title: Lipoxygenase metabolism of arachidonic acid in brain.
abstract: When blood-free mouse brain slices were incubated with exogenous radiolabeled arachidonic acid, gas chromatography/mass spectrometry confirmed that the major radioactive lipoxygenase enzyme product of arachidonic acid was 12-hydroxy-5,8,10,14-eicosatetraenoic acid (12-HETE), with lesser amounts of 5-hydroxy-5,6,8,11,14-eicosatetraenoic acid and 15-hydroxy-5,8,11,13-eicosatetraenoic acid. When 12-[2H]HETE was used to measure endogenous 12-HETE in brain tissue frozen with liquid nitrogen, the level of 12-HETE was 41 +/- 6 ng/g of wet weight tissue. This frozen tissue level was not due to the presence of blood. When brain slices were incubated in vitro for 20 min, the 12-HETE level increased to 964 +/- 35 ng/g of wet weight tissue. Elimination of residual intravascular blood before tissue incubation reduced the brain slice 12-HETE concentration by one-half.
mesh_terms: D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism*; D001921:Brain / Q000201:enzymology / Q000378:metabolism*; D001923:Brain Chemistry; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry; D006168:Guinea Pigs; D006893:Hydroxyeicosatetraenoic Acids / Q000032:analysis / Q000378:metabolism; D008084:Lipoxygenase / Q000378:metabolism*; D008297:Male; D051379:Mice; D013189:SRS-A / Q000032:analysis
chemical_list: D001095:Arachidonic Acids; D006893:Hydroxyeicosatetraenoic Acids; D013189:SRS-A; D016718:Arachidonic Acid; C022022:5-hydroxy-6,8,11,14-eicosatetraenoic acid; D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; C025984:15-hydroxy-5,8,11,13-eicosatetraenoic acid; D008084:Lipoxygenase