Wu, ChuanChen, ZuojiaXiao, ShengThalhamer, TheresaMadi, AsafHan, TimothyKuchroo, Vijay2018-03-202018Wu, Chuan, Zuojia Chen, Sheng Xiao, Theresa Thalhamer, Asaf Madi, Timothy Han, and Vijay Kuchroo. 2018. “SGK1 Governs the Reciprocal Development of Th17 and Regulatory T Cells.” Cell reports 22 (3): 653-665. doi:10.1016/j.celrep.2017.12.068. http://dx.doi.org/10.1016/j.celrep.2017.12.068.http://nrs.harvard.edu/urn-3:HUL.InstRepos:35015032SUMMARY A balance between Th17 and regulatory T (Treg) cells is critical for immune homeostasis and tolerance. Our previous work has shown Serum- and glucocorticoid-induced kinase 1 (SGK1) is critical for the development and function of Th17 cells. Here, we show that SGK1 restrains the function of Treg cells and reciprocally regulates development of Th17/Treg balance. SGK1 deficiency leads to protection against autoimmunity and enhances self-tolerance by promoting Treg cell development and disarming Th17 cells. Treg cell-specific deletion of SGK1 results in enhanced Treg cell-suppressive function through preventing Foxo1 out of the nucleus, thereby promoting Foxp3 expression by binding to Foxp3 CNS1 region. Furthermore, our data suggest that SGK1 also plays a critical role in IL-23R-mediated inhibition of Treg and development of Th17 cells. Therefore, we demonstrate that SGK1 functions as a pivotal node in regulating the reciprocal development of pro-inflammatory Th17 and Foxp3+ Treg cells during autoimmune tissue inflammation.en-USJournal Article2018-03-2010.1016/j.celrep.2017.12.068