An immunodominant SSX-2-derived epitope recognized by CD4+ T cells in association with HLA-DR

Maha Ayyoub, Charles S. Hesdorffer, Monica Montes, Andrea Merlo, Daniel Speiser, Donata Rimoldi, Jean Charles Cerottini, Gerd Ritter, Matthew Scanlan, Lloyd J. Old, Danila Valmori

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Ectopic gene expression in tumors versus normal somatic tissues provides opportunities for the specific immunotargeting of cancer cells. SSX gene products are expressed in tumors of different histological types and can be recognized by tumor-reactive CTLs from cancer patients. Here, we report the identification of an SSX-2-derived immunodominant T cell epitope recognized by CD4+ T cells from melanoma patients in association with HLA-DR. The epitope maps to the 37-58 region of the protein, encompassing the sequence of the previously defined HLA-A2-restricted immunodominant epitope SSX-2 41-49. SSX-237-58-specific CD4+ T cells were detected among circulating lymphocytes from the majority of melanoma patients analyzed and among tumor-infiltrating lymphocytes, but not in healthy donors. Together, our data suggest a dominant role of the 37-58 sequence in the induction of cellular CD4+ T cell responses against SSX antigens and will be instrumental for both the onset and the monitoring of upcoming cancer-vaccine trials using SSX-derived immunogens.

Original languageEnglish (US)
Pages (from-to)1225-1233
Number of pages9
JournalJournal of Clinical Investigation
Issue number8
StatePublished - Apr 2004
Externally publishedYes

ASJC Scopus subject areas

  • General Medicine


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