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http://dx.doi.org/10.14348/molcells.2018.0040

Tristetraprolin Overexpression in Gastric Cancer Cells Suppresses PD-L1 Expression and Inhibits Tumor Progression by Enhancing Antitumor Immunity  

Guo, Jian (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Qu, Huiheng (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Shan, Ting (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Chen, Yigang (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Chen, Ye (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Xia, Jiazeng (Department of General Surgery and Center of Translational Medicine, The Affiliated Wuxi No.2 People's Hospital of Nanjing Medical University)
Publication Information
Molecules and Cells / v.41, no.7, 2018 , pp. 653-664 More about this Journal
Abstract
The RNA-binding protein tristetraprolin (TTP) binds to adenosine-uridine AU-rich elements in the 3'-untranslated region of messenger RNAs and facilitates rapid degradation of the target mRNAs. Therefore, it regulates the expression of multiple cancer and immunity-associated transcripts. Furthermore, a lack of TTP in cancer cells influences cancer progression and predicts poor survival. Although the functions of TTP on cancer cells have previously been researched, the mechanism of TTP on the interaction between cancer cells with their micro-environment remains undiscovered. In this study, we admed to determine the role of cancer cell TTP during the interaction between tumor and immune cells, specifically regulatory T cells (Tregs). We evaluate the capability of TTP to modulate the antitumor immunity of GC and explored the underlying mechanism. The overexpression of TTP in GC cells dramatically increased peripheral blood mononuclear lymphocyte (PBML) -mediated cytotoxicity against GC cells. Increased cytotoxicity against TTP-overexpressed GC cells by PBMLs was determined by Treg development and infiltration. Surprisingly, we found the stabilization of programmed death-ligand 1 (PD-L1) mRNA was declining while TTP was elevated. The PD-L1 protein level was reduced in TTP-abundant GC cells. PD-L1 gas been found to play a pivotal role in Treg development and functional maintenance in immune system. Taken together, our results suggest the overexpression of TTP in GC cells not only affects cell survival and apoptosis but also increases PBMLs -mediated cytotoxicity against GC cells to decelerate tumor progression. Moreover, we identified PD-L1 as a critical TTP-regulated factor that contributes to inhibiting antitumor immunity.
Keywords
immunity; PD-L1; Tregs; tristetraprolin; tumor progression;
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