title: A role for CD40 expression on CD8+ T cells in the generation of CD8+ T cell memory.
abstract: The delivery of CD4 help to CD8+ T cell responses requires interactions between CD40 and CD40 ligand and is thought to occur through antigen-presenting cell (APC) activation. Here we show that generation of memory CD8+ T cells displaying an enhanced capacity for cell division and cytokine secretion required CD4 help but not CD40 expression by the APCs. Activated CD4+ and CD8+ T cells expressed CD40; and in the absence of this protein, CD8+ T cells were unable to differentiate into memory cells or receive CD4 help. These results suggest that, like B cells, CD8+ T cells receive CD4 help directly through CD40 and that this interaction is fundamental for CD8+ T cell memory generation.
authors.affiliation: INSERM U345, Institut Necker, 156 Rue de Vaugirard, F-75730 Paris Cedex 15, France.
authors.forename: Christine
authors.initials: C
authors.lastname: Bourgeois
authors.forename: Benedita
authors.initials: B
authors.lastname: Rocha
authors.forename: Corinne
authors.initials: C
authors.lastname: Tanchot
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D000938:Antigen-Presenting Cells / Q000276:immunology; D000941:Antigens / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D019013:CD40 Antigens / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D023201:CD40 Ligand / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D002454:Cell Differentiation; D002455:Cell Division; D005260:Female; D007156:Immunologic Memory; D007371:Interferon-gamma / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology* / Q000378:metabolism
chemical_list: D000941:Antigens; D019013:CD40 Antigens; D007376:Interleukin-2; D012333:RNA, Messenger; D023201:CD40 Ligand; D007371:Interferon-gamma