CD44+CD24-/low sphere-forming cells of EBV-associated gastric carcinomas show immunosuppressive effects and induce Tregs partially through production of PGE2.

CD44+CD24-/low sphere-forming cells of EBV-associated gastric carcinomas show immunosuppressive effects and induce Tregs partially through production of PGE2. Exp Cell Res. 2020 Mar 17;:111968 Authors: Hui D, Chen J, Jiang Y, Pan Y, Zhang Z, Dong M, Shao C Abstract EBV-associated gastric carcinoma (EBVaGC) is accompanied by massive lymphocyte infiltration, but therapy resistance and tumor progression still occur in patients with EBVaGC. Cancer stem cells (CSCs) are reported to possess immunomodulatory ability that allows them to resist immune-mediated rejection for many tumor types. However, whether and how CSCs in EBVaGC exhibit immunosuppression has not yet been elucidated. We isolated CSC-like sphere-forming cells (SFCs) from EBVaGC cell line SNU-719 using the cancer sphere method. We validated their CSC-associated properties in the expression of the epithelial-mesenchymal transition (EMT)-related genes, the ability to form colonies, and resistance to chemotherapy drug-induced apoptosis and explored their immunomodulatory ability using the coculture system with PBMC (peripheral blood mononuclear cell). These CSC-like SFCs were CD44+CD24-/low and were more tumorigenic than the parental SNU-719 cells in the xenograft mouse model. Remarkably, in the tumor-PBMC co-culturing experiments, these EBVaGC SFCs demonstrated profound immunosuppression by inhibiting the proliferation of PBMCs and T cell activation as well as inducing the gen...
Source: Experimental Cell Research - Category: Cytology Authors: Tags: Exp Cell Res Source Type: research