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[The immunological synapse: models facing facts].

Georges Bismuth1, Alain Trautmann

  • 1Département de Biologie Cellulaire, Inserm U567, CNRS UMR 8104, Equipe Labellisée par la Ligue Nationale Contre le Cancer, Université René-Descartes, Institut Cochin, 22, rue Méchain, 75014 Paris, France. bismuth@cochin.inserm.fr

Medecine Sciences : M/S
|September 12, 2006
PubMed
Summary
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The immunological synapse between T cells and dendritic cells (DCs) can form without antigen and is multifocal, not concentric. This antigen-independent synapse plays roles in T cell priming and survival, challenging the traditional view.

Area of Science:

  • Immunology
  • Cell Biology
  • T cell activation

Context:

  • The traditional view of the immunological synapse describes a mature, concentric structure formed only in the presence of antigen, leading to T cell immobilization.
  • This model was largely based on artificial experimental conditions using high antigen concentrations and surrogate antigen-presenting cells.
  • Recent studies suggest this model may not accurately reflect natural T cell interactions with dendritic cells (DCs).

Purpose:

  • To investigate the formation, structure, and function of the synapse between naive T cells and dendritic cells (DCs) under more physiological conditions.
  • To challenge the dogma that antigen recognition is a prerequisite for synapse formation and T cell immobilization.
  • To elucidate the dynamic nature and signaling pathways involved in T cell-dendritic cell interactions.

Related Experiment Videos

Summary:

  • T cell-DC synapses can form independently of antigen recognition, suggesting roles beyond immediate T cell activation, such as T cell priming and survival signaling.
  • In vivo, T cells interact transiently with DCs before eventual immobilization, and the T-DC synapse exhibits a multifocal structure with numerous tight appositions, rather than a concentric pattern.
  • Synaptic signaling is sustained over hours, involving pathways like phosphatidylinositol 3-kinase activation, which influences transcription factors like FoxO to regulate T cell state.

Impact:

  • This research redefines the understanding of immunological synapse formation and dynamics, particularly in the context of naive T cell activation by DCs.
  • It highlights the importance of antigen-independent interactions in immune cell communication and T cell homeostasis.
  • The findings provide a more accurate model for T cell-DC interactions, relevant for developing novel immunotherapies and understanding immune responses.