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A line of tumor-infiltrating lymphocytes (660TIL) specifically lysed the autologous HLA-A2+ melanoma (660MEL) and also most A2+ melanoma cell lines. We immunoprecipitated A2 from a large number (&gt;10(12)) of 660MEL cells, extracted naturally processed peptides, fractionated them by HPLC, screened the fractions for recognition by 660TIL, and found a single predominant and a minor peak of activity. Although too little was recovered of the major 660MEL peptide to establish its sequence, HPLC fingerprinting showed that it did not correspond to any of the known A2-associated melanoma peptides recognized by T cells, including peptides from tyrosinase, MART-1/Melan-A, gp100 and MAGE-3. The major 660MEL antigenic peptide appears to be derived from MART-1/Melan-A but is neither AAGIGILTV nor ILTVILGVL nor any other MART-1/Melan-A peptide containing the A2 consensus motif. The multiplicity of melanoma peptides recognized by CD8+ T cells, most of which are non-mutated (including most likely the present 660MEL peptide), suggests the existence of unknown mechanisms, perhaps similar to those operating in autoimmune disorders, whereby T cells that recognize normal 'self' sequences become activated.

international immunology

Anti-melanoma cytotoxic T lymphocytes (CTL) recognize numerous antigenic peptides having 'self' sequences: autoimmune nature of the anti-melanoma CTL response