title: L-selectin-negative CCR7- effector and memory CD8+ T cells enter reactive lymph nodes and kill dendritic cells.
abstract: T lymphocytes lacking the lymph node-homing receptors L-selectin and CCR7 do not migrate to lymph nodes in the steady state. Instead, we found here that lymph nodes draining sites of mature dendritic cells or adjuvant inoculation recruited L-selectin-negative CCR7- effector and memory CD8+ T cells. This recruitment required CXCR3 expression on T cells and occurred through high endothelial venules in concert with lumenal expression of the CXCR3 ligand CXCL9. In reactive lymph nodes, recruited T cells established stable interactions with and killed antigen-bearing dendritic cells, limiting the ability of these dendritic cells to activate naive CD4+ and CD8+ T cells. The inducible recruitment of blood-borne effector and memory T cells to lymph nodes may represent a mechanism for terminating primary and limiting secondary immune responses.
authors.affiliation: Institute for Research in Biomedicine, CH-6500 Bellinzona, Switzerland.
authors.forename: Greta
authors.initials: G
authors.lastname: Guarda
authors.forename: Miroslav
authors.initials: M
authors.lastname: Hons
authors.forename: Silvia F
authors.initials: SF
authors.lastname: Soriano
authors.forename: Alex Y
authors.initials: AY
authors.lastname: Huang
authors.forename: Rosalind
authors.initials: R
authors.lastname: Polley
authors.forename: Alfonso
authors.initials: A
authors.lastname: Martín-Fontecha
authors.forename: Jens V
authors.initials: JV
authors.lastname: Stein
authors.forename: Ronald N
authors.initials: RN
authors.lastname: Germain
authors.forename: Antonio
authors.initials: A
authors.lastname: Lanzavecchia
authors.forename: Federica
authors.initials: F
authors.lastname: Sallusto
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002465:Cell Movement / Q000276:immunology*; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000276:immunology* / Q000473:pathology; D007156:Immunologic Memory; D019041:L-Selectin / Q000096:biosynthesis / Q000378:metabolism*; D008198:Lymph Nodes / Q000276:immunology* / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D054400:Receptors, CCR7; D019707:Receptors, Chemokine / Q000096:biosynthesis / Q000378:metabolism*; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: C515371:Ccr7 protein, mouse; D054400:Receptors, CCR7; D019707:Receptors, Chemokine; D019041:L-Selectin