NMD inhibition by 5-azacytidine augments presentation of immunogenic frameshift-derived neoepitopes
Frameshifted protein sequences elicit tumor-specific T cell-mediated immune responses in microsatellite-unstable (MSI) cancers if presented by HLA class I molecules. However, their expression and presentation are limited by nonsense-mediated RNA decay (NMD). We employed an unbiased immunopeptidomics...
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 April 2021
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| In: |
iScience
Year: 2021, Volume: 24, Issue: 4, Pages: 1-15 |
| ISSN: | 2589-0042 |
| DOI: | 10.1016/j.isci.2021.102389 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.isci.2021.102389 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S2589004221003576 
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| Author Notes: | Jonas P. Becker, Dominic Helm, Mandy Rettel, Frank Stein, Alejandro Hernandez-Sanchez, Katharina Urban, Johannes Gebert, Matthias Kloor, Gabriele Neu-Yilik, Magnus von Knebel Doeberitz, Matthias W. Hentze, and Andreas E. Kulozik |
MARC
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| 245 | 1 | 0 | |a NMD inhibition by 5-azacytidine augments presentation of immunogenic frameshift-derived neoepitopes |c Jonas P. Becker, Dominic Helm, Mandy Rettel, Frank Stein, Alejandro Hernandez-Sanchez, Katharina Urban, Johannes Gebert, Matthias Kloor, Gabriele Neu-Yilik, Magnus von Knebel Doeberitz, Matthias W. Hentze, and Andreas E. Kulozik |
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| 520 | |a Frameshifted protein sequences elicit tumor-specific T cell-mediated immune responses in microsatellite-unstable (MSI) cancers if presented by HLA class I molecules. However, their expression and presentation are limited by nonsense-mediated RNA decay (NMD). We employed an unbiased immunopeptidomics workflow to analyze MSI HCT-116 cells and identified >10,000 HLA class I-presented peptides including five frameshift-derived InDel neoepitopes. Notably, pharmacological NMD inhibition with 5-azacytidine stabilizes frameshift-bearing transcripts and increases the HLA class I-mediated presentation of InDel neoepitopes. The frameshift mutation underlying one of the identified InDel neoepitopes is highly recurrent in MSI colorectal cancer cell lines and primary patient samples, and immunization with the corresponding neoepitope induces strong CD8+ T cell responses in an HLA-A∗02:01 transgenic mouse model. Our data show directly that pharmacological NMD inhibition augments HLA class I-mediated presentation of immunogenic frameshift-derived InDel neoepitopes thus highlighting the clinical potential of NMD inhibition in anti-cancer immunotherapy strategies. | ||
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