Personalized adoptive immunotherapy for patients with EBVassociated tumors and complications: Evaluation of novel naturally processed and presented EBV-derived T-cell epitopes

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Maren Bieling
  • Sabine Tischer
  • Ulrich Kalinke
  • Rainer Blasczyk
  • Buus, Søren
  • Britta Maecker-Kolhoff
  • Britta Eiz-Vesper

Morbidity and mortality of immunocompromised patients are increased by primary infection with or reactivation of Epstein-Barr virus (EBV), possibly triggering EBV+ post-transplant lymphoproliferative disease (PTLD). Adoptive transfer of EBV-specific cytotoxic T cells (EBV-CTLs) promises a non-toxic immunotherapy to effectively prevent or treat these complications. To improve immunotherapy and immunomonitoring this study aimed at identifying and evaluating naturally processed and presented HLA-A*03:01-restricted EBV-CTL epitopes as immunodominant targets. More than 15000 peptides were sequenced from EBV-immortalized B cells transduced with soluble HLA-A*03:01, sorted using different epitope prediction tools and eleven candidates were preselected. T2 and Flex-T peptide-binding and dissociation assays confirmed the stability of peptide-MHC complexes. Their immunogenicity and clinical relevance were evaluated by assessing the frequencies and functionality of EBV-CTLs in healthy donors (n > 10) and EBV+ PTLD-patients (n = 5) by multimer staining, Eli- and FluoroSpot assays. All eleven peptides elicited EBV-CTL responses in the donors. Their clinical applicability was determined by small-scale T-cell enrichment using Cytokine Secretion Assay and immunophenotyping. Mixtures of these peptides when added to the EBV Consensus pool revealed enhanced stimulation and enrichment efficacy. These EBV-specific epitopes broadening the repertoire of known targets will improve manufacturing of clinically applicable EBV-CTLs and monitoring of EBV-specific T-cell responses in patients.

OriginalsprogEngelsk
TidsskriftOncoTarget
Vol/bind9
Udgave nummer4
Sider (fra-til)4737-4757
Antal sider21
ISSN1949-2553
DOI
StatusUdgivet - jan. 2018

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