| First Author | Wohlfert EA | Year | 2006 |
| Journal | J Immunol | Volume | 176 |
| Issue | 3 | Pages | 1316-20 |
| PubMed ID | 16424156 | Mgi Jnum | J:126434 |
| Mgi Id | MGI:3761244 | Doi | 10.4049/jimmunol.176.3.1316 |
| Citation | Wohlfert EA, et al. (2006) Cutting edge: deficiency in the E3 ubiquitin ligase Cbl-b results in a multifunctional defect in T cell TGF-beta sensitivity in vitro and in vivo. J Immunol 176(3):1316-20 |
| abstractText | Mice deficient in the E3 ubiquitin ligase Cbl-b have CD28-independent T cells and develop autoimmunity. We previously reported that Cbl-b-/- CD4+CD25- T effector cells are resistant in vitro to the antiproliferative effects of CD4+CD25+ regulatory T cells and TGF-beta. We have now asked whether the resistance noted in Cbl-b-/- T cells is restricted solely to TGF-beta's antiproliferative effects, whether the TGF-beta resistance has in vivo relevance, and whether a defect can be identified in the TGF-beta signaling pathway. We now demonstrate the following: 1) in vitro, Cbl-b deficiency prevents the TGF-beta-mediated induction of Foxp3+ functional regulatory T cells; 2) in vivo, Cbl-b-/- mice show a significantly enhanced response to a tumor that is strictly TGF-beta regulated; and 3) Cbl-b-/- T effector cells have defective TGF-beta-mediated Smad2 phosphorylation. These studies are the first to document that the E3 ubiquitin ligase Cbl-b plays an integral role in T cell TGF-beta signaling, and that its absence results in multifunctional TGF-beta-related defects that have important disease-related implications. |
