title: DC-expressed MHC class I single-chain trimer-based vaccines prime cytotoxic T lymphocytes against exogenous but not endogenous antigens.
abstract: The poor immunogenicity of many tumors can be partly explained by the inefficiency of the MHC class I peptide presentation pathway. MHC-I-based single-chain trimers (SCT) represent a new class of molecules with the potential to overcome this limitation. We here evaluated the ability of SCT presenting a melanoma antigen peptide (TRP-2) to prime cytotoxic T lymphocyte (CTL) responses in mice when given as DNA vaccines via Gene Gun or when expressed by dendritic cells. The SCT was unable to induce detectable priming or significant anti-tumor activity of CTL using either vaccination strategy, whereas control SCT (with an exogenous peptide) primed strong responses. This study thus provides the first data related to the use of SCT in combination with DC and their application toward self antigens and suggest this potent technology, alone, is insufficient to overcome self tolerance.
authors.affiliation: Department of Immunobiology, The University of Arizona, Tucson, AZ 85724, United States.
authors.forename: Maria L
authors.initials: ML
authors.lastname: Ordaz
authors.forename: Nicolas
authors.initials: N
authors.lastname: Larmonier
authors.forename: Lonnie
authors.initials: L
authors.lastname: Lybarger
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000276:immunology*; D019470:Biolistics; D019496:Cancer Vaccines / Q000276:immunology*; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D005260:Female; D005805:Genes, MHC Class I; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D006801:Humans; D019746:Intramolecular Oxidoreductases / Q000276:immunology*; D008545:Melanoma / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009368:Neoplasm Transplantation; D017634:Self Tolerance / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D019444:Vaccines, DNA / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm; D019496:Cancer Vaccines; D015395:Histocompatibility Antigens Class I; D019444:Vaccines, DNA; D019746:Intramolecular Oxidoreductases; C042501:dopachrome isomerase