| First Author | Chae WJ | Year | 2017 |
| Journal | Immunology | Volume | 152 |
| Issue | 2 | Pages | 265-275 |
| PubMed ID | 28556921 | Mgi Jnum | J:245604 |
| Mgi Id | MGI:5915373 | Doi | 10.1111/imm.12766 |
| Citation | Chae WJ, et al. (2017) Membrane-bound Dickkopf-1 in Foxp3+ regulatory T cells suppresses T-cell-mediated autoimmune colitis. Immunology 152(2):265-275 |
| abstractText | 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. |
