CD45 pre-exclusion from the tips of T cell microvilli prior to antigen recognition.

CD45 pre-exclusion from the tips of T cell microvilli prior to antigen recognition.
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抗原识别前T细胞微绒毛顶端的CD45预先排除。

DOI:
10.1038/s41467-021-23792-8
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发表时间:
2021-06-23
影响因子:
16.6
通讯作者:
Ley K
Ley K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Jung Y;Wen L;Altman A;Ley K

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酪氨酸磷酸酶 CD45 是抑制 T 细胞激活的主要看门人。将其排除在免疫突触 (IS) 之外对于 T 细胞受体 (TCR) 信号转导至关重要。在这里,我们使用扩展超分辨率显微镜揭示了 CD45 在抗原遇到之前大部分被预先从原代 T 细胞的微绒毛 (MV) 尖端排除。通过消耗胆固醇或改造 CD45 的跨膜结构域以增加其膜整合长度,可以减少这种预排斥,但这种预排斥与 CD45 胞外结构域无关。我们进一步表明,短暂的 MV 介导的接触可以诱导由抗原脉冲的抗原呈递细胞 (APC) 参与的小鼠抗原特异性 T 细胞中的 Ca2+ 流入。我们提出,MV 尖端 CD45 磷酸酶活性的缺乏使得或促进 TCR 在形成稳定的 IS 之前从短暂的 T 细胞-APC 接触中触发,并且这些 MV 介导的接触代表了 T 细胞适应性免疫反应启动的最早步骤。 CD45 限制 T 细胞激活,因此将其排除在 T 细胞免疫突触之外被认为是启用 TCR 信号传导的一种手段。在这里,作者使用多种细胞成像方法证明 CD45 确实被排除在 T 细胞微绒毛尖端之外,并且这种情况发生在与抗原接触之前,表明这种排除是抗原呈递和 T 细胞激活的起始因素之一。
The tyrosine phosphatase CD45 is a major gatekeeper for restraining T cell activation. Its exclusion from the immunological synapse (IS) is crucial for T cell receptor (TCR) signal transduction. Here, we use expansion super-resolution microscopy to reveal that CD45 is mostly pre-excluded from the tips of microvilli (MV) on primary T cells prior to antigen encounter. This pre-exclusion is diminished by depleting cholesterol or by engineering the transmembrane domain of CD45 to increase its membrane integration length, but is independent of the CD45 extracellular domain. We further show that brief MV-mediated contacts can induce Ca2+ influx in mouse antigen-specific T cells engaged by antigen-pulsed antigen presenting cells (APC). We propose that the scarcity of CD45 phosphatase activity at the tips of MV enables or facilitates TCR triggering from brief T cell-APC contacts before formation of a stable IS, and that these MV-mediated contacts represent the earliest step in the initiation of a T cell adaptive immune response. CD45 limits T cell activation, so its exclusion from the T cell immunological synapse is thought to occur as a means to enable TCR signalling. Here the authors use a variety of cellular imaging methods to show that CD45 is indeed excluded from the tips of the T cell microvilli and that this occurs prior to contact with antigen, indicating this exclusion is one of the initiating factors for antigen presentation and T cell activation.
光学成像。膨胀显微镜。
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