Abstract
Accumulating evidences demonstrate that a population of suppressive cells known as myeloid-derived suppressor cells (MDSCs) is key immune modulators which suppress antitumor immunity. In this study, we found that the level of circulating CD14+HLA-DR−/low cells in patients was significantly higher than that of healthy donors and was correlated with tumor burden, lymph node metastasis, and tumor, node, and metastasis (TNM) clinical stage. More importantly, we for the first time find the level of CD14+HLA-DR−/low is a biological indicator of poor prognosis through the analysis of 3-year overall survival. Furthermore, we evidenced that the proportion of CD14+HLA-DR−/low cells in the tumor metastatic tumor-draining lymph nodes (TDLNs) was notably higher compared to tumor-free TDLNs. Additionally, CD14+HLA-DR−/low cells from esophageal squamous cell carcinoma (ESCC) patients expressed dramatically increased programmed death ligand 1 (PD-L1) comparing to that from healthy control. Subsequently, blocking PD-L1 pathway by antibody could effectively reverse the suppressive effect on autologous T cell proliferation mediated by CD14+HLA-DR−/low cells in vitro. In conclusion, our data revealed CD14+HLA-DR−/low MDSCs which increase in ESCC patients is a novel poor prognostic indicator and may exert immunosuppressive properties through PD-L1/PD-1 pathway.
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Abbreviations
- MDSCs:
-
Myeloid-derived suppressor cells
- ESCC:
-
Esophageal squamous cell carcinoma
- PD-L1:
-
Programmed death ligand 1
- TDLNs:
-
Tumor-draining lymph nodes
- PBMCs:
-
Peripheral blood mononuclear cells
- ARG-1:
-
Arginase-1
- ROS:
-
Reactive oxygen species
- iNOS:
-
Inducible nitric oxide synthase
- TGF-β:
-
Transforming growth factor β
- Tregs:
-
Regulatory T cells
- PIR-B:
-
Paired immunoglobulin-like receptors B
- CFSE:
-
Carboxyfluorescein succinimidyl ester
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grants 31300746 to H.H., 81372276 to G.Z., 31320103918 to X.Z.), the Natural Science Foundation of Jiangsu (Grant BK20131158 to G.Z.), and by the Natural Science Foundation of Suzhou (Grant SYS201323 to H.H.).
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Haitao Huang and Guangbo Zhang contributed equally to this work.
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Huang, H., Zhang, G., Li, G. et al. Circulating CD14+HLA-DR−/low myeloid-derived suppressor cell is an indicator of poor prognosis in patients with ESCC. Tumor Biol. 36, 7987–7996 (2015). https://doi.org/10.1007/s13277-015-3426-y
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DOI: https://doi.org/10.1007/s13277-015-3426-y