title: Altered arachidonate metabolism by leukocytes and platelets in myeloproliferative disorders.
abstract: The arachidonate metabolism by leukocytes and platelets was studied in 14 patients with myeloproliferative disorders including 7 patients with chronic myeloid leukemia (CML), 5 with polycythemia vera (PV) and 2 with essential thrombocythemia (ET). When the leukocytes were incubated with arachidonate and A23187, leukotriene B4 and hydroxyeicosatetraenoic acids (HETEs) were constantly detected using reversed-phase high-performance liquid chromatography in normal subjects, while selective deficiency of 5-lipoxygenase products (leukotriene B4 and 5-HETE) was found in 4 patients with CML. this novel abnormality of the leukocytes seemed to be derived from the possible deficiency of 5-lipoxygenase in these patients' polymorphonuclear neutrophils (PMNNs). The formation of 15-HETE appeared to be almost normal in all the patients. Platelet 12-lipoxygenase deficiency was detected in 2 patients with PV and 2 with CML in whom one was associated with the deficiency of 5-lipoxygenase products. These bicellular abnormalities of the arachidonate metabolism might contribute to understand dysfunctions of PMNNs and platelets in some patients with myeloproliferative disorders.
mesh_terms: D001091:Arachidonate Lipoxygenases; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000097:blood*; D001792:Blood Platelets / Q000378:metabolism*; D000001:Calcimycin / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D007951:Leukemia, Myeloid / Q000097:blood; D007962:Leukocytes / Q000378:metabolism*; D007975:Leukotriene B4 / Q000097:blood; D008084:Lipoxygenase / Q000097:blood; D009196:Myeloproliferative Disorders / Q000097:blood*; D011087:Polycythemia Vera / Q000097:blood; D011451:Prostaglandin-Endoperoxide Synthases / Q000097:blood; D013922:Thrombocytosis / Q000097:blood
chemical_list: D001095:Arachidonic Acids; D007975:Leukotriene B4; D016718:Arachidonic Acid; D000001:Calcimycin; D001091:Arachidonate Lipoxygenases; D008084:Lipoxygenase; D011451:Prostaglandin-Endoperoxide Synthases