The role of actin and myosin in antigen extraction by B lymphocytes.

The role of actin and myosin in antigen extraction by B lymphocytes.
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肌动蛋白和肌球蛋白在B淋巴细胞提取抗原中的作用。

DOI:
10.1016/j.semcdb.2019.10.017
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发表时间:
2020-06
影响因子:
7.3
通讯作者:
Hammer JA
Hammer JA
中科院分区:
生物学2区
文献类型:
--
作者:
Wang JC;Hammer JA

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B细胞必须提取附着在抗原呈递细胞表面的抗原以产生高亲和力抗体。抗原提取需要力,最近的研究表明,B细胞内产生的肌动球蛋白依赖性拉力是抗原提取的主要驱动力。这些肌动球蛋白依赖性拉力也用于在抗原提取之前测试B细胞抗原受体对抗原的亲和力。这种亲和力辨别是抗体亲和力成熟过程的核心。在这里,我们审查的证据,肌动球蛋白依赖的拉力产生的B细胞内促进亲和力歧视和电源抗原提取。我们对这些关键的B细胞功能的看法受到最近在T细胞免疫突触内侧部分发现的形成蛋白产生的、富含肌球蛋白的同心肌动蛋白弧的显著影响,因为B细胞似乎含有类似的收缩性肌动球蛋白结构。
B cells must extract antigens attached to the surface of antigen presenting cells to generate high-affinity antibodies. Antigen extraction requires force, and recent studies have implicated actomyosin-dependent pulling forces generated within the B cell as the major driver of antigen extraction. These actomyosin-dependent pulling forces also serve to test the affinity of the B cell antigen receptor for antigen prior to antigen extraction. Such affinity discrimination is central to the process of antibody affinity maturation. Here we review the evidence that actomyosin-dependent pulling forces generated within the B cell promote affinity discrimination and power antigen extraction. Our take on these critical B cell functions is influenced significantly by the recent identification of formin-generated, myosin-rich, concentric actin arcs in the medial portion of the T cell immune synapse, as B cells appear to contain a similar contractile actomyosin structure.
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