Dynamic Imaging of T Cell-Dendritic Cell Interactions in Lymph Nodes

TLDR

T cell immune responses begin within organized lymphoid tissues, yet the pace, topology, and outcomes of their cellular interactions have only been inferred from static imaging or cultured cells. The study reports dynamic visualization of antigen‑specific T cells interacting with dendritic cells in intact explanted lymph nodes. High‑resolution live imaging was used to observe antigen‑specific T cells and dendritic cells within these lymph nodes. Immunological synapse formation and prolonged interactions were seen, followed by T‑cell activation, dissociation, and rapid migration away from the antigenic stimulus, shedding light on early immune responses in lymphoid structures.

Abstract

T cell immune responses begin within organized lymphoid tissues. The pace, topology, and outcomes of the cellular interactions that underlie these responses have, so far, been inferred from static imaging of sectioned tissue or from studies of cultured cells. Here we report dynamic visualization of antigen-specific T cells interacting with dendritic cells within intact explanted lymph nodes. We observed immunological synapse formation and prolonged interactions between these two cell types, followed by the activation, dissociation, and rapid migration of T cells away from the antigenic stimulus. This high-resolution spatiotemporal analysis provides insight into the nature of cell interactions critical to early immune responses within lymphoid structures.