Inactivation of c-Cbl reverses neonatal lethality and T cell developmental arrest of SLP-76-deficient mice.

Inactivation of c-Cbl reverses neonatal lethality and T cell developmental arrest of SLP-76-deficient mice.
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DOI:
10.1084/jem.20040262
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发表时间:
2004-07-05
影响因子:
15.3
通讯作者:
Hodes, RJ
Hodes, RJ
中科院分区:
医学1区
文献类型:
--
作者:
Chiang, YJ;Sommers, CL;Jordan, MS;Gu, H;Samelson, LE;Koretzky, GA;Hodes, RJ

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c-Cbl是一种衔接蛋白,其负调节参与胸腺阳性选择的信号转导事件。为了进一步表征c-Cbl在T细胞发育中的功能,我们分析了c-Cbl失活在支架分子SLP-76缺陷的小鼠中的作用。SLP-76缺陷型小鼠表现出高频率的新生儿致死性;在存活的小鼠中,T细胞发育在DN 3阶段被阻断。c-cbl的失活完全逆转了SLP-76缺陷小鼠中观察到的新生儿致死率,并部分逆转了这些小鼠中的T细胞发育停滞。SLP-76−/− Cbl−/−小鼠表现出极化的辅助性T细胞(Th)1和Th 2细胞外周CD 4 + T细胞的显著扩增,实质器官的淋巴浸润和过早死亡。这种T细胞发育的拯救是T细胞受体依赖性的,因为它不会发生在重组激活基因2−/− SLP-76−/− Cbl−/−三重敲除小鼠中。对SLP-76−/− Cbl−/− T细胞信号转导特性的分析揭示了一种新的SLP-76-和连接体,用于激活细胞外信号调节激酶激活的T细胞非依赖性途径,该途径通常由c-Cbl下调。
c-Cbl is an adaptor protein that negatively regulates signal transduction events involved in thymic-positive selection. To further characterize the function of c-Cbl in T cell development, we analyzed the effect of c-Cbl inactivation in mice deficient in the scaffolding molecule SLP-76. SLP-76–deficient mice show a high frequency of neonatal lethality; and in surviving mice, T cell development is blocked at the DN3 stage. Inactivation of c-cbl completely reversed the neonatal lethality seen in SLP-76–deficient mice and partially reversed the T cell development arrest in these mice. SLP-76−/− Cbl−/− mice exhibited marked expansion of polarized T helper type (Th)1 and Th2 cell peripheral CD4+ T cells, lymphoid infiltrates of parenchymal organs, and premature death. This rescue of T cell development is T cell receptor dependent because it does not occur in recombination activating gene 2−/− SLP-76−/− Cbl−/− triple knockout mice. Analysis of the signal transduction properties of SLP-76−/− Cbl−/− T cells reveals a novel SLP-76– and linker for activation of T cells–independent pathway of extracellular signal–regulated kinase activation, which is normally down-regulated by c-Cbl.
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