| First Author | Zhang Q | Year | 2017 |
| Journal | Sci Immunol | Volume | 2 |
| Issue | 9 | PubMed ID | 28783703 |
| Mgi Jnum | J:260063 | Mgi Id | MGI:6143929 |
| Doi | 10.1126/sciimmunol.aah4569 | Citation | Zhang Q, et al. (2017) LAG3 limits regulatory T cell proliferation and function in autoimmune diabetes. Sci Immunol 2(9) |
| abstractText | Inhibitory receptors (IRs) are pivotal in controlling T cell homeostasis because of their intrinsic regulation of conventional effector T (Tconv) cell proliferation, viability, and function. However, the role of IRs on regulatory T cells (Tregs) remains obscure because they could be required for suppressive activity and/or limit Treg function. We evaluated the role of lymphocyte activation gene 3 (LAG3; CD223) on Tregs by generating mice in which LAG3 is absent on the cell surface of Tregs in a murine model of type 1 diabetes. Unexpectedly, mice that lacked LAG3 expression on Tregs exhibited reduced autoimmune diabetes, consistent with enhanced Treg proliferation and function. Whereas the transcriptional landscape of peripheral wild-type (WT) and Lag3-deficient Tregs was largely comparable, substantial differences between intra-islet Tregs were evident and involved a subset of genes and pathways that promote Treg maintenance and function. Consistent with these observations, Lag3-deficient Tregs outcompeted WT Tregs in the islets but not in the periphery in cotransfer experiments because of enhanced interleukin-2-signal transducer and activator of transcription 5 signaling and increased Eos expression. Our study suggests that LAG3 intrinsically limits Treg proliferation and function at inflammatory sites, promotes autoimmunity in a chronic autoimmune-prone environment, and may contribute to Treg insufficiency in autoimmune disease. |
