Cross-Reactivity and Anti-viral Function of Dengue Capsid and NS3-Specific Memory T Cells Toward Zika Virus.

Cross-Reactivity and Anti-viral Function of Dengue Capsid and NS3-Specific Memory T Cells Toward Zika Virus.
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DOI:
10.3389/fimmu.2018.02225
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发表时间:
2018
影响因子:
7.3
通讯作者:
Rivino L
Rivino L
中科院分区:
医学2区
文献类型:
--
作者:
Lim MQ;Kumaran EAP;Tan HC;Lye DC;Leo YS;Ooi EE;MacAry PA;Bertoletti A;Rivino L

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寨卡病毒(ZIKV)是一种与登革热病毒(DENV)具有同源性的黄病毒,正在向登革病毒高流行地区传播。异源T细胞免疫,即病毒特异性记忆T细胞被来自不同病毒的变异肽激活,可导致病毒清除增强或保护性免疫减弱和免疫病理改变。在小鼠中,DENV特异性CD8+ T细胞对随后的ZIKV感染提供体内保护作用。在人类中,对比研究报告完全不存在或不同程度的DENV/ZIKV T细胞交叉反应。此外,交叉反应性T细胞识别对T细胞抗病毒能力的影响尚不清楚。本研究表明,denv特异性记忆T细胞在体内和体外扩增后分别在n = 7/10和n = 9/9登革热免疫个体中对ZIKV NS3表现出强大的交叉反应识别。相反,对ZIKV衣壳的交叉反应性较低或不存在。DENV或ZIKV NS3肽的交叉反应性识别引起类似的抗病毒效应介质IFN-γ、TNF-α和CD107a的产生。我们鉴定出9个DENV/ZIKV交叉反应性表位,其中7个是CD4+ T细胞表位,2个是CD8+ T细胞表位。我们还发现,靶向新的NS3表位的交叉反应性CD4+和CD8+ T细胞对zikv感染的细胞显示出抗病毒效应,CD8+ T细胞介导这些细胞的直接裂解。我们的研究结果表明,DENV ns3特异性记忆T细胞对ZIKV表现出抗病毒效应能力,这表明在人类感染ZIKV时,预先存在的DENV T细胞免疫可能具有潜在的有益作用。
Zika virus (ZIKV), a flavivirus with homology to dengue virus (DENV), is spreading to areas of DENV hyper-endemicity. Heterologous T cell immunity, whereby virus-specific memory T cells are activated by variant peptides derived from a different virus, can lead to enhanced viral clearance or diminished protective immunity and altered immunopathology. In mice, CD8+ T cells specific for DENV provide in vivo protective efficacy against subsequent ZIKV infection. In humans, contrasting studies report complete absence or varying degrees of DENV/ZIKV T cell cross-reactivity. Moreover, the impact of cross-reactive T cell recognition on the anti-viral capacity of T cells remains unclear. Here, we show that DENV-specific memory T cells display robust cross-reactive recognition of ZIKV NS3 ex vivo and after in vitro expansion in respectively n = 7/10 and n = 9/9 dengue-immune individuals tested. In contrast, cross-reactivity toward ZIKV capsid is low or absent. Cross-reactive recognition of DENV or ZIKV NS3 peptides elicits similar production of the anti-viral effector mediators IFN-γ, TNF-α, and CD107a. We identify 9 DENV/ZIKV cross-reactive epitopes, 7 of which are CD4+ and 2 are CD8+ T cell epitopes. We also show that cross-reactive CD4+ and CD8+ T cells targeting novel NS3 epitopes display anti-viral effector potential toward ZIKV-infected cells, with CD8+ T cells mediating direct lyses of these cells. Our results demonstrate that DENV NS3-specific memory T cells display anti-viral effector capacity toward ZIKV, suggesting a potential beneficial effect in humans of pre-existing T cell immunity to DENV upon ZIKV infection.
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DOI: 10.1056/nejmoa1601824
发表时间: 2016-06-02
影响因子: 158.5
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