| First Author | Sharabi A | Year | 2019 |
| Journal | JCI Insight | Volume | 5 |
| PubMed ID | 30912768 | Mgi Jnum | J:308985 |
| Mgi Id | MGI:6753674 | Doi | 10.1172/jci.insight.126294 |
| Citation | Sharabi A, et al. (2019) PP2A enables IL-2 signaling by preserving IL-2Rbeta chain expression during Treg development. JCI Insight 5 |
| abstractText | Tregs require IL-2 signaling for signal transducer and activator of transcription 5 (STAT5)-mediated induction of Foxp3. While phosphatase 2A (PP2A) is a negative regulator of IL-2 production in effector T cells and Tregs do not produce IL-2, it is not known whether PP2A controls IL-2 signaling in Tregs. To address the role of PP2A in IL-2 signaling in Tregs we studied mice engineered to lack PP2A in all Foxp3-expressing cells. We report that PP2A is required to enable Foxp3 expression and to maintain sufficient numbers of Tregs in the thymus. We show for the first time that PP2A prevents the selective loss of surface IL-2Rbeta and preserves IL-2R signaling potency in Tregs. The loss of IL-2Rbeta in thymus- and spleen-derived Tregs that lack PP2A is due to increased sheddase activity. Pan-sheddase or selective A disintegrin and metalloproteinase 10 (ADAM10) inhibition, like forced expression of IL-2Rbeta in PP2A-deficient Tregs restored IL-2Rbeta expression and signaling. Thus, PP2A restrains the sheddase activity of ADAM10 in Treg cells to prevent the cleavage of IL-2Rbeta from the cell surface to enable competent IL-2R signaling which is essential for Tregs development and homeostasis. |
