title: Inhibition of invariant chain expression in dendritic cells presenting endogenous antigens stimulates CD4+ T-cell responses and tumor immunity.
abstract: Induction of potent and sustained antiviral or antitumor immunity is dependent on the efficient activation of CD8+ and CD4+ T cells. While dendritic cells constitute a powerful platform for stimulating cellular immunity, presentation of endogenous antigens by dendritic cells transfected with nucleic acid-encoded antigens favors the stimulation of CD8+ T cells over that of CD4+ T cells. A short incubation of mRNA-transfected dendritic cells with antisense oligonucleotides directed against the invariant chain enhances the presentation of mRNA-encoded class II epitopes and activation of CD4+ T-cell responses in vitro and in vivo. Immunization of mice with the antisense oligonucleotide-treated dendritic cells stimulates a more potent and longer lasting CD8+ cytotoxic T-cell (CTL) response and enhances the antitumor efficacy of dendritic cell-based tumor vaccination protocols. Transient inhibition of invariant chain expression represents a simple and general method to enhance the stimulation of CD4+ T-cell responses from endogenous antigens.
authors.affiliation: Department of Surgery, Box 2601, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Yangbing
authors.initials: Y
authors.lastname: Zhao
authors.forename: David
authors.initials: D
authors.lastname: Boczkowski
authors.forename: Smita K
authors.initials: SK
authors.lastname: Nair
authors.forename: Eli
authors.initials: E
authors.lastname: Gilboa
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D000941:Antigens / Q000235:genetics; D016516:CD4-CD8 Ratio; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D016219:Immunotherapy, Adoptive / Q000379:methods; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D009374:Neoplasms, Experimental / Q000628:therapy*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014162:Transfection
chemical_list: D000941:Antigens; D000949:Histocompatibility Antigens Class II; D016376:Oligonucleotides, Antisense