Cutting Edge: Ezrin Regulates Inflammation by Limiting B Cell IL-10 Production.

Cutting Edge: Ezrin Regulates Inflammation by Limiting B Cell IL-10 Production.
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DOI:
10.4049/jimmunol.1502098
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发表时间:
2016-01-15
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;Matsui K;Parameswaran N;Gupta N

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B 细胞产生的白细胞介素 10 (IL-10) 对于控制炎症非常重要,因此强调需要确定调节其产生的机制。在这里,我们证明 B 细胞中 ezrin 的条件性缺失会增加 TLR4 连接诱导的 IL-10 的产生。 Ezrin 缺陷的 B 细胞需要不依赖 MyD88 的 TRIF-IRF3 途径才能在 LPS 刺激下产生更高的 IL-10。用新型埃兹蛋白小分子抑制剂处理 B 细胞会诱导其去磷酸化,并增加 LPS 诱导的 NF-κB 和 IRF3 激活以及 IL-10 分泌,表明埃兹蛋白 Thr567 磷酸化在限制 IL-10 中发挥作用。 B 细胞中埃兹蛋白的丢失会导致体内对亚致死剂量的 LPS 的促炎反应减弱,这取决于 IL-10 产量的增加。总而言之,我们的数据对 B 细胞 IL-10 产生的分子和膜细胞骨架调节产生了新的见解,并揭示了埃兹蛋白作为炎症性疾病的潜在治疗靶点。
Interleukin 10 (IL-10) produced by B cells is important for controlling inflammation, thus underscoring the need to identify mechanisms regulating its production. Here, we demonstrate that conditional deletion of ezrin in B cells increases IL-10 production induced by TLR4 ligation. The MyD88-independent TRIF-IRF3 pathway is required for Ezrin-deficient B cells to produce higher IL-10 upon LPS stimulation. Treatment of B cells with a novel small molecule inhibitor of ezrin induces its dephosphorylation, and increases LPS-induced NF-κB and IRF3 activation and IL-10 secretion, indicating a role for Thr567 phosphorylation of ezrin in limiting IL-10. Loss of ezrin in B cells results in dampened pro-inflammatory response to a sub-lethal dose of LPS in vivo, which is dependent on increased IL-10 production. Taken together, our data yield new insights into molecular and membrane-cytoskeletal regulation of B cell IL-10 production, and reveal ezrin as a potential therapeutic target in inflammatory diseases.