The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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Published 7 November 2005. doi:10.1084/jem.20051018
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 202, Number 9, 1271-1278
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ARTICLE

CD4 T cells integrate signals delivered during successive DC encounters in vivo

Susanna Celli, Zacarias Garcia, and Philippe Bousso

G5 Dynamiques des Réponses Immunes, INSERM 668, Département d'Immunologie, Institut Pasteur, 75015 Paris, France

CORRESPONDENCE Philippe Bousso: bousso{at}pasteur.fr

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.


Abbreviations used: Ag, antigen; CFSE, carboxyl fluorescein succinimidyl ester; i.d., intradermally.

S. Celli and Z. Garcia contributed equally to this work.


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