Membrane heterogeneities in the formation of B cell receptor-Lyn kinase microclusters and the immune synapse.

Membrane heterogeneities in the formation of B cell receptor-Lyn kinase microclusters and the immune synapse.
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DOI:
10.1083/jcb.200802007
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发表时间:
2008-07-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Pierce SK
Pierce SK
中科院分区:
其他
文献类型:
--
作者:
Sohn HW;Tolar P;Pierce SK

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抗原与 B 细胞受体 (BCR) 结合可诱导 BCR 聚集、Src 家族激酶 Lyn 对 BCR 进行磷酸化、信号传导的启动以及免疫突触的形成。我们使用活细胞高分辨率全内反射荧光显微镜结合荧光共振能量转移研究了 B 细胞首次遇到膜上的抗原。新形成的 BCR 微簇扰乱局部膜微环境,导致与脂筏探针结合。该早期事件是 BCR 固有的并且独立于 BCR 信号传导。 BCR 微簇与膜束缚 Lyn 的关联取决于 Lyn 活性,并随着微簇积累并形成免疫突触而持续存在。膜扰动和 BCR-Lyn 关联在时间和空间上与微簇 BCR 从“封闭”到“开放”活性信号传导构象的转变相关。 BCR 信号传导中最早事件的可视化和分析强调了膜微环境对于 BCR-Lyn 复合物和 B 细胞免疫突触形成的重要性。
Antigen binding to the B cell receptors (BCRs) induces BCR clustering, phosphorylation of BCRs by the Src family kinase Lyn, initiation of signaling, and formation of an immune synapse. We investigated B cells as they first encountered antigen on a membrane using live cell high resolution total internal reflection fluorescence microscopy in conjunction with fluorescence resonance energy transfer. Newly formed BCR microclusters perturb the local membrane microenvironment, leading to association with a lipid raft probe. This early event is BCR intrinsic and independent of BCR signaling. Association of BCR microclusters with membrane-tethered Lyn depends on Lyn activity and persists as microclusters accumulate and form an immune synapse. Membrane perturbation and BCR–Lyn association correlate both temporally and spatially with the transition of microclustered BCRs from a “closed” to an “open” active signaling conformation. Visualization and analysis of the earliest events in BCR signaling highlight the importance of the membrane microenvironment for formation of BCR–Lyn complexes and the B cell immune synapse.
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