Uhrf1 regulates germinal center B cell expansion and affinity maturation to control viral infection.

Uhrf1 regulates germinal center B cell expansion and affinity maturation to control viral infection.
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Uhrf1 调节生发中心 B 细胞扩增和亲和力成熟以控制病毒感染。

DOI:
10.1084/jem.20171815
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发表时间:
2018-05-07
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wang X
Wang X
中科院分区:
其他
文献类型:
--
作者:
Chen C;Zhai S;Zhang L;Chen J;Long X;Qin J;Li J;Huo R;Wang X

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高亲和力抗体的产生是病原体清除的关键。抗体亲和力的提高是通过生发中心(GC)亲和力的成熟,这依赖于BCR体细胞超突变(SHM)和基于抗原的选择。GC B细胞的增殖本质上参与了这些过程;它为SHM提供了足够的模板,也是阳性选择的关键机制。在这项研究中,我们发现c-Myc-AP4显著上调了GC B细胞中带有PhD和环指结构域1(Uhrf1)的表观遗传调节素样基因(Uhrf1)的表达,这是GC反应所必需的。Uhrf1通过甲基化调控CDKN1a、sLfn1和sLfn2等细胞增殖相关基因,其缺失抑制了GC B细胞周期于G1-S期。随后,gC B细胞SHM和亲和力成熟受损,uhrf1 gc B基因敲除小鼠无法控制慢性病毒感染。总之,我们的数据表明,uhrf1调节GC B细胞的增殖和亲和力成熟,它在GC B细胞中的表达是清除病毒所必需的。
The production of high-affinity antibody is essential for pathogen clearance. Antibody affinity is increased through germinal center (GC) affinity maturation, which relies on BCR somatic hypermutation (SHM) followed by antigen-based selection. GC B cell proliferation is essentially involved in these processes; it provides enough templates for SHM and also serves as a critical mechanism of positive selection. In this study, we show that expression of epigenetic regulator ubiquitin-like with PHD and RING finger domains 1 (Uhrf1) was markedly up-regulated by c-Myc–AP4 in GC B cells, and it was required for GC response. Uhrf1 regulates cell proliferation–associated genes including cdkn1a, slfn1, and slfn2 by DNA methylation, and its deficiency inhibited the GC B cell cycle at G1-S phase. Subsequently, GC B cell SHM and affinity maturation were impaired, and Uhrf1 GC B knockout mice were unable to control chronic virus infection. Collectively, our data suggest that Uhrf1 regulates GC B cell proliferation and affinity maturation, and its expression in GC B cells is required for virus clearance.
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