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CD8 T cells mediate antiviral immunity but are also implicated in autoimmunity.1,–,2 Responses elicited by immunogenic peptides target only a minute fraction of all potential peptide determinants, a phenomenon termed immunodominance.3–4 Immunodominance can be readily assessed for CD8 T-cell responses targeting Epstein–Barr virus (EBV), a herpes family virus that establishes life-long persistent infection in over 90% of the adult population.5 Here we hypothesised that, largely independent of an individual's medical condition, immunosuppression is inefficient at shifting established immunodominance. To test this hypothesis, we quantitatively assessed CD8 T-cell responses targeting defined EBV-derived peptides in individuals with differing medical histories exposed to immunosuppressive regimens of variable intensity.
The frequency of interferon γ-secreting T cells specific for any of 91 defined EBV-derived major histocompatibility complex I epitopes, optimally restricted by a wide range of human leucocyte antigen class I alleles, was quantified by enzyme-linked immunospot assays (ELISpot).6 In …
Funding TD is supported by the FAG (‘Freiwillige Akademische Gesellschaft’) of Basel and by an EULAR bursary, CH by the Swiss National Science Foundation (SNSF) (PP00B-114850).
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the Ethik Komission beider Basel.
Provenance and peer review Not commissioned; externally peer reviewed.
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