151. Increased circulating Lin−/low CD33+ HLA-DR− myeloid-derived suppressor cells in hepatocellular carcinoma patients.
- Author
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Shen, Peng, Wang, Aijuan, He, Mengye, Wang, Qingqing, and Zheng, Shusen
- Subjects
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HLA histocompatibility antigens , *CD antigens , *LIVER cancer , *MYELOID leukemia , *SUPPRESSOR cells , *CANCER patients - Abstract
Aim Myeloid-derived suppressor cells ( MDSC) can be induced or expanded in tumor-bearing mice and cancer patients. The frequency of MDSC denoted here as Lin−/low CD33+ HLA-DR− was investigated in hepatocellular carcinoma ( HCC) patients. The clinical relevance of MDSC and patients' characteristics were examined. Also, MDSC-related immune regulatory pathways in these patients were discussed. Methods The quantity of MDSC was tested in peripheral blood of patients with HCC ( n = 63) and healthy donors ( n = 56). The expressions of interferon ( IFN)-γ, vascular endothelial growth factor ( VEGF), cyclooxygenase ( COX)-2, matrix metalloproteinase ( MMP)-13, nitric oxide synthase ( NOS)-2 and arginase ( ARG)-1 were analyzed. Co-culturing with anti- CD3/ CD28-stimulated T lymphocytes was used to determine the suppressive effect of MDSC on the T lymphocytes. Results Patients with treatment-naive HCC had an increased subpopulation of Lin−/low CD33+ HLA-DR− cells in the peripheral blood mononuclear cells ( PBMC) with characteristics of MDSC and associated to the stage ( P = 0.0004). Patients with splenomegaly had a higher frequency of circulating MDSC. Also, COX-2, MMP-13 and VEGF were expressed differently associated with the alteration of MDSC. Conclusion Our study provides evidence showing an increased population of Lin−/low CD33+ HLA-DR− MDSC in the peripheral blood of HCC patients. Our data also suggest that MMP-13 and COX-2 in PBMC may play a new important role companied with MDSC in HCC patients. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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