| First Author | Kuhn C | Year | 2017 |
| Journal | J Immunol | Volume | 198 |
| Issue | 3 | Pages | 1202-1209 |
| PubMed ID | 28039301 | Mgi Jnum | J:252829 |
| Mgi Id | MGI:5926552 | Doi | 10.4049/jimmunol.1600921 |
| Citation | Kuhn C, et al. (2017) IL-6 Inhibits Upregulation of Membrane-Bound TGF-beta 1 on CD4+ T Cells and Blocking IL-6 Enhances Oral Tolerance. J Immunol 198(3):1202-1209 |
| abstractText | Oral administration of Ag induces regulatory T cells that express latent membrane-bound TGF-beta (latency-associated peptide [LAP]) and have been shown to play an important role in the induction of oral tolerance. We developed an in vitro model to study modulation of LAP+ on CD4+ T cells. The combination of anti-CD3 mAb, anti-CD28 mAb, and recombinant IL-2 induced expression of LAP on naive CD4+ T cells, independent of Foxp3 or exogenous TGF-beta. In vitro generated CD4+LAP+Foxp3- T cells were suppressive in vitro, inhibiting proliferation of naive CD4+ T cells and IL-17A secretion by Th17 cells. Assessing the impact of different cytokines and neutralizing Abs against cytokines, we found that LAP induction was decreased in the presence of IL-6 and IL-21, and to a lesser extent by IL-4 and TNF-alpha. IL-6 abrogated the in vitro induction of CD4+LAP+ T cells by STAT3-dependent inhibition of Lrrc32 (glycoprotein A repetitions predominant [GARP]), the adapter protein that tethers TGF-beta to the membrane. Oral tolerance induction was enhanced in mice lacking expression of IL-6R by CD4+ T cells and by treatment of wild-type mice with neutralizing anti-IL-6 mAb. These results suggest that proinflammatory cytokines interfere with oral tolerance induction and that blocking the IL-6 pathway is a potential strategy for enhancing oral tolerance in the setting of autoimmune and inflammatory diseases. |
