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• W4313373428 startingPage "239.34" @default.
• W4313373428 abstract "Abstract The majority of JAK2WT myeloproliferative neoplasms (MPN) have disease-initiating frameshift mutations in calreticulin (CALR) resulting in a common novel C-terminal mutant fragment (CALRMUT), representing an attractive source of neoantigens for cancer vaccines. However, studies have shown that CALRMUT-specific T cells are rare in CALRMUT MPN patients, but the reasons for this phenomenon are unknown. In this study, we examine class-I major histocompatibility complex (MHC-I) allele frequency in CALRMUT MPN patients from two independent cohorts and observed that MHC-I alleles that present CALRMUT neoepitopes with high affinity are under-represented in CALRMUT MPN patients. We speculate that this is due to an increased chance of immune-mediated tumor rejection by individuals expressing one of these MHC-I alleles. As a result of this MHC-I allele restriction, we reasoned that CALRMUT MPN patients would not efficiently respond to cancer vaccines composed of the CALRMUT fragment, but could do so with a properly modified CALRMUT heteroclitic peptide vaccine approach. We found that heteroclitic CALRMUT peptides designed for CALRMUT MPN patient MHC-I alleles elicited a cross-reactive CD8+ T cell response in human PBMC samples otherwise unable to respond to the matched weakly immunogenic CALRMUT native peptides. We also modeled this effect in mice and observed that C57BL/6J mice, which are unable to mount an immune response to CALRMUT, can mount a cross-reactive CD8+ T cell response against a CALRMUT peptide upon heteroclitic peptide immunization and this was further amplified by combining with anti-PD-1. Together, our data underscore the therapeutic potential of heteroclitic peptide-based cancer vaccines in CALRMUT MPN patients." @default.
• W4313373428 created "2023-01-06" @default.
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• W4313373428 date "2020-05-01" @default.
• W4313373428 modified "2023-10-18" @default.
• W4313373428 title "Heteroclitic peptide cancer vaccine counters MHC-I skewing in mutant calreticulin-positive myeloproliferative neoplasms" @default.
• W4313373428 doi "https://doi.org/10.4049/jimmunol.204.supp.239.34" @default.
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