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Liu, Yuan; Zheng, Jian; Liu, Yinping; Wen, Liyan; Huang, Lei; Xiang, Zheng; Lam, Kwok-Tai; Lv, Aizhen; Mao, Huawei; Lau, Yu-Lung; Tu, Wenwei
Cellular & molecular immunology, 09/2018, Volume: 15, Issue: 9Journal Article
Natural killer (NK) cells are indispensable components of both the innate and adaptive immune response. However, their precise roles in the cross-talk between innate and adaptive immunity during influenza virus infection remain controversial. By comparing NK cell dynamics and activity under a sub-lethal dose and high dose of influenza virus infection, we showed that influenza virus PR8 directly infected NK cells during natural infection, which was consistent with our previous findings obtained from an in vitro investigation of human NK cells. The impairments in cytotoxicity and IFN-γ production by spleen NK cells following high-dose infection were accompanied by decreased virus-specific killing mediated by cytotoxic T lymphocytes (CTLs). Importantly, the weakened CTL activity could be reversed by adoptive transfer of spleen NK cells harvested from low-dose-infected mice but not healthy donors. Taken together, our data provide direct evidence supporting the contribution of NK cells to antiviral T-cell responses. This study also indicates that a novel NK-targeted immune evasion strategy is used by influenza virus to shrink both innate and adaptive immune responses.
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