JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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BCL6 is required for differentiation of Ig-like transcript 3-Fc-induced CD8+ T suppressor cells.

Journal of Immunology 2010 November 16
Ig-like transcript 3 (ILT3) is an inhibitory receptor expressed by tolerogenic dendritic cells. When human CD8(+) T cells are allostimulated in the presence of recombinant ILT3-Fc protein, they differentiate into antigenic specific T suppressor (Ts) cells that inhibit CD4 and CD8 T cell effector function both in vitro and in vivo. ILT3-Fc-induced CD8(+) Ts cells express high amounts of BCL6 that are crucial to their function. Knockdown of BCL6 from unprimed human T cells prevents their differentiation into Ts cells, whereas ex vivo overexpression of BCL6 converts CD8(+) T cells into Ts cells. NOD/SCID mice transplanted with human pancreatic islets and humanized by injection of human PBMCs tolerate the graft and develop BCL6(high) CD8(+) Ts cells when treated with ILT3-Fc before or after the onset of rejection. This indicates that ILT3-Fc acts through BCL6 and is a potent immunosuppressive agent for reversing the onset of allo- or possibly autoimmune attacks against pancreatic islets.

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