The extracellular membrane‐proximal domain of membrane‐bound IgE restricts B cell activation by limiting B cell antigen receptor surface expression

The extracellular membrane‐proximal domain of membrane‐bound IgE restricts B cell activation by limiting B cell antigen receptor surface expression
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膜结合 IgE 的胞外膜近端结构域通过限制 B 细胞抗原受体表面表达来限制 B 细胞活化

DOI:
10.1002/eji.201747196
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发表时间:
2018
影响因子:
5.4
通讯作者:
Engels
Engels
中科院分区:
医学3区
文献类型:
--
作者:
Vanshylla;Gronke;Wienands;Engels

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免疫球蛋白E(IgE)抗体是过敏反应的关键介质。由于其潜在的有害过敏特性,其生产受到严格管制。IgE的膜结合亚型(mIgE)是B细胞抗原受体的组成部分,已被证明对调节小鼠IgE应答至关重要。在包括人类在内的灵长类物种中,mIgE可以通过一级ε IG重链转录物的选择性剪接产生的两种同种型表达,不同之处在于不存在或存在由52个氨基酸组成的细胞外近膜结构域(EMPD)。然而,EMPD的功能仍然不清楚。在此,我们证明EMPD限制了人和鼠B细胞中含mIgE BCR的表面表达。EMPD不干扰BCR组装,但作为一个自主的内质网滞留域。含EMPD的mIgE-BCR的有限表面表达导致细胞内信号级联激活受损,因此代表了可能控制灵长类动物中潜在过敏性IgE抗体产生的调节机制。
Immunoglobulin E (IgE) antibodies are key mediators of allergic reactions. Due to their potentially harmful anaphylactic properties, their production is tightly regulated. The membrane‐bound isoform of IgE (mIgE), which is an integral component of the B cell antigen receptor, has been shown to be critical for the regulation of IgE responses in mice. In primate species including humans, mIgE can be expressed in two isoforms that are produced by alternative splicing of the primary ε Ig heavy chain transcript, and differ in the absence or presence of an extracellular membrane‐proximal domain (EMPD) consisting of 52 amino acids. However, the function of the EMPD remains unclear. Here, we demonstrate that the EMPD restricts surface expression of mIgE‐containing BCRs in human and murine B cells. The EMPD does not interfere with BCR assembly but acts as an autonomous endoplasmic reticulum retention domain. Limited surface expression of EMPD‐containing mIgE‐BCRs caused impaired activation of intracellular signaling cascades and hence represents a regulatory mechanism that may control the production of potentially anaphylactic IgE antibodies in primate species.
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