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- W1483055471 abstract "Abstract ABSTRACT Crosslinking of ligand-engaged cytotoxic T lymphocyte antigen-4 (CTLA-4) to the T cell receptor (TCR) during the early phase of T cell activation attenuates TCR signaling, leading to T cell inhibition. To promote this event, a bispecific fusion protein comprising a mutant mouse CD80 (CD80w88a) and lymphocyte activation antigen-3 (LAG-3) was engineered to concurrently engage CTLA-4 and crosslink it to the TCR. Crosslinking is expected to attain via ligation of CTLA-4 first to MHC II and then indirectly to the TCR, generating a CTLA-4-MHC II-TCR tri-molecular complex that forms between T cells and antigen-presenting cells (APCs) during T cell activation. Treating T cells with this bispecific fusion protein inhibited T cell activation. In addition, it induced the production of IL-10 and TGF- β and attenuated AKT and mTOR signaling. Intriguingly, treatment with the bispecific fusion protein also directed early T cell differentiation into Foxp3+ regulatory T cells (Tregs). This process was dependent on the endogenous production of TGF- β. Thus, bispecific fusion proteins that engage CTLA-4 and co-ligate it to the TCR during the early phase of T cell activation can negatively regulate the T cell response. Bispecific biologics with such dual functions may therefore represent a novel class of therapeutics for immune modulation. The findings presented here also reveal a potential new role for CTLA-4 in Treg differentiation." @default.
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- W1483055471 date "2012-05-01" @default.
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- W1483055471 title "Ligation of CTLA-4 to the TCR inhibits T cell activation and directs differentiation into Foxp3+ regulatory T cells (72.2)" @default.
- W1483055471 doi "https://doi.org/10.4049/jimmunol.188.supp.72.2" @default.
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