Robust Anti-viral Immunity Requires Multiple Distinct T Cell-Dendritic Cell Interactions.
Cell 2015;
162:1322-37. [PMID:
26296422 DOI:
10.1016/j.cell.2015.08.004]
[Citation(s) in RCA: 238] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 06/07/2015] [Accepted: 07/23/2015] [Indexed: 11/30/2022]
Abstract
Host defense against viruses and intracellular parasites depends on effector CD8(+) T cells, whose optimal clonal expansion, differentiation, and memory properties require signals from CD4(+) T cells. Here, we addressed the role of dendritic cell (DC) subsets in initial activation of the two T cell types and their co-operation. Surprisingly, initial priming of CD4(+) and CD8(+) T cells was spatially segregated within the lymph node and occurred on different DCs with temporally distinct patterns of antigen presentation via MHCI versus MHCII molecules. DCs that co-present antigen via both MHC molecules were detected at a later stage; these XCR1(+) DCs are the critical platform involved in CD4(+) T cell augmentation of CD8(+) T cell responses. These findings delineate the complex choreography of cellular interactions underlying effective cell-mediated anti-viral responses, with implications for basic DC subset biology, as well as for translational application to the development of vaccines that evoke optimal T cell immunity.
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