Generation of cytotoxic T-cell responses with synthetic melanoma-associated peptides in vivo: implications for tumor vaccines with melanoma-associated antigens

International Journal of Cancer. Journal International Du Cancer
E JäegerA Knuth

Abstract

Peptide epitopes derived from differentiation antigens of the melanocyte lineage have been identified in human melanomas and normal cultured melanocytes as targets for MHC-restricted cytotoxic T lymphocytes (CTL). Characterization of multiple CTL-defined antigenic determinants and the presence of corresponding precursor CTL open perspectives for the development of antigen-based vaccines. In the present study, we determined the CTL reactivity against melanoma-associated peptides derived from Melan A/MART-1, tyrosinase and gp100/Pmel17 in 10 HLA-A2+ melanoma patients and 10 healthy individuals. Then, we examined the immunological effects and toxicity of intradermal inoculation of synthetic melanoma-associated peptides. Six patients with advanced melanoma received weekly intradermal injections of 6 melanoma-associated peptides and the influenza matrix peptide as a control for 4 consecutive weeks. DTH reactions were observed in 5/6 patients at the injections sites of the tyrosinase signal peptide and of the influenza matrix peptide. No toxic side effects were observed. Changes in CTL reactivity after peptide vaccination were assessed by an MLPC assay for each peptide. Generation of peptide-specific CTL was documented against Melan ...Continue Reading

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