CD8 T cells utilize TRAIL to control influenza virus infection.

CD8 T cells utilize TRAIL to control influenza virus infection.
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DOI:
10.4049/jimmunol.181.7.4918
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发表时间:
2008-10-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Legge KL
Legge KL
中科院分区:
其他
文献类型:
--
作者:
Brincks EL;Katewa A;Kucaba TA;Griffith TS;Legge KL

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原发性流感病毒感染期间流感病毒感染细胞的消除被认为是由 CD8+ T 细胞通过穿孔素和 FasL 介导的机制介导的。然而,最近的研究表明,CD8+ T 细胞也可以利用 TNF 相关的凋亡诱导配体 (TRAIL) 来杀死病毒感染的细胞。因此,我们在此研究了 TRAIL 对流感特异性 CD8+ T 细胞免疫和流感病毒感染控制的重要性。我们的结果表明,TRAIL 缺陷增加了流感相关发病率和流感病毒滴度,并且疾病严重程度的这些变化与 TRAIL−/− 小鼠中流感特异性 CD8+ T 细胞的细胞毒性降低有关——尽管肺部流感特异性 CD8+ T 细胞数量相同,但这种降低还是发生了。此外,TRAIL表达选择性地发生在流感特异性CD8+T细胞上,并且高TRAIL受体(DR5)表达选择性地发生在流感病毒感染的肺上皮细胞上。最后,我们发现 TRAIL+/+ 而非 TRAIL−/− CD8+ 效应 T 细胞的过继转移改变了与致死剂量流感病毒感染相关的死亡率。总的来说,我们的结果表明 TRAIL 是流感感染免疫的重要组成部分,TRAIL 缺陷会降低 CD8+ T 细胞介导的细胞毒性,导致更严重的流感感染。
Elimination of influenza virus infected cells during primary influenza virus infections is thought to be mediated by CD8+ T cells though perforin- and FasL-mediated mechanisms. However, recent studies suggest that CD8+ T cells can also utilize TNF-related apoptosis-inducing ligand (TRAIL) to kill virally-infected cells. Therefore, we herein examined the importance of TRAIL to influenza-specific CD8+ T cell immunity and to the control of influenza virus infections. Our results show that TRAIL deficiency increases influenza-associated morbidity and influenza virus titers, and that these changes in disease severity are coupled to decreased influenza-specific CD8+ T cell cytotoxicity in TRAIL−/− mice—a decrease that occurs despite equivalent numbers of pulmonary influenza-specific CD8+ T cells. Further, TRAIL expression occurs selectively on influenza-specific CD8+ T cells, and high TRAIL receptor (DR5) expression occurs selectively on influenza-virus-infected pulmonary epithelial cells. Finally, we show that adoptive transfer of TRAIL+/+ but not TRAIL−/− CD8+ effector T cells alters the mortality associated with lethal dose influenza virus infections. Collectively, our results suggest that TRAIL is an important component of immunity to influenza infections, and TRAIL deficiency decreases CD8+ T cell-mediated cytotoxicity leading to more severe influenza infections.
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