title: Genome-wide characterization of a viral cytotoxic T lymphocyte epitope repertoire.
abstract: A genome-wide search using major histocompatibility complex (MHC) class I binding and proteosome cleavage site algorithms identified 101 influenza A PR8 virus-derived peptides as potential epitopes for CD8+ T cell recognition in the H-2b mouse. Cytokine-based flow cytometry, ELISPOT, and cytotoxic T lymphocyte assays reveal that 16 are recognized by CD8+ T cells recovered directly ex vivo from infected animals, accounting for greater than 70% of CD8+ T cells recruited to lung after primary infection. Only six of the 22 highest affinity MHC class I binding peptides comprise cytotoxic T lymphocyte epitopes. The remaining non-immunogenic peptides have equivalent MHC affinity and MHC-peptide complex half-lives, eliciting T cell responses when given in adjuvant and with T cell receptor-ligand avidity comparable with their immunogenic counterparts. As revealed by a novel high sensitivity nanospray tandem mass spectrometry methodology, failure to process those predicted epitopes may contribute significantly to the absent response. These results have important implications for rationale design of CD8+ T cell vaccines.
authors.affiliation: Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
authors.forename: Weimin
authors.initials: W
authors.lastname: Zhong
authors.forename: Pedro A
authors.initials: PA
authors.lastname: Reche
authors.forename: Char-Chang
authors.initials: CC
authors.lastname: Lai
authors.forename: Bruce
authors.initials: B
authors.lastname: Reinhold
authors.forename: Ellis L
authors.initials: EL
authors.lastname: Reinherz
mesh_terms: D000465:Algorithms; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000378:metabolism; D002857:Chromium / Q000378:metabolism; D016207:Cytokines / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D000939:Epitopes / Q000737:chemistry; D005260:Female; D016678:Genome; D007371:Interferon-gamma / Q000378:metabolism; D008168:Lung / Q000276:immunology; D008285:Major Histocompatibility Complex; D013058:Mass Spectrometry; D051379:Mice; D008810:Mice, Inbred C57BL; D009975:Orthomyxoviridae / Q000235:genetics; D010455:Peptides / Q000737:chemistry; D011233:Precipitin Tests; D011485:Protein Binding; D013602:T-Lymphocytes, Cytotoxic / Q000737:chemistry* / Q000276:immunology*
chemical_list: D016207:Cytokines; D000939:Epitopes; D010455:Peptides; D002857:Chromium; D007371:Interferon-gamma