Neutrophil oxygen reduction: The enzymes and the products

Alfred I. Tauber , Bernard M. Babior
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引用次数: 82

Abstract

The human neutrophil generates a non-mitochondrial respiratory burst by the activation of a NADPH-oxidase, whose electron source, NADPH, is generated in the hexose monophosphate shunt. The reduction product, 2, is further reduced to H2O2, which upon the action of myeloperoxidase, oxidizes halide to form reactive chloramines and hypochlorous acid. The elusive hydroxyl radical, or kindred species, also appears as a product of the burst, but this chemistry has not been elucidated. NADPH-oxidase is a complex activity, comprised of at least two components: a low potential b cytochrome and a flavoprotein. Partial characterization and isolation of this electron transport system has been accomplished and serves as an intense focus of current research. The recent demonstration that the oxidase may be activated in a broken cell preparation should not only define mechanisms of burst activation, but this methodology should provide a powerful approach towards identifying the components of the NADPH-oxidase apparatus.

中性粒细胞氧还原:酶和产物
人中性粒细胞通过NADPH氧化酶的激活产生非线粒体呼吸爆发,其电子源NADPH在单磷酸己糖分流中产生。还原产物2−进一步还原为H2O2,在髓过氧化物酶的作用下,将卤化物氧化生成活性氯胺和次氯酸。难以捉摸的羟基自由基,或类似的物种,也作为爆发的产物出现,但这种化学反应尚未被阐明。nadph氧化酶是一种复杂的活性,由至少两种成分组成:低电位b细胞色素和黄素蛋白。该电子传递系统的部分表征和分离已经完成,并成为当前研究的热点。最近的研究表明,氧化酶可能在破碎的细胞中被激活,这不仅定义了破裂激活的机制,而且这种方法应该为识别nadph氧化酶装置的组成提供了有力的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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