Ezrin tunes the magnitude of humoral immunity.

Ezrin tunes the magnitude of humoral immunity.
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DOI:
10.4049/jimmunol.1301315
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发表时间:
2013-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Gupta N
Gupta N
中科院分区:
其他
文献类型:
--
作者:
Pore D;Parameswaran N;Matsui K;Stone MB;Saotome I;McClatchey AI;Veatch SL;Gupta N

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Ezrin是参与多种细胞过程的膜肌动蛋白细胞骨架交联剂的Ezrin-Radixin-Moesin(ERM)家族的成员。在B细胞中,ezrin在不同位点的磷酸化调节多个过程,如脂筏聚结、BCR扩散、微簇集和内体JNK活化。在这项研究中,我们产生了小鼠与条件删除ezrin的B细胞谱系,调查的生理意义ezrin的功能,在抗原受体介导的B细胞活化和体液免疫。B细胞发育以及外周淋巴器官中主要B细胞亚群的比例和数量不受埃兹蛋白丢失的影响。使用超分辨率成像方法,我们表明,在埃兹蛋白的情况下,BCR通过积累成更大,更稳定的信号微簇对抗原结合作出反应。埃兹蛋白的丢失导致延迟的BCR帽和加速脂筏聚结。虽然近端信号传导蛋白在埃兹蛋白不存在下显示出更强的激活,但远端BCR信号传导组分的组分显示出不同的作用。Ezrin缺陷导致体外B细胞增殖和分化为抗体分泌细胞增加,体内对抗原的T细胞非依赖性和依赖性应答更强。总的来说,我们的数据表明,埃兹蛋白调节BCR信号的放大,并调整B细胞活化和体液免疫的强度。
Ezrin is a member of the Ezrin-Radixin-Moesin (ERM) family of membrane-actin cytoskeleton crosslinkers that participate in a variety of cellular processes. In B cells, phosphorylation of ezrin at different sites regulates multiple processes such as lipid raft coalescence, BCR diffusion, microclustering, and endosomal JNK activation. In this study, we generated mice with conditional deletion of ezrin in the B cell lineage to investigate the physiological significance of ezrin’s function in antigen receptor-mediated B cell activation and humoral immunity. B cell development, as well as the proportion and numbers of major B cell subsets in peripheral lymphoid organs were unaffected by the loss of ezrin. Using super resolution imaging methods we show that in the absence of ezrin, BCRs respond to antigen binding by accumulating into larger and more stable signaling microclusters. Loss of ezrin led to delayed BCR capping and accelerated lipid raft coalescence. While proximal signaling proteins showed stronger activation in the absence of ezrin, components of the distal BCR signaling components displayed distinct effects. Ezrin deficiency resulted in increased B cell proliferation and differentiation into antibody-secreting cells ex vivo, and stronger T cell-independent and -dependent responses to antigen in vivo. Overall, our data demonstrate that ezrin regulates amplification of BCR signals and tunes the strength of B cell activation and humoral immunity.
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期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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