Apoptotic cells activate NKT cells through T cell Ig-like mucin-like-1 resulting in airway hyperreactivity.

Apoptotic cells activate NKT cells through T cell Ig-like mucin-like-1 resulting in airway hyperreactivity.
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DOI:
10.4049/jimmunol.1001116
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发表时间:
2010-11-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Umetsu DT
Umetsu DT
中科院分区:
其他
文献类型:
--
作者:
Lee HH;Meyer EH;Goya S;Pichavant M;Kim HY;Bu X;Umetsu SE;Jones JC;Savage PB;Iwakura Y;Casasnovas JM;Kaplan G;Freeman GJ;DeKruyff RH;Umetsu DT

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T细胞免疫球蛋白样粘蛋白样蛋白1(TIM-1)是一种重要的哮喘易感基因,但TIM-1功能的免疫学机制尚不清楚。TIM-1也是磷脂酰丝氨酸(PtdSer)的受体,磷脂酰丝氨酸是细胞发生程序性死亡或凋亡的重要标志。我们现在证明,NKT细胞结构性地表达TIM-1,并被表达PtdSer的凋亡细胞激活。TIM-1识别PtdSer诱导NKT细胞活化、增殖和细胞因子产生。此外,诱导呼吸道上皮细胞的凋亡激活了肺NKT细胞,并以NKT细胞和TIM-1依赖的方式意外地导致了哮喘的主要特征--气道高反应性。这些结果表明,TIM-1在NKT细胞上作为模式识别受体,在凋亡细胞上作为损伤相关的分子模式感知PtdSer。此外,这些结果为导致呼吸道高反应性的一种新的先天途径提供了证据,并可能有助于解释Tim-1和NKT细胞如何调控哮喘。
T cell Ig-like mucin-like–1 (TIM-1) is an important asthma susceptibility gene, but the immunological mechanisms by which TIM-1 functions remain uncertain. TIM-1 is also a receptor for phosphatidylserine (PtdSer), an important marker of cells undergoing programmed cell death, or apoptosis. We now demonstrate that NKT cells constitutively express TIM-1 and become activated by apoptotic cells expressing PtdSer. TIM-1 recognition of PtdSer induced NKT cell activation, proliferation, and cytokine production. Moreover, the induction of apoptosis in airway epithelial cells activated pulmonary NKT cells and unexpectedly resulted in airway hyperreactivity, a cardinal feature of asthma, in an NKT cell-dependent and TIM-1–dependent fashion. These results suggest that TIM-1 serves as a pattern recognition receptor on NKT cells that senses PtdSer on apoptotic cells as a damage-associated molecular pattern. Furthermore, these results provide evidence for a novel innate pathway that results in airway hyperreactivity and may help to explain how TIM-1 and NKT cells regulate asthma.
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