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• W2007802172 abstract "Coinhibitory PD-1/PD-L1 (B7-H1) interactions provide critical signals for the regulation of autoreactive T-cell responses. We established mouse models, expressing the costimulator molecule B7.1 (CD80) on pancreatic beta cells (RIP-B7.1 tg mice) or are deficient in coinhibitory PD-L1 or PD-1 molecules (PD-L1−/− and PD-1−/− mice), to study induction of preproinsulin (ppins)-specific CD8 T-cell responses and experimental autoimmune diabetes (EAD) by DNA-based immunization. RIP-B7.1 tg mice allowed us to identify two CD8 T-cell specificities: pCI/ppins DNA exclusively induced Kb/A12–21-specific CD8 T-cells and EAD, whereas pCI/ppinsΔA12–21 DNA (encoding ppins without the COOH-terminal A12–21 epitope) elicited Kb/B22–29-specific CD8 T-cells and EAD. Specific expression/processing of mutant ppinsΔA12–21 (but not ppins) in non-beta cells, targeted by intramuscular DNA-injection, thus facilitated induction of Kb/B22–29-specific CD8 T-cells. The A12–21 epitope binds Kb molecules with a very low avidity as compared with B22–29. Interestingly, immunization of coinhibition-deficient PD-L1−/− or PD-1−/− mice with pCI/ppins induced Kb/A12–21-monospecific CD8 T-cells and EAD but injections with pCI/ppinsΔA12–21 did neither recruit Kb/B22–29-specific CD8 T-cells into the pancreatic target tissue nor induce EAD. PpinsΔA12–21/(Kb/B22–29)-mediated EAD was efficiently restored in RIP-B7.1+/PD-L1−/− mice, differing from PD-L1−/− mice only in the tg B7.1 expression in beta cells. Alternatively, an ongoing beta cell destruction and tissue inflammation, initiated by ppins/(Kb/A12–21)-specific CD8 T-cells in pCI/ppins+pCI/ppinsΔA12–21 co-immunized PD-L1−/− mice, facilitated the expansion of ppinsΔA12–21/(Kb/B22–29)-specific CD8 T-cells. CD8 T-cells specific for the high-affinity Kb/B22–29- (but not the low-affinity Kb/A12–21)-epitope thus require stimulatory ´help from beta cells or inflamed islets to expand in PD-L1-deficient mice. The new PD-1/PD-L1 diabetes models may be valuable tools to study under well controlled experimental conditions distinct hierarchies of autoreactive CD8 T-cell responses, which trigger the initial steps of beta cell destruction or emerge during the pathogenic progression of EAD." @default.
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• W2007802172 date "2013-08-19" @default.
• W2007802172 modified "2023-09-27" @default.
• W2007802172 title "A Missing PD-L1/PD-1 Coinhibition Regulates Diabetes Induction by Preproinsulin-Specific CD8 T-Cells in an Epitope-Specific Manner" @default.
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• W2007802172 doi "https://doi.org/10.1371/journal.pone.0071746" @default.
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