Myeloperoxidase produces nitrating oxidants in vivo.

Myeloperoxidase produces nitrating oxidants in vivo.
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髓过氧化物酶在体内产生硝化氧化剂。

DOI:
10.1172/jci15021
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发表时间:
2002
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Heinecke,JayW
Heinecke,JayW
中科院分区:
--
文献类型:
--
作者:
Gaut,JosephP;Byun,Jaeman;Tran,HungD;Lauber,WendyM;Carroll,JamesA;Hotchkiss,RichardS;Belaaouaj,Abderrazzaq;Heinecke,JayW

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尽管人们对产生活性氮的途径有浓厚的兴趣,但炎症组织损伤的生理相关机制仍然知之甚少。一种可能的介质是髓过氧化物酶,它是中性粒细胞、单核细胞和某些巨噬细胞群的主要成分。该酶利用过氧化氢和亚硝酸盐在体外生成3-硝基酪氨酸。为了确定髓过氧化物酶是否在体内产生硝化中间体,我们使用同位素稀释气相色谱/质谱法定量了两种腹膜炎症模型中的3-硝基酪氨酸:感染肺炎克雷伯菌的小鼠和盲肠结扎和穿刺的小鼠。两种模型均表现出强烈的中性粒细胞炎症反应,炎症液中含有明显升高的3-氯酪氨酸水平,这是髓过氧化物酶作用的标志。与之形成鲜明对比的是,3-硝基酪氨酸水平仅在感染肺炎克雷伯菌的小鼠中升高。注射肺炎克雷伯菌的小鼠体内的总亚硝酸盐和硝酸盐水平比盲肠结扎和穿刺的小鼠高20倍。在缺乏功能性髓过氧化物酶的肺炎克雷伯菌感染小鼠中,3-硝基酪氨酸水平未能增加。我们的观察提供了强有力的证据,证明髓过氧化物酶在体内产生活性氮,并且只有当亚硝酸盐和硝酸盐可用时,它才以这种方式起作用。
Despite intense interest in pathways that generate reactive nitrogen species, the physiologically relevant mechanisms for inflammatory tissue injury remain poorly understood. One possible mediator is myeloperoxidase, a major constituent of neutrophils, monocytes, and some populations of macrophages. The enzyme uses hydrogen peroxide and nitrite to generate 3-nitrotyrosine in vitro. To determine whether myeloperoxidase produces nitrating intermediates in vivo, we used isotope dilution gas chromatography/mass spectrometry to quantify 3-nitrotyrosine in two models of peritoneal inflammation: mice infected with Klebsiella pneumoniae and mice subjected to cecal ligation and puncture. Both models developed an intense neutrophil inflammatory response, and the inflammatory fluid contained markedly elevated levels of 3-chlorotyrosine, a marker of myeloperoxidase action. In striking contrast, 3-nitrotyrosine levels rose only in the mice infected with K. pneumoniae. Levels of total nitrite and nitrate were 20-fold higher in mice injected with K. pneumoniae than in mice subjected to cecal ligation and puncture. Levels of 3-nitrotyrosine failed to increase in mice infected with K. pneumoniae that lacked functional myeloperoxidase. Our observations provide strong evidence that myeloperoxidase generates reactive nitrogen species in vivo and that it operates in this fashion only when nitrite and nitrate become available.
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