Dynamic imaging of chemokine-dependent CD8+ T cell help for CD8+ T cell responses.
Naive T lymphocytes move efficiently in lymphoid tissues while scanning dendritic cells in search of cognate complexes of peptide in major histocompatibility molecules. However, T cell migration ceases after recognition of cognate antigen. We show here that during the initiation of antigen-specific CD8(+) T cell responses, naive CD8(+) polyclonal T cells 'preferentially' interacted in an antigen-independent way with mature dendritic cells competent to present antigen to antigen-specific CD8(+) T cells. These antigen-independent interactions required expression of the chemokine receptor CCR5 on polyclonal T cells and increased the efficiency of the induction of naive, low-precursor-frequency CD8(+) T cell responses. Thus, antigen-specific CD8(+) T cells favor the priming of naive CD8(+) T cells by promoting the CCR5-dependent recruitment of polyclonal CD8(+) T cells to mature dendritic cells.
Institut Curie, Centre de Recherche, Paris F-75248, France.
Stéphanie
S
Hugues
Alix
A
Scholer
Alexandre
A
Boissonnas
Alexander
A
Nussbaum
Christophe
C
Combadière
Sebastian
S
Amigorena
Luc
L
Fetler
D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002465:Cell Movement / Q000276:immunology; D018925:Chemokines / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology; D005434:Flow Cytometry; D007091:Image Processing, Computer-Assisted; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D019713:Receptors, CCR5 / Q000276:immunology
D018925:Chemokines; D019713:Receptors, CCR5