A novel pathway down-modulating T cell activation involves HPK-1-dependent recruitment of 14-3-3 proteins on SLP-76.

A novel pathway down-modulating T cell activation involves HPK-1-dependent recruitment of 14-3-3 proteins on SLP-76.
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下调 T 细胞激活的新途径涉及 HPK-1 依赖性在 SLP-76 上招募 14-3-3 蛋白。

DOI:
10.1084/jem.20062066
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发表时间:
2007-03-19
影响因子:
15.3
通讯作者:
Acuto, Oreste
Acuto, Oreste
中科院分区:
医学1区
文献类型:
--
作者:
Di Bartolo, Vincenzo;Montagne, Benjamin;Salek, Mogjiborahman;Jungwirth, Britta;Carrette, Florent;Fourtane, Julien;Sol-Foulon, Nathalie;Michel, Frederique;Schwartz, Olivier;Lehmann, Wolf D.;Acuto, Oreste

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含有SH2结构域的白细胞蛋白76 kD (SLP-76)是控制T细胞受体(TCR)介导激活的信号机制的关键元件。在这里,我们确定了14-3-3和ζ蛋白作为SLP-76的结合伙伴。这种相互作用是由TCR连接诱导的,需要SLP-76的376丝氨酸磷酸化。核糖核酸干扰和体外磷酸化实验表明,丝氨酸376是造血祖激酶1 (HPK-1)的靶点。有趣的是,S376A突变或hkp -1敲低都会导致tcr诱导的SLP-76和磷脂酶C-γ -1酪氨酸磷酸化增加。此外,SLP-76 - s376a突变体比野生型SLP-76诱导更高的白细胞介素2基因转录。这些数据揭示了一个新的负反馈回路,涉及hkp -1依赖性丝氨酸磷酸化SLP-76和14-3-3蛋白募集,从而调节T细胞的激活。
The SH2 domain–containing leukocyte protein of 76 kD (SLP-76) is a pivotal element of the signaling machinery controlling T cell receptor (TCR)-mediated activation. Here, we identify 14-3-3ɛ and ζ proteins as SLP-76 binding partners. This interaction was induced by TCR ligation and required phosphorylation of SLP-76 at serine 376. Ribonucleic acid interference and in vitro phosphorylation experiments showed that serine 376 is the target of the hematopoietic progenitor kinase 1 (HPK-1). Interestingly, either S376A mutation or HPK-1 knockdown resulted in increased TCR-induced tyrosine phosphorylation of SLP-76 and phospholipase C-γ1. Moreover, an SLP-76–S376A mutant induced higher interleukin 2 gene transcription than wild-type SLP-76. These data reveal a novel negative feedback loop involving HPK-1–dependent serine phosphorylation of SLP-76 and 14-3-3 protein recruitment, which tunes T cell activation.
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