Cutting Edge: A Threshold of B Cell Costimulatory Signals Is Required for Spontaneous Germinal Center Formation in Autoimmunity.

Cutting Edge: A Threshold of B Cell Costimulatory Signals Is Required for Spontaneous Germinal Center Formation in Autoimmunity.
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DOI:
10.4049/jimmunol.2100548
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发表时间:
2021-11-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Jackson SW
Jackson SW
中科院分区:
其他
文献类型:
--
作者:
Chiang K;Largent AD;Arkatkar T;Thouvenel CD;Du SW;Shumlak N;Woods J;Li QZ;Liu Y;Hou B;Rawlings DJ;Jackson SW

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自身反应性 B 细胞和 T 细胞之间的同源相互作用尤其通过促进自发生发中心 (GC) 形成来促进系统性红斑狼疮 (SLE) 发病机制。尽管骨髓细胞和 B 细胞抗原呈递细胞 (APC) 均表达 B7 配体(CD80 和 CD86),但主流模型认为树突细胞 (DC) 共刺激足以激活 CD28 依赖性 T 细胞。在此,我们报告 B 细胞固有的 CD80/CD86 缺失意外地消除了小鼠狼疮中的 GC。有趣的是,GC 的缺失对血清自身抗体 (autoAb) 的影响存在差异。与驱动狼疮 autoAb 的不同滤泡外 (EF) 和 GC 激活途径一致,GC 的缺乏与 RNA 相关 autoAb 的丧失相关,但保留了抗 dsDNA 和结缔组织 autoAb 滴度。引人注目的是,即使杂合 B 细胞 CD80/CD86 缺失也足以预防自身免疫性 GC 和 RNA 相关的自身抗体。总之,这些发现确定了 B 细胞通过提供自身反应性 T 细胞激活所需的共刺激信号阈值来促进狼疮发病的关键机制。
Cognate interactions between autoreactive B and T cells promote systemic lupus erythematosus (SLE) pathogenesis by, inter alia, facilitating spontaneous germinal center (GC) formation. Whereas both myeloid and B cell antigen presenting cells (APCs) express B7 ligands (CD80 and CD86), the prevailing model holds that dendritic cell (DC) costimulation is sufficient for CD28-dependent T cell activation. Here, we report that B cell-intrinsic CD80/CD86 deletion unexpectedly abrogates GCs in murine lupus. Interestingly, absent GCs differentially impacted serum autoantibodies (autoAb). In keeping with distinct extra-follicular (EF) and GC activation pathways driving lupus autoAb, lack of GCs correlated with loss of RNA-associated autoAb but preserved anti-dsDNA and connective tissue autoAb titers. Strikingly, even heterozygous B cell CD80/CD86 deletion was sufficient to prevent autoimmune GCs and RNA-associated autoAb. Together, these findings identify a key mechanism whereby B cells promote lupus pathogenesis, by providing a threshold of costimulatory signals required for autoreactive T cell activation.
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