Journal
NATURE IMMUNOLOGY
Volume 4, Issue 6, Pages 579-585Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ni928
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Funding
- NIAID NIH HHS [AI32985, AI42033] Funding Source: Medline
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The cellular dynamics underlying activation of CD8(+) T cells by dendritic cells (DCs) in the lymph node are not known. Here we have tracked the behavior of T cells and DCs by subjecting intact lymph nodes to real-time two-photon microscopy. We show that DCs scan at least 500 different T cells per hour in the absence of antigen. Antigen-bearing DCs are highly efficient in recruiting peptide-specific T cells and can engage more than ten T cells simultaneously. The duration of these interactions is of the order of hours, not minutes. The overall avidity of the interaction influences the probability that T cells will be stably captured by DCs, providing a possible basis for T cell competition. Taken together, our results identify the cellular behaviors that promote an efficient CD8(+) T cell response in the lymph node.
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