Abstract:
:Dendritic cells (DCs) cross-present antigen (Ag) to initiate T-cell immunity against most infections and tumors. Natural killer (NK) cells are innate cytolytic lymphocytes that have emerged as key modulators of multiple DC functions. Here, we show that human NK cells promote cross-presentation of tumor cell-derived Ag by DC leading to Ag-specific CD8(+) T-cell activation. Surprisingly, cytotoxic function of NK cells was not required. Instead, we highlight a critical and nonredundant role for IFN-γ and TNF-α production by NK cells to enhance cross-presentation by DC using two different Ag models. Importantly, we observed that NK cells promote cell-associated Ag cross-presentation selectively by monocytes-derived DC (Mo-DC) and CD34-derived CD11b(neg) CD141(high) DC subsets but not by myeloid CD11b(+) DC. Moreover, we demonstrate that triggering NK cell activation by monoclonal antibodies (mAbs)-coated tumor cells leads to efficient DC cross-presentation, supporting the concept that NK cells can contribute to therapeutic mAbs efficiency by inducing downstream adaptive immunity. Taken together, our findings point toward a novel role of human NK cells bridging innate and adaptive immunity through selective induction of cell-associated Ag cross-presentation by CD141(high) DC, a process that could be exploited to better harness Ag-specific cellular immunity in immunotherapy.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Deauvieau F,Ollion V,Doffin AC,Achard C,Fonteneau JF,Verronese E,Durand I,Ghittoni R,Marvel J,Dezutter-Dambuyant C,Walzer T,Vie H,Perrot I,Goutagny N,Caux C,Valladeau-Guilemond Jdoi
10.1002/ijc.29087subject
Has Abstractpub_date
2015-03-01 00:00:00pages
1085-94issue
5eissn
0020-7136issn
1097-0215journal_volume
136pub_type
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