title: Melanoma-specific CD4+ T cells recognize nonmutated HLA-DR-restricted tyrosinase epitopes.
abstract: Tyrosinase was the first melanoma-associated antigen shown to be recognized by CD4+ T cells. In this study, we have identified two HLA-DRB1*0401-restricted peptides recognized by these T cells: Ty 56-70 and Ty 448-462. As with many of the MHC class I-restricted melanoma epitopes, both are nonmutated self peptides that have intermediate and weak MHC binding affinities, respectively. Mutated and truncated versions of these peptides were used to define their MHC binding anchor residues. Anchor residues were then modified to derive peptides with increased MHC binding affinities and T cell stimulatory properties. Ty 56-70 and Ty 448-462 enhance the list of immunogenic HLA-A2-, A24-, and B44-restricted tyrosinase peptides already described. Thus, tyrosinase provides a model for anti-melanoma vaccines in which a single molecule can generate multivalent immunization incorporating both CD4+ and CD8+ T cell responses.
authors.affiliation: Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Topalian
authors.forename: M I
authors.initials: MI
authors.lastname: Gonzales
authors.forename: M
authors.initials: M
authors.lastname: Parkhurst
authors.forename: Y F
authors.initials: YF
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Southwood
authors.forename: A
authors.initials: A
authors.lastname: Sette
authors.forename: S A
authors.initials: SA
authors.lastname: Rosenberg
authors.forename: P F
authors.initials: PF
authors.lastname: Robbins
mesh_terms: D000595:Amino Acid Sequence; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000502:physiology; D002478:Cells, Cultured; D000939:Epitopes / Q000276:immunology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism; D006684:HLA-DR Antigens / Q000276:immunology*; D059811:HLA-DRB1 Chains; D006650:Histocompatibility Testing; D006801:Humans; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology* / Q000502:physiology; D008545:Melanoma / Q000276:immunology*; D008969:Molecular Sequence Data; D014442:Monophenol Monooxygenase / Q000276:immunology*; D009362:Neoplasm Metastasis
chemical_list: D000939:Epitopes; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; C553505:HLA-DRB1*04:01 antigen; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D014442:Monophenol Monooxygenase