoxygenase