- Roberts, Edward W;
- Broz, Miranda L;
- Binnewies, Mikhail;
- Headley, Mark B;
- Nelson, Amanda E;
- Wolf, Denise M;
- Kaisho, Tsuneyasu;
- Bogunovic, Dusan;
- Bhardwaj, Nina;
- Krummel, Matthew F
Intratumoral dendritic cells (DC) bearing CD103 in mice or CD141 in humans drive intratumoral CD8(+) T cell activation. Using multiple strategies, we identified a critical role for these DC in trafficking tumor antigen to lymph nodes (LN), resulting in both direct CD8(+) T cell stimulation and antigen hand-off to resident myeloid cells. These effects all required CCR7. Live imaging demonstrated direct presentation to T cells in LN, and CCR7 loss specifically in these cells resulted in defective LN T cell priming and increased tumor outgrowth. CCR7 expression levels in human tumors correlate with signatures of CD141(+) DC, intratumoral T cells, and better clinical outcomes. This work identifies an ongoing pathway to T cell priming, which should be harnessed for tumor therapies.