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• W2018102452 abstract "Programmed cell death 1 ligand 1 (PD-L1) is an important regulator of T-cell responses and may consequently limit anticancer immunity. We have recently identified PD-L1-specific, cytotoxic CD8+ T cells. In the present study, we develop these findings and report that CD4+ helper T cells spontaneously recognize PD-L1. We examined the locality of a previously identified HLA-A*0201-restricted PD-L1-epitope for the presence of possible CD4+ T-cell epitopes. Thus, we identified naturally occurring PD-L1-specific CD4+ T cells among the peripheral blood lymphocytes of cancer patients and - to lesser extents - healthy donors, by means of ELISPOT assays. PD-L1-specific CD4+ T cells appeared to be TH17 cells exhibiting an effector T-cell cytokine profile. Hence, PD-L1-specific CD4+ T cells released interferon γ (IFNγ), tumor necrosis factor α (TNFα) and interleukin-17 (IL-17) in response to a long PD-L1-derived peptide. Furthermore, we demonstrate that the specific recognition of PD-L1 by CD4+ T cells is MHC class II-restricted. Natural T-cell responses against PD-L1 are noteworthy as they may play a prominent role in the regulation of the immune system. Thus, cytokine release from PD-L1-specific CD4+ T cells may surmount the overall immunosuppressive actions of this immune checkpoint regulator. Moreover, PD-L1-specific T cells might be useful for anticancer immunotherapy, as they may counteract common mechanisms of immune escape mediated by the PD-L1/PD-1 pathway." @default.
• W2018102452 created "2016-06-24" @default.
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• W2018102452 date "2013-04-01" @default.
• W2018102452 modified "2023-10-15" @default.
• W2018102452 title "The immune checkpoint regulator PD-L1 is a specific target for naturally occurring CD4⁺T cells" @default.
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• W2018102452 doi "https://doi.org/10.4161/onci.23991" @default.
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