Dynein Separately Partners with NDE1 and Dynactin To Orchestrate T Cell Focused Secretion.

Dynein Separately Partners with NDE1 and Dynactin To Orchestrate T Cell Focused Secretion.
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DOI:
10.4049/jimmunol.1600180
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发表时间:
2016-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Poenie M
Poenie M
中科院分区:
其他
文献类型:
--
作者:
Nath S;Christian L;Tan SY;Ki S;Ehrlich LI;Poenie M

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辅助和细胞毒性 T 细胞通过 MTOC 周围囊泡的聚集以及 MTOC 易位至目标接触位点来实现集中分泌。在这里,使用 Jurkat 细胞和 OT-I T 细胞受体 (TcR) 转基因原代小鼠 CTL,我们发现动力蛋白结合蛋白 NDE1 和 dynactin(以 p150Glued 为代表)与动力蛋白形成互斥的复合物,在靶刺激细胞中表现出非重叠分布,并介导不同的转运事件。当表达 NDE1 显性失活形式(NDE1-EGFP 融合)的 Jurkat 细胞被 SEE 包被的 Raji 细胞激活时,NDE1 和动力蛋白无法在免疫突触 (IS) 处积聚,并且 MTOC 易位受到抑制。 Jurkat 细胞或原代小鼠 CTL 中 NDE1 的敲低也抑制了 MTOC 易位和 CTL 介导的杀伤。与NDE1相反,p150Glued的敲除会耗尽替代动力蛋白-动力蛋白复合物,导致IS处含有细胞内囊泡的CTLA-4和颗粒酶-B的积累受损,而MTOC易位不受影响。 CTL 中 p150Glued 的耗尽也抑制了 CTL 介导的裂解。我们得出结论,NDE1/Lis1 和 dynactin 复合物分别介导 T 细胞集中分泌的两个关键成分,即分别将 MTOC 和裂解颗粒易位至 IS。
Helper and cytotoxic T cells accomplish focused secretion through the clustering of vesicles around the MTOC and translocation of the MTOC to the target contact site. Here, using Jurkat cells and OT-I T cell receptor (TcR) transgenic primary murine CTLs, we show that the dynein-binding proteins NDE1 and dynactin (as represented by p150Glued) form mutually exclusive complexes with dynein, exhibit non-overlapping distributions in target-stimulated cells, and mediate different transport events. When Jurkat cells expressing a dominant negative form of NDE1 (NDE1-EGFP fusion) were activated by SEE-coated Raji cells, NDE1 and dynein failed to accumulate at the immunological synapse (IS) and MTOC translocation was inhibited. Knockdown of NDE1 in Jurkat cells or primary mouse CTLs also inhibited MTOC translocation and CTL-mediated killing. In contrast to NDE1, knockdown of p150Glued, which depleted the alternative dynein-dynactin complex, resulted in impaired accumulation of CTLA-4 and granzyme-B containing intracellular vesicles at the IS, while MTOC translocation was not affected. Depletion of p150Glued in CTLs also inhibited CTL-mediated lysis. We conclude that the NDE1/Lis1 and dynactin complexes separately mediate two key components of T cell focused secretion, namely translocation of the MTOC and lytic granules to the IS, respectively.
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