Induction of Short NFATc1/αA Isoform Interferes with Peripheral B Cell Differentiation.

Induction of Short NFATc1/αA Isoform Interferes with Peripheral B Cell Differentiation.
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诱导短NFATC1/αA同工型会干扰周围B细胞分化。

DOI:
10.3389/fimmu.2018.00032
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发表时间:
2018
影响因子:
7.3
通讯作者:
Serfling E
Serfling E
中科院分区:
医学2区
文献类型:
--
作者:
Muhammad K;Rudolf R;Pham DAT;Klein-Hessling S;Takata K;Matsushita N;Ellenrieder V;Kondo E;Serfling E

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在淋巴细胞中,免疫受体信号诱导预先形成的胞质 NFAT 蛋白快速核转位。与共刺激信号一起,持续的免疫受体信号导致效应淋巴细胞中 NFATc1/αA(一种短 NFATc1 亚型)的高水平。尽管 NFATc1 在浆细胞中不表达,但在生发中心,许多中心细胞 B 细胞表达核 NFATc1/αA。当在鸡 DT40 B 细胞或鼠 WEHI 231 B 细胞中过度表达时,NFATc1/αA 抑制 B 细胞受体信号诱导的细胞死亡,并影响控制生发中心反应和浆细胞形成的基因表达。其中包括编码 Blimp-1 的 Prdm1 基因,Blimp-1 是浆细胞形成的关键因子。通过与 Prdm1 基因外显子 1 内的调节 DNA 元件结合,NFATc1/αA 抑制 Blimp-1 表达。由于 NFATc1/αA 的组成型活性版本的表达会干扰 Prdm1 RNA 表达、体外 LPS 介导的脾 B 细胞向浆母细胞的分化以及体内免疫球蛋白产量的减少,因此可以得出结论,NFATc1/αA 在控制浆母细胞/浆细胞形成中发挥着重要作用。
In lymphocytes, immune receptor signals induce the rapid nuclear translocation of preformed cytosolic NFAT proteins. Along with co-stimulatory signals, persistent immune receptor signals lead to high levels of NFATc1/αA, a short NFATc1 isoform, in effector lymphocytes. Whereas NFATc1 is not expressed in plasma cells, in germinal centers numerous centrocytic B cells express nuclear NFATc1/αA. When overexpressed in chicken DT40 B cells or murine WEHI 231 B cells, NFATc1/αA suppressed their cell death induced by B cell receptor signals and affected the expression of genes controlling the germinal center reaction and plasma cell formation. Among those is the Prdm1 gene encoding Blimp-1, a key factor of plasma cell formation. By binding to a regulatory DNA element within exon 1 of the Prdm1 gene, NFATc1/αA suppresses Blimp-1 expression. Since expression of a constitutive active version of NFATc1/αA interfered with Prdm1 RNA expression, LPS-mediated differentiation of splenic B cells to plasmablasts in vitro and reduced immunoglobulin production in vivo, one may conclude that NFATc1/αA plays an important role in controlling plasmablast/plasma cell formation.
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