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Author:
Date:
2020-11-05
[Abstract] Supramolecular signaling assemblies are of interest for their unique signaling properties. A µm scale signaling assembly, the central supramolecular signaling cluster (cSMAC), forms at the center interface of T cells activated by antigen presenting cells (APC). The adaptor protein linker for activation of T cells (LAT) is a key cSMAC component. The cSMAC has widely been studied using total internal reflection fluorescence microscopy of CD4+ T cells activated by planar APC substitutes. Here we provide a protocol to image the cSMAC in its cellular context at the interface between a T cell and an APC. Super resolution stimulated emission depletion microscopy (STED) was utilized to determine the localization of LAT, that of its active, phosphorylated form and its entire pool. Agonist ...
[摘要] [摘要]超分子信号组装体因其独特的信号传导特性而受到关注。在抗原呈递细胞（APC）激活的T细胞的中心界面处形成一个微米级的信号传导组件，即中央超分子信号簇（cSMAC ）。用于激活T细胞（LAT）的衔接子蛋白接头是关键的cSMAC组件。所述CSMAC已被广泛使用的CD4全内反射荧光显微镜研究+由平面APC替代活化的T细胞。在这里，我们提供了一种协议，可以在T细胞和APC之间的接口在其细胞上下文中成像cSMAC 。超分辨率激发发射耗尽显微镜（STED）用于确定LA T的定位，其活性，磷酸化形式及其整个池的位置。在固定和抗体染色之前，将载有激动剂肽的APC与TCR转基因CD4 + T细胞孵育4.5分钟。固定的细胞对在Leica SP8 AOBS共聚焦激光扫描显微镜上使用100x 1.4 NA物镜成像。LAT聚集在多个超分子复合物中，并确定了它们的数量和大小分布。使用此协议，可以量化在T细胞和APC之间的界面在其细胞环境中的cSMAC属性。
[背景] ...
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