The dendritic cell cytoskeleton promotes T cell adhesion and activation by constraining ICAM-1 mobility.

The dendritic cell cytoskeleton promotes T cell adhesion and activation by constraining ICAM-1 mobility.
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DOI:
10.1083/jcb.201406120
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发表时间:
2015-02-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Burkhardt JK
Burkhardt JK
中科院分区:
其他
文献类型:
--
作者:
Comrie WA;Li S;Boyle S;Burkhardt JK

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肌动蛋白结合蛋白moesin和α-actinin-1限制ICAM-1在树突状细胞中的侧向移动和聚集,从而促进抗原依赖性缀合物形成和T细胞引发。树突状细胞(DC)肌动蛋白细胞骨架的完整性对于T细胞引发是必不可少的,但其潜在机制知之甚少。我们发现,直流F-肌动蛋白网络调节细胞内细胞粘附分子1(ICAM-1)的横向流动性,但不是MHCII。ICAM-1的移动性和聚集性受成熟诱导的膜突蛋白和α-辅肌动蛋白-1的表达和活化变化的调节,膜突蛋白和α-辅肌动蛋白-1与肌动蛋白丝和ICAM-1胞质结构域相关。受约束的ICAM-1迁移率对于DC功能是重要的,因为表达缺乏胞质结构域的高迁移率ICAM-1突变体的DC表现出减少的抗原依赖性缀合物形成和T细胞引发。这些缺陷与白细胞功能性抗原1(LFA-1)亲和力成熟的低效诱导相关,这与其中受约束的ICAM-1移动性对抗T细胞细胞骨架施加于LFA-1的力的模型一致,而ICAM-1聚集增强效价并进一步促进配体依赖性LFA-1活化。我们的研究结果揭示了一个重要的新机制,通过DC细胞骨架调节受体激活的免疫突触。
The actin-binding proteins moesin and α-actinin-1 limit the lateral mobility and clustering of ICAM-1 in dendritic cells and thereby promote antigen-dependent conjugate formation and T cell priming. Integrity of the dendritic cell (DC) actin cytoskeleton is essential for T cell priming, but the underlying mechanisms are poorly understood. We show that the DC F-actin network regulates the lateral mobility of intracellular cell adhesion molecule 1 (ICAM-1), but not MHCII. ICAM-1 mobility and clustering are regulated by maturation-induced changes in the expression and activation of moesin and α-actinin-1, which associate with actin filaments and the ICAM-1 cytoplasmic domain. Constrained ICAM-1 mobility is important for DC function, as DCs expressing a high-mobility ICAM-1 mutant lacking the cytoplasmic domain exhibit diminished antigen-dependent conjugate formation and T cell priming. These defects are associated with inefficient induction of leukocyte functional antigen 1 (LFA-1) affinity maturation, which is consistent with a model in which constrained ICAM-1 mobility opposes forces on LFA-1 exerted by the T cell cytoskeleton, whereas ICAM-1 clustering enhances valency and further promotes ligand-dependent LFA-1 activation. Our results reveal an important new mechanism through which the DC cytoskeleton regulates receptor activation at the immunological synapse.
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