T cell-derived protein S engages TAM receptor signaling in dendritic cells to control the magnitude of the immune response.

T cell-derived protein S engages TAM receptor signaling in dendritic cells to control the magnitude of the immune response.
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DOI:
10.1016/j.immuni.2013.06.010
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发表时间:
2013-07-25
期刊:
影响因子:
32.4
通讯作者:
Rothlin CV
Rothlin CV
中科院分区:
医学1区
文献类型:
--
作者:
Carrera Silva EA;Chan PY;Joannas L;Errasti AE;Gagliani N;Bosurgi L;Jabbour M;Perry A;Smith-Chakmakova F;Mucida D;Cheroutre H;Burstyn-Cohen T;Leighton JA;Lemke G;Ghosh S;Rothlin CV

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树突状细胞(DC)活化对于诱导针对病原体的免疫防御至关重要,但需要严格控制以避免慢性炎症和过度的免疫反应。在这里,我们确定了一种免疫稳态机制,通过该机制,适应性免疫一旦被触发,就会缓和DC激活并防止过度反应性免疫反应。T细胞一旦被激活,就会产生蛋白S(Pros1),该蛋白S通过DC中的TAM受体酪氨酸激酶发出信号,以限制DC激活的幅度。小鼠T细胞中Pros1的基因消除导致DC中共刺激分子和细胞因子的表达增加,对T细胞依赖性抗原的免疫应答增强,以及结肠炎增加。此外,PROS1在活化的人T细胞中表达,并且其调节DC活化的能力是保守的。我们的研究结果确定了一个迄今为止尚未认识到的,稳态负反馈机制,在接口的适应性和先天性免疫,维持生理幅度的免疫反应。
Dendritic cell (DC) activation is essential for the induction of immune defense against pathogens, yet needs to be tightly controlled to avoid chronic inflammation and exaggerated immune responses. Here, we identify a mechanism of immune homeostasis by which adaptive immunity, once triggered, tempers DC activation and prevents overreactive immune responses. T cells, once activated, produce Protein S (Pros1) that signals through the TAM receptor tyrosine kinases in DCs to limit the magnitude of DC activation. Genetic ablation of Pros1 in mouse T cells leads to increased expression of co-stimulatory molecules and cytokines in DCs, enhanced immune responses to T cell-dependent antigens, as well as increased colitis. Additionally, PROS1 is expressed in activated human T cells and its ability to regulate DC activation is conserved. Our results identify a heretofore unrecognized, homeostatic negative feedback mechanism at the interface of adaptive and innate immunity that maintains the physiological magnitude of the immune response.
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