Loss of T-bet confers survival advantage to influenza-bacterial superinfection.

Loss of T-bet confers survival advantage to influenza-bacterial superinfection.
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DOI:
10.15252/embj.201899176
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发表时间:
2019-01-03
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Ding JL
Ding JL
中科院分区:
其他
文献类型:
--
作者:
Er JZ;Koean RAG;Ding JL

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转录因子T-bet调节针对一系列感染的1型炎症反应。在这里,我们证明了T-bet对流感病毒和细菌双重感染的先前未解决的作用。有趣的是,我们发现,与野生型宿主相比,T-bet缺陷不会对病毒清除或恢复的功效产生不利影响。相反,在流感病毒感染的T-bet −/−小鼠的肺部,中性粒细胞浸润和Th 17细胞因子(IL-17和IL-22)的产生增加与对随后肺炎链球菌感染的生存优势相关。在T-bet −/−小鼠中,IL-17(而非IL-22)的中和增加了肺细菌负荷,同时中性粒细胞浸润减少,T-bet −/−小鼠的存活率降低。经鉴定,CD 8+、CD 4+和γδ T细胞类型产生的IL-17有助于这种针对细菌双重感染的保护作用。我们进一步表明,T-bet −/−肺中的中性粒细胞耗竭增加了肺细菌负荷。因此,这些结果表明,尽管失去了T-bet,流感病毒清除所需的免疫防御是完全功能性的,这反过来又增强了对致命细菌重复感染的保护性17型免疫应答。
The transcription factor, T‐bet, regulates type 1 inflammatory responses against a range of infections. Here, we demonstrate a previously unaddressed role of T‐bet, to influenza virus and bacterial superinfection. Interestingly, we found that T‐bet deficiency did not adversely affect the efficacy of viral clearance or recovery compared to wild‐type hosts. Instead, increased infiltration of neutrophils and production of Th17 cytokines (IL‐17 and IL‐22), in lungs of influenza virus‐infected T‐bet−/− mice, were correlated with survival advantage against subsequent infection by Streptococcus pneumoniae. Neutralization of IL‐17, but not IL‐22, in T‐bet−/− mice increased pulmonary bacterial load, concomitant with decreased neutrophil infiltration and reduced survival of T‐bet−/− mice. IL‐17 production by CD8+, CD4+ and γδ T cell types was identified to contribute to this protection against bacterial superinfection. We further showed that neutrophil depletion in T‐bet−/− lungs increased pulmonary bacterial burden. These results thus indicate that despite the loss of T‐bet, immune defences required for influenza viral clearance are fully functional, which in turn enhances protective type 17 immune responses against lethal bacterial superinfections.
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