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Deprecated: Implicit conversion from float 298.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2012 ; 188 (9): 4226-34 Nephropedia Template TP
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Functional changes in myeloid-derived suppressor cells (MDSCs) during tumor growth: FKBP51 contributes to the regulation of the immunosuppressive function of MDSCs #MMPMID22474024
Kim YS; Kim YJ; Lee JM; Kim EK; Park YJ; Choe SK; Ko HJ; Kang CY
J Immunol 2012[May]; 188 (9): 4226-34 PMID22474024show ga
Myeloid-derived suppressor cells (MDSCs) are increased by tumor-derived factors and suppress anti-tumor immunity. MDSCs obtained at a late time point after tumor injection had stronger suppressive activity than MDSCs obtained at an early time point, as measured by T cell proliferation assays. To find factors in MDSCs that change during tumor growth, we analyzed gene expression profiles from MDSCs at different time points after tumor injection. We found that immune response-related genes were downregulated but protumor function-related genes were upregulated in both monocytic MDSCs (Mo-MDSCs) and polymorphonuclear granulocytic MDSCs (PMN-MDSCs) at the late time point. Among differentially expressed genes, FK506 binding protein 51 (FKBP51), which is a member of the immunophilin protein family and plays a role in immunoregulation, was increased in the Mo-MDSCs and PMN-MDSCs isolated from the late time points. Experiments using small interfering RNA and a chemical inhibitor of FKBP51 revealed that FKBP51 contributes to the regulation of the suppressive function of MDSCs by increasing inducible NO synthase, arginase-1, and reactive oxygen species levels and enhancing NF-kappaB activity. Collectively, our data suggest that FKBP51 is a novel molecule that can be targeted to regulate the immunosuppressive function of MDSCs.