title: B-Lymphocytes activated by CD40 ligand induce an antigen-specific anti-tumour immune response by direct and indirect activation of CD8(+) T-cells.
abstract: In this report, we describe the ability of CD40-ligand (CD40L)-activated, antigen-loaded B-cells to initiate antigen-specific anti-tumour immune responses in vivo. Mice immunized by means of intravenous administration of CD40L-activated B-cells loaded with an MHC class-I-binding peptide, and challenged with a tumour cell line expressing the same class-I epitope, showed a marked delay in tumour growth, compared to non-immunized controls or to mice receiving either freshly isolated B-cells or B-cells activated with lipopolysaccharide or interleukin-4. The ability of CD40L-activated B-cells to induce antigen-specific T-cell activation appeared to be through a combination of cross-presentation of antigen from activated B-cells to resident antigen-presenting cells and direct T-cell activation by the administered B-cells themselves. Immunization with CD40L-activated B-cells may, therefore, represent a means by which to stimulate anti-tumour CD8(+) T-cell responses in vivo.
authors.affiliation: Malaghan Institute of Medical Research, Wellington School of Medicine, Wellington, New Zealand. dritchie@malaghan.org.nz
authors.forename: D S
authors.initials: DS
authors.lastname: Ritchie
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.forename: I F
authors.initials: IF
authors.lastname: Hermans
authors.forename: F
authors.initials: F
authors.lastname: Ronchese
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D000951:Antigens, Neoplasm / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism*; D023201:CD40 Ligand / Q000276:immunology / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000378:metabolism*; D045142:Cross-Priming / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D008070:Lipopolysaccharides / Q000276:immunology; D051379:Mice; D009369:Neoplasms / Q000276:immunology* / Q000378:metabolism; D013154:Spleen / Q000166:cytology / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm; D000949:Histocompatibility Antigens Class II; D008070:Lipopolysaccharides; D023201:CD40 Ligand