Functional anergy in a subpopulation of naive B cells from healthy humans that express autoreactive immunoglobulin receptors.

Functional anergy in a subpopulation of naive B cells from healthy humans that express autoreactive immunoglobulin receptors.
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DOI:
10.1084/jem.20080611
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发表时间:
2009-01-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wilson PC
Wilson PC
中科院分区:
其他
文献类型:
--
作者:
Duty JA;Szodoray P;Zheng NY;Koelsch KA;Zhang Q;Swiatkowski M;Mathias M;Garman L;Helms C;Nakken B;Smith K;Farris AD;Wilson PC

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不受受体编辑或克隆缺失控制的自身反应性B细胞可能变得无能。我们报告了完全成熟的人B细胞表面IgM阴性,仅保留IgD,是自身反应性的,功能减弱(称为幼稚IgD+IgM− B细胞[BND])。这些BND细胞通常占外周血中B细胞的2.5%,具有种系(未突变的)构型的抗体可变区基因,并且通过所有目前的测量,是完全成熟的。对从单个BND细胞的可变基因表达的95种重组抗体的分析表明,它们主要是自身反应性的,与HEp-2细胞抗原和DNA结合。在B细胞受体交联后,BND细胞动员细胞内钙或磷酸化酪氨酸的能力降低,表明它们是无反应性的。然而,强烈的刺激会导致BND细胞完全反应,这表明这些细胞可能是自身免疫性疾病(如系统性红斑狼疮或类风湿性关节炎)中分泌自身抗体的浆细胞的前体。这是第一次鉴定出一种独特的成熟人类B细胞亚群,该亚群是天然自身反应性的,并由功能性无反应性的耐受机制控制。
Self-reactive B cells not controlled by receptor editing or clonal deletion may become anergic. We report that fully mature human B cells negative for surface IgM and retaining only IgD are autoreactive and functionally attenuated (referred to as naive IgD+IgM− B cells [BND]). These BND cells typically make up 2.5% of B cells in the peripheral blood, have antibody variable region genes in germline (unmutated) configuration, and, by all current measures, are fully mature. Analysis of 95 recombinant antibodies expressed from the variable genes of single BND cells demonstrated that they are predominantly autoreactive, binding to HEp-2 cell antigens and DNA. Upon B cell receptor cross-linkage, BND cells have a reduced capacity to mobilize intracellular calcium or phosphorylate tyrosines, demonstrating that they are anergic. However, intense stimulation causes BND cells to fully respond, suggesting that these cells could be the precursors of autoantibody secreting plasma cells in autoimmune diseases such as systemic lupus erythematosus or rheumatoid arthritis. This is the first identification of a distinct mature human B cell subset that is naturally autoreactive and controlled by the tolerizing mechanism of functional anergy.
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