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Induction of antigen-specific human T suppressor cells by membrane and soluble ILT3.

Abstract：

:Antigen-specific CD8 suppressor T cells (CD8(+) Ts) are adaptive regulatory T cells that are induced in vivo and in vitro by chronic antigenic stimulation of human T cells. CD8(+) Ts induce the upregulation of the inhibitory receptors ILT3 and ILT4 on monocytes and dendritic cells rendering these antigen presenting cells (APCs) tolerogenic. Tolerogenic APCs induce CD4(+) T helper anergy and elicit the differentiation of CD4(+) and CD8(+) T regulatory/suppressor cells. Overexpression of membrane ILT3 in APC results in inhibition of NF-κB activation, transcription of inflammatory cytokines and costimulatory molecules. Soluble ILT3-Fc which contains only the extracellular, Ig-like domain linked to mutated IgG1 Fc, is strongly immunosuppressive. ILT3-Fc, induces the differentiation of human CD8(+) Ts which inhibit CD4(+) Th and CD8(+) CTL effector function both in vitro and in vivo. The acquisition of Ts' function by primed CD8(+) T cells treated with ILT3-Fc was demonstrated to be the effect of the significant upregulation of BCL6, a transcriptional repressor of IL-2, IFN-gamma, IL-5 and granzyme B. The upregulated expression of BCL6, SOCS1 and DUSP10 is integral to the signature of ILT3-Fc-induced CD8(+) Ts. These genes are known inhibitors of cytokine production and TCR signaling and are targeted by miRNAs which are suppressed by ILT3-Fc. ILT3-Fc induces tolerance to allogeneic human islets and reverses rejection after its onset in a humanized NOD/SCID mouse model. Based on these findings we postulate that ILT3-Fc may become an important new agent for treatment of autoimmunity and transplant rejection.

journal_name

Exp Mol Pathol

journal_title

Experimental and molecular pathology

authors

Vlad G,Suciu-Foca N

doi

10.1016/j.yexmp.2012.09.011

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

294-301

issue

3

eissn

0014-4800

issn

1096-0945

pii

S0014-4800(12)00133-5

journal_volume

93

pub_type

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