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The structure, specificity and function of anti-citrullinated protein antibodies.
Nature Reviews Rheumatology ( IF 29.4 ) Pub Date : 2019-06-28 , DOI: 10.1038/s41584-019-0244-4
Changrong Ge 1 , Rikard Holmdahl 1
Affiliation  

In this Perspectives article, we outline a proposed model for understanding the specificity and function of anti-citrullinated protein antibodies (ACPAs). We suggest that ACPAs vary in specificity between two extremes: some are 'promiscuous' in that they are highly specific for the citrulline side chain, but cross-react with a range of citrullinated peptides, whereas others are 'private' in that their recognition of citrulline as well as proximal amino acid side chains enables protein-specific interactions. Promiscuous ACPAs tend to dominate in the sera both before and after the onset of rheumatoid arthritis, but their functional role has not been clarified. No firm evidence exists that these ACPAs are pathogenic. By contrast, private ACPAs encompass antibodies that specifically recognize citrullinated epitopes on joint proteins or that cross-react with joint proteins, thereby opening up the possibility that these private ACPAs are arthritogenic. These joint-reactive antibodies are more likely to target joints by binding to joint tissues and to promote the formation of local immune complexes leading to bone erosions, pain and arthritis.

中文翻译:


抗瓜氨酸蛋白抗体的结构、特异性和功能。



在这篇 Perspectives 文章中,我们概述了一个拟议的模型,用于理解抗瓜氨酸蛋白抗体 (ACPAs) 的特异性和功能。我们认为 ACPA 在两个极端之间的特异性存在差异:一些是“混杂的”,因为它们对瓜氨酸侧链具有高度特异性,但与一系列瓜氨酸化肽发生交叉反应,而另一些是“私有的”,因为它们对瓜氨酸和近端氨基酸侧链的识别能够实现蛋白质特异性相互作用。混杂的 ACPA 往往在类风湿性关节炎发作前后的血清中占主导地位,但它们的功能作用尚未阐明。没有确凿的证据表明这些 ACPA 具有致病性。相比之下,私有 ACPA 包含特异性识别关节蛋白上瓜氨酸化表位或与关节蛋白发生交叉反应的抗体,从而打开了这些私有 ACPA 是致关节炎的可能性。这些关节反应性抗体更有可能通过与关节组织结合来靶向关节,并促进局部免疫复合物的形成,从而导致骨侵蚀、疼痛和关节炎。
更新日期:2019-06-29
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