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Comprehensive analysis of HLA-DR- and HLA-DP4-restricted CD4+ T cell response specific for the tumor-shared antigen survivin in healthy donors and cancer patients

Comprehensive analysis of HLA-DR- and HLA-DP4-restricted CD4+ T cell response specific for the tumor-shared antigen survivin in healthy donors and cancer patients

Journal of Immunology 181(1): 431-439

Because of the wide distribution of the survivin Ag in a variety of tumors, we have investigated the survivin-specific CD4+ T cell response in healthy donors and cancer patients. Screening of the entire sequence of survivin for HLA class II binding led to the identification of seven HLA-DR promiscuous peptides, including four HLA-DP4 peptides. All of the peptides were able to prime in vitro CD4+ T cells of eight different healthy donors. The peptide-specific T cell lines were stimulated by dendritic cells loaded with the recombinant protein or with the lysates of tumor cells. The high frequency of responders (i.e., immunoprevalence) was provided by a wide reactivity of multiple peptides. Six peptides were T cell stimulating in at least half of the donors and were close to CD8+ T cell epitopes. HLA-DR molecules were more frequently involved in T cell stimulation than were HLA-DP4 molecules, and hence immunoprevalence relies mainly on HLA-DR promiscuity in the survivin Ag. In two cancer patients a spontaneous CD4+ T cell response specific for one of these peptides was also observed. Based on these observations, the tumor-shared survivin does not appear to be the target of immune tolerance in healthy donors and cancer patients and is a relevant candidate for cancer vaccine.

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Accession: 052269692

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PMID: 18566409

DOI: 10.4049/jimmunol.181.1.431

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