Cutting edge: cell surface linker for activation of T cells is recruited to microclusters and is active in signaling.

Cutting edge: cell surface linker for activation of T cells is recruited to microclusters and is active in signaling.
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DOI:
10.4049/jimmunol.1202760
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发表时间:
2013-04-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Samelson LE
Samelson LE
中科院分区:
其他
文献类型:
--
作者:
Balagopalan L;Barr VA;Kortum RL;Park AK;Samelson LE

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最近出现了关于参与T细胞抗原受体(TCR)下游信号传播的适配器LAT的细胞池位置的争议。在一种模型中,细胞表面LAT的磷酸化和直接募集对激活诱导的微团簇对T细胞激活至关重要,而在另一种模型中,LAT参与这些过程,而不是表面。通过使用可以通过细胞外结构域跟踪的嵌合版本LAT,我们提供了证据,证明位于细胞表面的LAT可以在TCR接合的几秒钟内有效地招募到激活诱导的微团簇。重要的是,我们还证明了质膜上的LAT池被迅速磷酸化。我们的结果为细胞利用细胞表面的LAT对TCR刺激进行快速反应的模型提供了支持。
A controversy has recently emerged regarding the location of the cellular pool of the adapter LAT that participates in propagation of signals downstream of the T Cell Antigen Receptor (TCR). In one model phosphorylation and direct recruitment of cell surface LAT to activation-induced microclusters is critical for T cell activation, while in the other model vesicular, but not surface, LAT participates in these processes. By using a chimeric version of LAT which can be tracked via an extracellular domain, we provide evidence that LAT located at the cell surface can be recruited efficiently to activation-induced microclusters within seconds of TCR engagement. Importantly, we also demonstrate that this pool of LAT at the plasma membrane is rapidly phosphorylated. Our results provide support for the model in which the cell utilizes LAT from the cell surface for rapid responses to TCR stimulation.
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