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An essential role for IL-2 receptor in regulatory T cell function #MMPMID27595233
Chinen T; Kannan AK; Levine AG; Fan X; Klein U; Zheng Y; Gasteiger G; Feng Y; Fontenot JD; Rudensky AY
Nat Immunol 2016[Nov]; 17 (11): 1322-33 PMID27595233show ga
Regulatory T (Treg) cells, expressing abundant amounts of the IL-2 receptor (IL-2R), are reliant on IL-2 produced by activated T cells. This feature implied a key role for a simple network based on IL-2 consumption by Treg cells in their suppressor function. However, congenital deficiency in IL-2R results in reduced expression of the Treg cell lineage specification factor Foxp3, confounding experimental efforts to understand the role of IL-2R expression and signaling in Treg suppressor function. Using genetic gain and loss of function approaches, we demonstrate that IL-2 capture is dispensable for control of CD4+ T cells, but is important for limiting CD8+ T cell activation, and that IL-2R dependent STAT5 transcription factor activation plays an essential role in Treg cell suppressor function separable from T cell receptor signaling.