Plasmacytoid dendritic cells enhance mortality during lethal influenza infections by eliminating virus-specific CD8 T cells.

Plasmacytoid dendritic cells enhance mortality during lethal influenza infections by eliminating virus-specific CD8 T cells.
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DOI:
10.4049/jimmunol.0902984
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发表时间:
2010-04-15
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:
Langlois RA;Legge KL

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Previous studies have shown that the reduction in CD8 T cell immunity observed during high-dose influenza virus infection (IAV) is mediated via lymph node (LN) dendritic cells (DC) that express FasL and drive FasL:Fas (DC:T) induced apoptosis. However, the specific DC subset(s) within the LN and the additional factors required for DC-mediated elimination of IAV-specific CD8 T cells remain unknown. Herein, we demonstrate that plasmacytoid DC (pDC) which downregulate FasL during sublethal, but not lethal, IAV-infection accumulate to greater numbers within the LN of lethal dose infected mice. Further our findings show that pDC from lethal, but not sublethal dose IAV infections, drive elimination of Fas+ CD8 T cells and that this elimination only occurs in the absence of TCR recognition of IAV-peptide-MHC class I complexes. Together these results suggest that pDC play a heretofore unknown deleterious role during lethal dose IAV-infections by limiting the CD8 T cell response.
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