T Cells Specific for an Unconventional Natural Antigen Fail to Recognize Leukemic Cells.

Abstract:

:MHC-bound peptides from aberrant proteins may be a specific immunotherapeutic target on cancer cells. Because of difficulties in identifying such antigens, viral or model antigens have so far been used to study their biological relevance. We here identify a naturally existing human T-cell epitope derived from a truncated protein. The antigenic peptide is derived from the gene TTK only through an alternative transcript containing a premature termination codon that may target the transcript for nonsense-mediated decay (NMD). This antigen is recognized by HLA-A*02:01-restricted CD8+ T cells derived from an allotransplanted leukemia patient. Functional analyses showed that these T cells failed to recognize several HLA-matched primary leukemic cells that expressed the alternative TTK transcript. Conventional antigen processing and presentation were not affected, suggesting that leukemic cells modify the generation of antigens processed from aberrant proteins. This natural TTK epitope provides insights in the source of transcripts producing antigenic epitopes in healthy and leukemic cells. Our data underscore potential pitfalls of targeting NMD-derived or other unconventionally generated epitopes as immunotherapeutic approach.

journal_name

Cancer Immunol Res

authors

Pont MJ,Oostvogels R,van Bergen CAM,van der Meijden ED,Honders MW,Bliss S,Jongsma MLM,Lokhorst HM,Falkenburg JHF,Mutis T,Griffioen M,Spaapen RM

doi

10.1158/2326-6066.CIR-18-0137

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

797-804

issue

5

eissn

2326-6066

issn

2326-6074

pii

2326-6066.CIR-18-0137

journal_volume

7

pub_type

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