The origins, specificity, and potential biological relevance of human anti-IgG hinge autoantibodies.

The origins, specificity, and potential biological relevance of human anti-IgG hinge autoantibodies.
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DOI:
10.1100/tsw.2011.107
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发表时间:
2011-05-26
影响因子:
--
通讯作者:
Jordan RE
Jordan RE
中科院分区:
其他
文献类型:
--
作者:
Brezski RJ;Knight DM;Jordan RE

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人抗-Ig G铰链(HAH)自身抗体是一类免疫球蛋白,能识别蛋白质降解后暴露的抗体铰链区域的隐蔽表位,但不与完整的Ig G结合。HAH自身抗体的详细分子特征表明,在某些情况下,它们不同于独立于抗原挑战而产生的自然自身抗体。许多研究试图确定HAH自身抗体的特异性,最初检测到的HAH自身抗体与暴露在IgG上或下铰链区的具有C末端氨基酸残基的片段结合。许多研究人员已经提供了关于HAH自身抗体的亚型分布,以及蛋白酶裂解模式和HAH自身抗体反应性之间的相关性的信息。HAH自身抗体具有多种生物学功能,从房屋清洁功能到免疫抑制作用,再到恢复功能到裂解免疫球蛋白。在这篇综述中,我们讨论了关于HAH自身抗体的起源、特异性和提出的生物学相关性的历史和当前文献。
Human anti-IgG hinge (HAH) autoantibodies constitute a class of immunoglobulins that recognize cryptic epitopes in the hinge region of antibodies exposed after proteolytic cleavage, but do not bind to the intact IgG counterpart. Detailed molecular characterizations of HAH autoantibodies suggest that they are, in some cases, distinct from natural autoantibodies that arise independent of antigenic challenge. Multiple studies have attempted to define the specificity of HAH autoantibodies, which were originally detected as binding to fragments possessing C-terminal amino acid residues exposed in either the upper or lower hinge regions of IgGs. Numerous investigators have provided information on the isotype profiles of the HAH autoantibodies, as well as correlations among protease cleavage patterns and HAH autoantibody reactivity. Several biological functions have been attributed to HAH autoantibodies, ranging from house-cleaning functions to an immunosuppressive role to restoring function to cleaved IgGs. In this review, we discuss both the historic and current literature regarding HAH autoantibodies in terms of their origins, specificity, and proposed biological relevance.
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