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The Journal of Immunology, 2003, 171: 6283-6289.
Copyright © 2003 by The American Association of Immunologists

Identification of Five New HLA-B*3501-Restricted Epitopes Derived from Common Melanoma-Associated Antigens, Spontaneously Recognized by Tumor-Infiltrating Lymphocytes 1

Houssem Benlalam*, Boris Linard*, Yannik Guilloux*,{dagger}, Agnès Moreau-Aubry*,{dagger}, Laurent Derré*, Elisabeth Diez*, Brigitte Dreno*,{ddagger}, Francine Jotereau*,{dagger} and Nathalie Labarrière2,*

* Unit Institut National de la Santé et de la Recherche Médicale Unité 463, Nantes, France; {dagger} Faculté des Sciences de Nantes, Nantes, France; and {ddagger} Unit of Skin Cancer, Centre Hospitalier Régional Hotel Dieu, Nantes, Place Alexis Ricordeau, Nantes, France

We previously described HLA-B35-restricted melanoma tumor-infiltrating lymphocyte responses to frequently expressed melanoma-associated Ags: tyrosinase, Melan-A/MART-1, gp100, MAGE-A3/MAGE-A6, and NY-ESO-1. Using clones derived from these TIL, we identified in this study the corresponding epitopes. We show that five of these epitopes are new and that melanoma cells naturally present all the six epitopes. Interestingly, five of these epitopes correspond to or encompass melanoma-associated Ag epitopes presented in other HLA contexts, such as A2, A1, B51, and Cw3. In particular, the HLA-B35-restricted Melan-A epitope is mimicked by the peptide 26–35, already known as the most immunodominant melanoma epitope in the HLA-A*0201 context. Because this peptide lacked adequate anchor amino acid residues for efficient binding to HLA-B35, modified peptides were designed. Two of these analogues were found to induce higher PBL- and tumor-infiltrating lymphocyte-specific responses than the parental peptide, suggesting that they could be more immunogenic in HLA-B*3501 melanoma patients. These data have important implications for the formulation of polypeptide-based vaccines as well as for the monitoring of melanoma-specific CTL response in HLA-B*3501 melanoma patients.




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