期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 202, 期 9, 页码 1271-1278出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20051018
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The cellular mode of T cell priming in vivo remains to be characterized fully. We investigated the fate of T cell-dendritic cell ( DC) interactions in the late phase of T cell activation in the lymph node. In general, CD4 T cells detach from DCs before undergoing cell division. Using a new approach to track the history of antigen ( Ag)-recognition events, we demonstrated that activated/divided T cells reengage different DCs in an Ag-specific manner. Two-photon imaging of intact lymph nodes suggested that T cells could establish prolonged interactions with DCs at multiple stages during the activation process. Importantly, signals that are delivered during subsequent DC contacts are integrated by the T cell and promote sustained IL-2R alpha expression and IFN-gamma production. Thus, repeated encounters with Ag-bearing DCs can occur in vivo and modulate CD4 T cell differentiation programs.
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