title: Dendritic cells but not B cells present antigenic complexes to class II-restricted T cells after administration of protein in adjuvant.
abstract: We have analyzed the relative contribution of dendritic cells (DC) and B cells in the presentation of peptide-class II complexes in an inflammatory situation in vivo. Draining lymph node cells from mice immunized subcutaneously with hen egg-white lysozyme (HEL) in adjuvant display HEL peptide-major histocompatibility complex class II complexes able to stimulate, in the absence of any further antigen addition, specific T hybridoma cells. The antigen-presenting capacity of three different antigen-presenting cell (APC) populations recruited in lymph nodes, DC (N418+, class II+, B220-, low buoyant density), large B cells (B220+, low buoyant density), and small B cells (B220+, high buoyant density), was analyzed. After immunization with HEL in adjuvant, DC are the only lymph node APC population expressing detectable HEL peptide-class II complexes. These results indicate that lymph node DC and not B cells are the APC initiating the immune response in vivo after administration of antigen in adjuvant.
authors.affiliation: Roche Milano Ricerche, Milan, Italy.
authors.forename: J C
authors.initials: JC
authors.lastname: Guéry
authors.forename: F
authors.initials: F
authors.lastname: Ria
authors.forename: L
authors.initials: L
authors.lastname: Adorini
mesh_terms: D000276:Adjuvants, Immunologic; D000818:Animals; D000938:Antigen-Presenting Cells / Q000166:cytology / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D002645:Chickens; D003713:Dendritic Cells / Q000276:immunology*; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D006825:Hybridomas; D007249:Inflammation; D007700:Kinetics; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D008247:Lysosomes / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D013045:Species Specificity; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D000949:Histocompatibility Antigens Class II