Differential requirement for CARMA1 in agonist-selected T-cell development.

Differential requirement for CARMA1 in agonist-selected T-cell development.
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DOI:
10.1002/eji.200838734
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发表时间:
2009-01
影响因子:
5.4
通讯作者:
Xavier, Ramnik J.
Xavier, Ramnik J.
中科院分区:
医学3区
文献类型:
--
作者:
Medoff, Benjamin D.;Sandall, Barry P.;Landry, Aimee;Nagahama, Kiyotaka;Mizoguchi, Atsushi;Luster, Andrew D.;Xavier, Ramnik J.

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含有 Caspase 募集结构域的膜相关鸟苷酸激酶蛋白 1 (CARMA1) 是由 T 细胞受体 (TCR) 参与介导的核因子 κB (NF-κB) 信号级联的关键组成部分。除了激活初始 T 细胞外,TCR 信号传导对于激动剂选择的 T 细胞亚群(例如调节性 T 细胞 (Treg)、自然杀伤 T 细胞 (NKT) 和 CD8ααT 细胞)的发育也很重要。然而,人们对 CARMA1 在这些谱系发育中的作用知之甚少。在这里,我们发现 CARMA1 缺陷小鼠 (CARMA1−/−) 改变了激动剂选择的 T 细胞特定亚群的群体。具体来说,CARMA1−/− 小鼠的自然和适应性 Treg 发育受损,而 NKT 细胞数量与野生型小鼠相比正常。有趣的是,CD8αα T 细胞也可能通过胸腺外选择途径发育,在 CARMA1−/− 小鼠的肠道中富集,而记忆表型 CD4+ T 细胞 (CD62Llow/CD44high) 在外周的数量减少。这些结果表明 CARMA1 对于 Treg 发育至关重要,但对于其他激动剂选择的 T 细胞亚群的发育不是必需的。总体而言,这些数据揭示了 CARMA1 介导的 TCR 信号在 T 细胞发育中的重要但不同的作用。
Caspase recruitment domain-containing membrane-associated guanylate kinase protein-1 (CARMA1) is a critical component of the nuclear factor κB (NF-κB) signaling cascade mediated by T cell receptor (TCR) engagement. In addition to activation of naïve T cells, TCR signaling is important for the development of agonist-selected T cell subsets such as regulatory T cells (Treg), natural killer T cells (NKT), and CD8ααT cells. However, little is known about the role of CARMA1 in the development of these lineages. Here we show that CARMA1-deficient mice (CARMA1−/−) have altered populations of specific subsets of agonist-selected T cells. Specifically, CARMA1−/− mice have impaired natural and adaptive Treg development, while NKT cell numbers are normal compared to wild-type mice. Interestingly, CD8αα T cells, which may also be able to develop through an extrathymic selection pathway, are enriched in the gut of CARMA1−/− mice, while memory-phenotype CD4+ T cells (CD62Llow/CD44high) are present at reduced numbers in the periphery. These results indicate that CARMA1 is essential for Treg development, but is not necessary for the development of other agonist-selected T cell subsets. Overall, these data reveal an important but differential role for CARMA1-mediated TCR signaling in T cell development.
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