Regulation of age-associated B cells by IRF5 in systemic autoimmunity.

Regulation of age-associated B cells by IRF5 in systemic autoimmunity.
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DOI:
10.1038/s41590-018-0056-8
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发表时间:
2018-04
期刊:
影响因子:
30.5
通讯作者:
Pernis AB
Pernis AB
中科院分区:
医学1区
文献类型:
--
作者:
Manni M;Gupta S;Ricker E;Chinenov Y;Park SH;Shi M;Pannellini T;Jessberger R;Ivashkiv LB;Pernis AB

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年龄相关B细胞(ABC)是T细胞依赖的B细胞亚群,在自身免疫环境中过早积累。在自身免疫中调控ABC的途径在很大程度上是未知的。SWET-70和DEF6(也称为IBP或SLAT)是SWEF家族中仅有的两个成员,SWEF家族是一个独特的Rho GTP酶调节蛋白家族,控制细胞骨架动力学和IRF4活性。值得注意的是,DEF6是一种新发现的人类系统性红斑狼疮风险变体。在这里,我们展示了狼疮综合征的发展,在SWEF缺陷的小鼠伴随着ABC的积累,这些细胞在刺激时产生自身抗体。来自SWEF缺陷小鼠的ABC表现出独特的转录组和独特的染色质景观,其特征是丰富了IRF家族、AP-1/BATF和T-bet转录因子结合的基序。白介素21(IL-21)和IRF5控制了SWEF缺陷小鼠增强的ABC形成,它们的变异体与狼疮密切相关。SWEF蛋白的缺失导致IRF5活性失调,以响应IL-21的刺激。因此,这些研究揭示了在自身免疫中控制ABC的一条新的遗传途径。
Age-associated B cells (ABCs) are a T-bet–dependent B cell subset, which accumulates prematurely in autoimmune settings. The pathways regulating ABCs in autoimmunity are largely unknown. SWAP-70 and DEF6 (also known as IBP or SLAT) are the only two members of the SWEF family, a unique family of Rho GTPase-regulatory proteins that controls both cytoskeletal dynamics and IRF4 activity. Notably, DEF6 is a newly identified human SLE-risk variant. Here we show that the lupus syndrome that developed in SWEF-deficient mice is accompanied by the accumulation of ABCs, which produce autoantibodies upon stimulation. ABCs from SWEF-deficient mice exhibited a distinctive transcriptome and a unique chromatin landscape characterized by enrichment in motifs bound by transcription factors of the IRF family, AP-1/BATF, and T-bet. Enhanced ABC formation in SWEF-deficient mice was controlled by interleukin 21 (IL-21) and IRF5, whose variants are strongly associated with lupus. The lack of SWEF proteins led to dysregulated IRF5 activity in response to IL-21 stimulation. These studies thus uncover a new genetic pathway controlling ABCs in autoimmunity.
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