Specific recognition and inhibition of Ewing tumour growth by antigen-specific allo-restricted cytotoxic T cells

U. Thiel, S. Pirson, C. Müller-Spahn, H. Conrad, D. H. Busch, H. Bernhard, S. Burdach, G. H.S. Richter

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Background:The development of a successful immunotherapy is hampered by an ineffective T-cell repertoire against tumour antigens and the inability of the patient's immune system to overcome tolerance-inducing mechanisms. Here, we test the specific recognition and lytical potential of allo-restricted CD8 + T cells against Ewing tumour (ET) associated antigens Enhancer of Zeste, Drosophila Homolog 2 (EZH2), and Chondromodulin-I (CHM1) identified through previous microarray analysis.Methods:Following repetitive CHM1 319 (VIMPCSWWV) and EZH2 666 (YMCSFLFNL) peptide-driven stimulations with HLA-A 0201 dendritic cells (DC), allo-restricted HLA-A 0201 CD8 +T cells were stained with HLA-A 0201/peptide multimers, sorted and expanded by limiting dilution.Results:Expanded T cells specifically recognised peptide-pulsed target cells or antigen-transfected cells in the context of HLA-A 0201 and killed HLA-A 0201 ET lines expressing the antigen while HLA-A 0201- ET lines were not affected. Furthermore, adoptively transferred T cells caused significant ET growth delay in Rag2 / γ C / mice. Within this context, we identified the CHM1 319 peptide as a new candidate target antigen for ET immunotherapy.Conclusion:These results clearly identify the ET-derived antigens, EZH2 666 and CHM1 319, as suitable targets for protective allo-restricted human CD8 T-cell responses against non-immunogenic ET and may benefit new therapeutic strategies in ET patients treated with allogeneic stem cell transplantation.

Original languageEnglish
Pages (from-to)948-956
Number of pages9
JournalBritish Journal of Cancer
Volume104
Issue number6
DOIs
StatePublished - 15 Mar 2011

Keywords

  • Ewing tumour
  • adoptive transfer
  • immunotherapy
  • multimer technology

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