Studies on the mechanism of omega-hydroxylation of platelet 12-hydroxyeicosatetraenoic acid (12-HETE) by unstimulated neutrophils.

Studies on the mechanism of omega-hydroxylation of platelet 12-hydroxyeicosatetraenoic acid (12-HETE) by unstimulated neutrophils.
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未刺激的中性粒细胞对血小板 12-羟基二十碳四烯酸 (12-HETE) 的 omega-羟基化机制的研究。

DOI:
10.1172/jci112781
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发表时间:
1987
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
vonSchacky,C
vonSchacky,C
中科院分区:
--
文献类型:
--
作者:
Marcus,AJ;Safier,LB;Ullman,HL;Islam,N;Broekman,MJ;vonSchacky,C

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在阿司匹林存在或不存在的情况下,刺激的血小板合成显著量的12-羟基二十碳四烯酸(12-HETE),其是趋化性和趋化动力学的,并且增强单核细胞促凝血活性。在受刺激的血小板和未受刺激的中性粒细胞之间的细胞-细胞相互作用期间,血小板12-HETE被中性粒细胞代谢为12,20-二羟基二十碳四烯酸(12,20-DiHETE)。研究了负责这种ω-羟基化的未受刺激的中性粒细胞中酶系统的特征。广泛的细胞色素P-450抑制剂,以及白三烯B4,阻止12,20-DiHETE的形成。主要由于释放的蛋白酶,中性粒细胞匀浆废除活动。用氟磷酸二异丙酯预处理保留了中性粒细胞匀浆的活性。12-HETE的ω-羟基化仅限于微粒体部分。比活性增加6.6倍相比,中性粒细胞超声。电子供体NADPH是必需的辅因子。这些结果表明,未受刺激的人中性粒细胞中的酶是细胞色素P-450单加氧酶,该酶在这种细胞-细胞相互作用中将12-HETE从受刺激的血小板代谢为12,20-DiHETE。
Stimulated platelets, in the presence or absence of aspirin, synthesize significant quantities of 12-hydroxyeicosatetraenoic acid (12-HETE), which is chemotactic and chemokinetic, and enhances mononuclear cell procoagulant activity. During a cell-cell interaction between stimulated platelets and unstimulated neutrophils, platelet 12-HETE is metabolized to 12,20-dihydroxyeicosatetraenoic acid (12,20-DiHETE) by neutrophils. Characteristics of the enzyme system in unstimulated neutrophils responsible for this omega-hydroxylation were investigated. A broad range of cytochrome P-450 inhibitors, as well as leukotriene B4, blocked formation of 12,20-DiHETE. Owing largely to released proteases, neutrophil homogenization abolished activity. Pretreatment with diisopropylfluorophosphate preserved activity in neutrophil homogenates. omega-Hydroxylation of 12-HETE was confined solely to the microsomal fraction. Specific activity increased 6.6-fold compared with neutrophil sonicates. The electron donor NADPH was a required cofactor. These results indicate that the enzyme in unstimulated human neutrophils, which metabolizes 12-HETE from stimulated platelets to 12,20-DiHETE in this cell-cell interaction, is a cytochrome P-450 monooxygenase.
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