TNFRSF18 and Sjogren syndrome: Our previous study has shown MDSCs from experimental Sjögren’s syndrome (ESS) mice could express GITR, and triggering GITR on MDSCs by GITRL significantly reduced the suppressive function of MDSCs on CD4+ T-cell proliferation, and the suppressive factors secreted by MDSCs, including arginase and NO, were also down-regulated.