The Transcription Factor AP4 Mediates Resolution of Chronic Viral Infection through Amplification of Germinal Center B Cell Responses.

The Transcription Factor AP4 Mediates Resolution of Chronic Viral Infection through Amplification of Germinal Center B Cell Responses.
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转录因子AP4通过扩增生发中心B细胞反应来介导慢性病毒感染的分辨率。

DOI:
10.1016/j.immuni.2016.07.023
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发表时间:
2016-09-20
期刊:
影响因子:
32.4
通讯作者:
Egawa, Takeshi
Egawa, Takeshi
中科院分区:
医学1区
文献类型:
--
作者:
Chou, Chun;Verbaro, Daniel J.;Tonc, Elena;Holmgren, Melanie;Cella, Marina;Colonna, Marco;Bhattacharya, Deepta;Egawa, Takeshi

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B细胞在生发中心(GC)使其抗原受体库多样化并亲和力成熟。GC B细胞在与T细胞的短暂相互作用期间接收帮助信号,但仍然不知道亮区中的这些短暂的T-B相互作用如何维持在解剖学上遥远的暗区中发生的所选B细胞的随后增殖程序。在这里,我们表明,转录因子AP 4所需的持续GC B细胞增殖和随后建立一个多样化的和保护性的抗体库。在T-B相互作用期间,AP 4由c-MYC诱导,由T细胞衍生的白细胞介素-21(IL-21)维持,并促进所选择的GC B细胞的重复轮分裂。AP 4的B细胞特异性缺失导致GC大小减小和体细胞超突变减少,同时未能控制慢性病毒感染。这些结果表明,AP 4整合了T细胞介导的选择和GC B细胞的持续扩增以用于体液免疫。
B cells diversify and affinity-mature their antigen receptor repertoire in germinal centers (GC). GC B cells receive help signals during transient interaction with T cells, yet it remains unknown how these transient T-B interactions in the light zone sustain the subsequent proliferative program of selected B cells that occurs in the anatomically distant dark zone. Here we show that the transcription factor AP4 was required for sustained GC B cell proliferation and subsequent establishment of a diverse and protective antibody repertoire. AP4 was induced by c-MYC during the T-B interactions, maintained by T cell-derived interleukin-21 (IL-21) and promoted repeated rounds of divisions of selected GC B cells. B cell-specific deletion of AP4 resulted in reduced GC sizes and reduced somatic hypermutation coupled with a failure to control chronic viral infection. These results indicate that AP4 integrates T cell-mediated selection and sustained expansion of GC B cells for humoral immunity.
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发表时间: 2012
期刊: PloS one
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