title: Influence of a fibric acid type of hypolipidemic agent on the oxidative metabolism of arachidonic acid by liver microsomal cytochrome P-450.
abstract: The regiospecificity of arachidonic acid oxygenation, catalyzed by rat liver microsomal fractions in the presence of NADPH, can be altered by animal pretreatment with a fibric acid type of hypolipidemic drug, ciprofibrate. While microsomal fractions isolated from either control or phenobarbital-treated animals oxygenate arachidonic acid to mainly epoxyeicosatrienoic acids (EETs), animal pretreatment with ciprofibrate results in an eightfold stimulation of omega and omega-1 oxidation, concomitant with a net decrease in the formation of both HETEs and EETs. The isomeric composition of the EETs and of the omega and omega-1 oxidation products formed is also dependent on the type of animal pretreatment. Associated decreases in the amounts of HETEs and the rate of hydrogen peroxide formation suggests a modification of the "uncoupler action" of arachidonic acid during the function of different cytochromes P-450.
mesh_terms: D015126:8,11,14-Eicosatrienoic Acid / Q000031:analogs & derivatives / Q000378:metabolism; D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism*; D001589:Benzphetamine / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D002994:Clofibrate / Q000031:analogs & derivatives*; D002995:Clofibric Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000378:metabolism; D058607:Fibric Acids; D008401:Gas Chromatography-Mass Spectrometry; D006893:Hydroxyeicosatetraenoic Acids / Q000378:metabolism; D000960:Hypolipidemic Agents / Q000494:pharmacology*; D007850:Lauric Acids / Q000378:metabolism; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D009249:NADP / Q000378:metabolism; D010084:Oxidation-Reduction; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D001095:Arachidonic Acids; D005231:Fatty Acids, Unsaturated; D058607:Fibric Acids; D006893:Hydroxyeicosatetraenoic Acids; D000960:Hypolipidemic Agents; D007850:Lauric Acids; D001589:Benzphetamine; C030358:lauric acid; D016718:Arachidonic Acid; D009249:NADP; D002995:Clofibric Acid; C046782:14,15-epoxy-5,8,11-eicosatrienoic acid; D003577:Cytochrome P-450 Enzyme System; C019304:ciprofibrate; D015126:8,11,14-Eicosatrienoic Acid; D002994:Clofibrate