GITR activation induces an opposite effect on alloreactive CD4(+) and CD8(+) T cells in graft-versus-host disease

The Journal of Experimental Medicine
Stephanie J MuriglanMarcel R M van den Brink

Abstract

Glucocorticoid-induced tumor necrosis factor receptor family-related gene (GITR) is a member of the tumor necrosis factor receptor (TNFR) family that is expressed at low levels on unstimulated T cells, B cells, and macrophages. Upon activation, CD4(+) and CD8(+) T cells up-regulate GITR expression, whereas immunoregulatory T cells constitutively express high levels of GITR. Here, we show that GITR may regulate alloreactive responses during graft-versus-host disease (GVHD) after allogeneic bone marrow transplantation (BMT). Using a BMT model with major histocompatibility complex class I and class II disparity, we demonstrate that GITR stimulation in vitro and in vivo enhances alloreactive CD8(+)CD25(-) T cell proliferation, whereas it decreases alloreactive CD4(+)CD25(-) proliferation. Allo-stimulated CD4(+)CD25(-) cells show increased apoptosis upon GITR stimulation that is dependent on the Fas-FasL pathway. Recipients of an allograft containing CD8(+)CD25(-) donor T cells had increased GVHD morbidity and mortality in the presence of GITR-activating antibody (Ab). Conversely, recipients of an allograft with CD4(+)CD25(-) T cells showed a significant decrease in GVHD when treated with a GITR-activating Ab. Our findings indicate ...Continue Reading

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Methods Mentioned

BETA
FACS
flow cytometry

Software Mentioned

Flowjo

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