Negative Regulation of Lymphocyte Activation by the Adaptor Protein LAX 1

Negative Regulation of Lymphocyte Activation by the Adaptor Protein LAX 1
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接头蛋白 LAX 1 对淋巴细胞激活的负调控

DOI:
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发表时间:
2005
影响因子:
4.4
通讯作者:
Weiguo Zhang
Weiguo Zhang
中科院分区:
医学2区
文献类型:
--
作者:
Minghua Zhu;Olivia Granillo;R. Wen;Kaiyong Yang;X. Dai;Demin Wang;Weiguo Zhang

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膜相关接头蛋白 LAX 是激活淋巴组织中表达的 T 细胞 (LAT) 样分子的接头。在刺激 T 或 B 细胞后,它被磷酸化并与 Grb2 和 PI3K 的 p85 亚基相互作用。然而,LAX 不能替代 TCR 信号通路中的 LAT。在这项研究中,我们报告说,T 细胞或 B 细胞激活后,LAX 蛋白显着上调。虽然通过同源重组破坏 LAX 基因对淋巴细胞发育没有重大影响,但它导致成熟 B 细胞上 CD23 表达显着减少。有趣的是,幼稚的 LAX−/− 小鼠具有自发的生发中心形成。与正常 T 和 B 细胞相比,LAX−/− T 和 B 细胞反应过度,并且钙通量、蛋白酪氨酸磷酸化、MAPK 和 Akt 激活以及 T 或 B AgR 参与后的细胞存活率增强。我们的数据表明 LAX 在淋巴细胞信号传导中发挥负调节作用。
The membrane-associated adaptor protein LAX is a linker for activation of T cells (LAT)-like molecule that is expressed in lymphoid tissues. Upon stimulation of T or B cells, it is phosphorylated and interacts with Grb2 and the p85 subunit of PI3K. LAX, however, is not capable of replacing LAT in the TCR signaling pathway. In this study we report that upon T or B cell activation, the LAX protein was up-regulated dramatically. Although disruption of the LAX gene by homologous recombination had no major impact on lymphocyte development, it caused a significant reduction in CD23 expression on mature B cells. Interestingly, naive LAX−/− mice had spontaneous germinal center formation. Compared with normal T and B cells, LAX−/− T and B cells were hyperresponsive and had enhanced calcium flux, protein tyrosine phosphorylation, MAPK and Akt activation, and cell survival upon engagement of the T or B AgRs. Our data demonstrate that LAX functions as a negative regulator in lymphocyte signaling.
DOI: 10.1126/science.278.5338.687
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