NETosis as Source of Autoantigens in Rheumatoid Arthritis.

NETosis as Source of Autoantigens in Rheumatoid Arthritis.
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Netosis作​​为类风湿关节炎中自身抗原的来源。

DOI:
10.3389/fimmu.2016.00485
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发表时间:
2016
影响因子:
7.3
通讯作者:
Migliorini P
Migliorini P
中科院分区:
医学2区
文献类型:
--
作者:
Corsiero E;Pratesi F;Prediletto E;Bombardieri M;Migliorini P

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在嗜中性粒细胞中(嗜酸性粒细胞和肥大细胞中也是如此),不同的炎症刺激诱导组蛋白脱亚氨基化、染色质去浓缩和NET形成。这些捕获和杀死微生物的网状结构包含DNA,阳离子颗粒蛋白和抗菌肽,但最丰富的蛋白质是核心组蛋白。NET中所含的组蛋白已被脱亚胺化,而精氨酸被转化为瓜氨酸。虽然脱亚氨基化是一个在炎症条件下放大的生理过程,但只有携带遗传易感性的个体才能发展为类风湿性关节炎(RA),从而产生脱亚氨基蛋白的抗体。这些抗体统称为抗瓜氨酸化蛋白/肽抗体(ACPA),与不同的脱亚氨基蛋白反应,并显示部分重叠的特异性。在本文中,我们将总结目前的证据支持NETosis的作用,作为关键机制,在突破耐受性自身抗原,并支持自身反应细胞的扩增和分化。事实上,有几条证据将NETosis与RA联系起来:RA未刺激的滑液中性粒细胞显示出增强的NETosis;来自患有弗氏综合征的RA患者的血清结合脱亚胺化的H3和NET;大量RA血清结合NET中含有的脱亚胺化的H4;由RA滑膜B细胞产生的人单克隆抗体修饰NET并结合脱亚胺化的组蛋白。在RA中,NET一方面代表携带翻译后修饰并促进ACPA产生的自身抗原的重要来源。另一方面,NET传递维持炎症环境的信号,并有助于产生ACPA的B细胞的扩增和分化。
In neutrophils (but also in eosinophils and in mast cells), different inflammatory stimuli induce histone deimination, chromatin decondensation, and NET formation. These web-like structures that trap and kill microbes contain DNA, cationic granule proteins, and antimicrobial peptides, but the most abundant proteins are core histones. Histones contained in NETs have been deiminated, and arginines are converted in citrullines. While deimination is a physiological process amplified in inflammatory conditions, only individuals carrying genetic predisposition to develop rheumatoid arthritis (RA) make antibodies to deiminated proteins. These antibodies, collectively identified as anti-citrullinated proteins/peptides antibodies (ACPA), react with different deiminated proteins and display partially overlapping specificities. In this paper, we will summarize current evidence supporting the role of NETosis as critical mechanism in the breach of tolerance to self-antigens and in supporting expansion and differentiation of autoreactive cells. In fact, several lines of evidence connect NETosis with RA: RA unstimulated synovial fluid neutrophils display enhanced NETosis; sera from RA patients with Felty’s syndrome bind deiminated H3 and NETs; a high number of RA sera bind deiminated H4 contained in NETs; human monoclonal antibodies generated from RA synovial B cells decorate NETs and bind deiminated histones. In RA, NETs represent on one side an important source of autoantigens bearing posttranslational modifications and fueling the production of ACPA. On the other side, NETs deliver signals that maintain an inflammatory milieu and contribute to the expansion and differentiation of ACPA-producing B cells.
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发表时间: 2013-04-01
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