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• W2079632471 abstract "The ultimate goal for the treatment of autoimmunity is to restore immunological tolerance. Regulatory T cells (Treg) play a central role in immune tolerance, and Treg functional abnormalities have been identified in different autoimmune diseases, including rheumatoid arthritis (RA). We have previously shown that natural Treg from RA patients are competent at suppressing responder T cell proliferation but not cytokine production. Here, we explore the hypothesis that this Treg defect in RA is linked with abnormalities in the expression and function of CTLA-4. We demonstrate that CTLA-4 expression on Treg from RA patients was significantly reduced compared with healthy Treg and is associated with an increased rate of CTLA-4 internalization. Regulation of T cell receptor signaling by CTLA-4 was impaired in RA Treg and associated with delayed recruitment of CTLA-4 to the immunological synapse. Artificial induction of CTLA-4 expression on RA Treg restored their suppressive capacity. Furthermore, CTLA-4 blockade impaired healthy Treg suppression of T cell IFN-γ production, but not proliferation, thereby recapitulating the unique Treg defect in RA. Our results suggest that defects in CTLA-4 could contribute to abnormal Treg function in RA and may represent a target for therapy for inducing long-lasting remission." @default.
• W2079632471 created "2016-06-24" @default.
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• W2079632471 date "2008-12-09" @default.
• W2079632471 modified "2023-09-26" @default.
• W2079632471 title "Defects in CTLA-4 are associated with abnormal regulatory T cell function in rheumatoid arthritis" @default.
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• W2079632471 doi "https://doi.org/10.1073/pnas.0806855105" @default.
• W2079632471 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2614772" @default.
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