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Real-Time Manipulation of T Cell-Dendritic Cell Interactions In Vivo Reveals the Importance of Prolonged Contacts for CD4+ T Cell Activation

Abstract : T cells interact with dendritic cells (DCs) for periods lasting from minutes to hours. However, a causal link between the duration of this interaction and the efficiency of T cell activation has not been established in vivo. Employing intravital two-photon imaging, we manipulated T cell-DC interactions in real time and found that the first T cell-DC encounter often resulted in a long-lived interaction. Moreover, the cessation of T cell receptor-major histocompatibility complex signals promoted cellular dissociation, suggesting that antigen availability on DCs regulates contact duration. Finally, at least 6 hr of in vivo T cell-DC interaction were required for naive CD4 + T cells to undergo clonal expansion. These results establish the importance of prolonged T cell-DC interactions for efficient CD4 + T cell activation in vivo.
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Submitted on : Wednesday, January 5, 2022 - 6:28:23 PM
Last modification on : Thursday, April 7, 2022 - 10:10:29 AM

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Susanna Celli, Fabrice Lemaître, Philippe Bousso. Real-Time Manipulation of T Cell-Dendritic Cell Interactions In Vivo Reveals the Importance of Prolonged Contacts for CD4+ T Cell Activation. Immunity, Elsevier, 2007, 27 (4), pp.625-634. ⟨10.1016/j.immuni.2007.08.018⟩. ⟨pasteur-03513340⟩

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