Membrane-bound Dickkopf-1 in Foxp3+ regulatory T cells suppresses T-cell-mediated autoimmune colitis

Title
Membrane-bound Dickkopf-1 in Foxp3+ regulatory T cells suppresses T-cell-mediated autoimmune colitis
Authors
박종현채욱진Octavian HenegariuSaliha YilmazLiming HaoAlfred L. M. Bothwell
Issue Date
2017-10
Publisher
Immunology
Citation
VOL 152, NO 2-275
Abstract
Induction of tolerance is a key mechanism to maintain or to restore immunological homeostasis. Here we show that Foxp3(+) regulatory T (Treg) cells use Dickkopf-1 (DKK-1) to regulate T-cell-mediated tolerance in the T-cell-mediated autoimmune colitis model. Treg cells from DKK-1 hypomorphic doubleridge mice failed to control CD4(+) T-cell proliferation, resulting in CD4 T-cell-mediated autoimmune colitis. Thymus-derived Treg cells showed a robust expression of DKK-1 but not in naive or effector CD4 T cells. DKK-1 expression in Foxp3(+) Treg cells was further increased upon T-cell receptor stimulation in vitro and in vivo. Interestingly, Foxp3(+) Treg cells expressed DKK-1 in the cell membrane and the functional inhibition of DKK-1 using DKK-1 monoclonal antibody abrogated the suppressor function of Foxp3(+) Treg cells. DKK-1 expression was dependent on de novo protein synthesis and regulated by the mitogen-activated protein kinase pathway but not by the canonical Wnt pathway. Taken together, our results highlight membrane-bound DKK-1 as a novel Treg-derived mediator to maintain immunological tolerance in T-cell-mediated autoimmune colitis.
URI
http://pubs.kist.re.kr/handle/201004/68935
ISSN
0019-2805
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