Li, Congcong Zhang, Xiaoxin Kang, Xiaomin Chen, Chao Guo, Feng Wang, Qiaohong Zhao, Aimin Image_1_Upregulated TRAIL and Reduced DcR2 Mediate Apoptosis of Decidual PMN-MDSC in Unexplained Recurrent Pregnancy Loss.TIF <p>Myeloid-derived suppressor cells (MDSC), especially polymorphonuclear MDSC (PMN-MDSC), accumulate in maternal-fetal interface during pregnancy and are involved in the maintenance of immune tolerance. Decreased PMN-MDSC is associated with pregnancy complications such as unexplained recurrent pregnancy loss (URPL). In the present study we showed decreased PMN-MDSC in the URPL group compared with the normal pregnancy (NP) group, and PMN-MDSC was the major subset of MDSC in human decidua with potent immune suppression activity. We then performed gene expression profile and found that human decidual PMN-MDSC in the NP and URPL groups showed different gene and pathway signature, including apoptosis. Apoptosis of decidual PMN-MDSC was mediated by TNF-related apoptosis–induced ligand (TRAIL) in a Caspase 3 dependent manner. TRAIL was expressed in decidua and upregulated in decidua of the URPL group. Notably, of all the membrane TRAIL receptors, only DcR2 was down-regulated in PMN-MDSC in the URPL group. In vitro experiment demonstrated that DcR2 blockade sensitized PMN-MDSC to TRAIL-mediated apoptosis. Together, these data indicate that increased TRAIL and reduced DcR2 on PMN-MDSC sensitize PMN-MDSC response to TRAIL-induced apoptosis in the URPL group, which is responsible for decreased accumulation of PMN-MDSC in URPL.</p> polymorphonuclear myeloid-derived suppressor cell;TRAIL;TRAIL receptor;apoptosis;unexplained recurrent pregnancy loss 2020-06-30
    https://frontiersin.figshare.com/articles/figure/Image_1_Upregulated_TRAIL_and_Reduced_DcR2_Mediate_Apoptosis_of_Decidual_PMN-MDSC_in_Unexplained_Recurrent_Pregnancy_Loss_TIF/12585863
10.3389/fimmu.2020.01345.s002