title: Comparison of the in vitro effect of eicosapentaenoic acid (EPA)-derived lipoxygenase metabolites on human platelet function with those of arachidonic acid.
abstract: Eicosapentaenoic acid (EPA) has been reported to have a potent anti-aggregatory activity and to be efficiently metabolized by 12-lipoxygenase, not by cyclooxygenase in platelets. In vitro effect of 12-lipoxygenase metabolites of EPA on platelet function was studied and compared with those of arachidonic acid (AA). The 12-lipoxygenase metabolites of AA and EPA; 12-hydroperoxyeicosatetraenoic acid (12-HPETE) and 12-hydroperoxyeicosapentaenoic acid (12-HPEPE), and their hydroxy derivatives, 12-hydroxyeicosatetraenoic acid (12-HETE) and 12-hydroxyeicosapentaenoic acid (12-HEPE) were prepared enzymatically using human platelet lysate. These compounds were purified by high performance liquid chromatography and identified by gas chromatography mass spectrometry. 12-HPETE and 12-HPEPE inhibited dose-dependently washed human platelet aggregation and serotonin (5-HT) release induced by AA and collagen. The potency of 12-HPEPE was almost equal to that of 12-HPETE. Their hydroxy derivatives, 12-HETE and 12-HEPE were less potent. 12-hydroperoxy derivatives of AA and EPA were the most potent in inhibiting platelet aggregation and 5-HT release among 5-, 12- and 15-hydroperoxy isomers of AA and EPA. The inhibitory effects of 12-HPETE and 12-HPEPE on platelet aggregation were additive.
mesh_terms: D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D001091:Arachidonate Lipoxygenases; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects* / Q000502:physiology; D015118:Eicosapentaenoic Acid / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology*; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000494:pharmacology; D066298:In Vitro Techniques; D007536:Isomerism; D015289:Leukotrienes; D008084:Lipoxygenase / Q000378:metabolism; D010974:Platelet Aggregation / Q000187:drug effects; D012701:Serotonin / Q000378:metabolism
chemical_list: D001095:Arachidonic Acids; D006893:Hydroxyeicosatetraenoic Acids; D015289:Leukotrienes; C048579:12-hydroperoxy-5,8,11,14,17-eicosapentaenoic acid; D016718:Arachidonic Acid; D012701:Serotonin; D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; C021201:12-HPETE; C026221:12-hydroxy-5,8,10,14,17-eicospentaenoic acid; D015118:Eicosapentaenoic Acid; D001091:Arachidonate Lipoxygenases; D008084:Lipoxygenase