文章基本信息

标题：PD-L1+MDSCs are increased in HCC patients and induced by soluble factor in the tumor microenvironment
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作者：Tomoaki Iwata ; Yasuteru Kondo ; Osamu Kimura 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：6
期号：1
DOI：10.1038/srep39296
语种：English
出版社：Springer Nature
摘要：Myeloid-derived suppressor cells (MDSCs) could have important roles in immune regulation, and MDSCs can be induced in patients with various malignant tumors. The immune-suppressive functions of MDSCs in hepatocellular carcinoma (HCC) patients have not been clarified. Therefore, we tried to analyze the biological significance of MDSCs in HCC patients. We quantified PD-L1(+)MDSCs of HCC patients in various conditions by using multi-color flow cytometry analysis. PBMCs from HCC patients contained significantly higher percentages of PD-L1(+)MDSCs in comparison to those from healthy subjects (p < 0.001). The percentages of PD-L1(+)MDSCs were reduced by curative treatment for HCC (p < 0.05), and the percentages of PD-L1(+)MDSCs before treatment were inversely correlated with disease-free survival time. After we cocultivated PBMCs and several liver cancer cell lines in a transwell coculture system, the percentages of PD-L1(+)MDSCs were significantly increased compared with control (p < 0.05). The expression of M-CSF and VEGFA was higher in the cell lines that strongly induced PD-L1(+)MDSCs. Peripheral blood from HCC patients had significantly higher percentages of PD-L1(+)MDSCs in comparison to those of healthy subjects, and the percentages of PD-L1(+)MDSCs were reduced by HCC treatment, suggesting that we might use PD-L1(+)MDSCs as a new biomarker of HCC.