[PDF][PDF] Migratory dendritic cells, group 1 innate lymphoid cells, and inflammatory monocytes collaborate to recruit NK cells to the virus-infected lymph node

E Wong, RH Xu, D Rubio, A Lev, C Stotesbury, M Fang… - Cell reports, 2018 - cell.com
E Wong, RH Xu, D Rubio, A Lev, C Stotesbury, M Fang, LJ Sigal
Cell reports, 2018cell.com
Circulating natural killer (NK) cells help protect the host from lympho-hematogenous acute
viral diseases by rapidly entering draining lymph nodes (dLNs) to curb virus dissemination.
Here, we identify a highly choreographed mechanism underlying this process. Using
footpad infection with ectromelia virus, a pathogenic DNA virus of mice, we show that
TLR9/MyD88 sensing induces NKG2D ligands in virus-infected, skin-derived migratory
dendritic cells (mDCs) to induce production of IFN-γ by classical NK cells and other types of …
Summary
Circulating natural killer (NK) cells help protect the host from lympho-hematogenous acute viral diseases by rapidly entering draining lymph nodes (dLNs) to curb virus dissemination. Here, we identify a highly choreographed mechanism underlying this process. Using footpad infection with ectromelia virus, a pathogenic DNA virus of mice, we show that TLR9/MyD88 sensing induces NKG2D ligands in virus-infected, skin-derived migratory dendritic cells (mDCs) to induce production of IFN-γ by classical NK cells and other types of group 1 innate lymphoid cells (ILCs) already in dLNs, via NKG2D. Uninfected inflammatory monocytes, also recruited to dLNs by mDCs in a TLR9/MyD88-dependent manner, respond to IFN-γ by secreting CXCL9 for optimal CXCR3-dependent recruitment of circulating NK cells. This work unveils a TLR9/MyD88-dependent mechanism whereby in dLNs, three cell types—mDCs, group 1 ILCs (mostly NK cells), and inflammatory monocytes—coordinate the recruitment of protective circulating NK cells to dLNs.
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