Abstract
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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Acknowledgements
We thank H. Aaron for assistance with microscopy, N. Bhakta for advice on velocity measurements and N. Fernandez, W. Sha, D. Raulet and the members of the Robey laboratory for comments on the manuscript. This work was supported by NIH grants AI32985 and AI42033. P.B. is supported by the Cancer Research Institute.
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Bousso, P., Robey, E. Dynamics of CD8+ T cell priming by dendritic cells in intact lymph nodes. Nat Immunol 4, 579–585 (2003). https://doi.org/10.1038/ni928
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DOI: https://doi.org/10.1038/ni928
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