Expression of myeloid-derived suppressor cells in targeted phosphatase of regeneratiing liver-3 mouse breast tumor gene immunity
LYU Juan1 HUANG Hao2 ZHAO Yantian1
1.Department of Clinical Laboratory, Beijing Chaoyang Hospital Affiliated to Capital Medical University, Beijing 100020, China;
2.Key Laboratory of Carcinogenesis and Translational Research, Department of Biochemistry and Molecular Biology, Peking University Cancer Hospital & Institute, Beijing 100142, China
Abstract：Objective To observe the expression of myeloid suppressor cells (MDSC) in targeted phosphatase of regeneratiing liver-3 (PRL-3) mouse breast tumor gene immunity, and to explore the relationship between the number of MDSC and tumor growth. Methods Forty female BALB/c mice were divided into five groups (eight groups): no-load control group (pVAX1 [-] group), adjuvanted PRL-3 group (K-PRL3 group), adjuvanted PRL-3 fusion protein group (K-T-PRL3 group and K-PRL3-MT group), and MDSC control antibody deletion group (K-T-PRL3+Ab control group and K-PRL3-MT+Ab control group). In the MDSC specific antibody deletion group (K-T-PRL3+ GR-1AB group and K-PRL3-MT+ GR-1 Ab group), immunophenotypes CD45, GR-1 and CD11b were detected by flow cytometry to analyze the expression levels of MDSC in peripheral blood, tumor and spleen of each immune group, and the correlation between MDSC and tumor growth was observed. Results On the 28th day after tumor-bearing, the tumor volume of K-PRL3 group, K-T-PRL3 group and K-PRL3-MT group was all smaller than pVAX1 (-) group, with statistically significant differences (all P < 0.05).There was no significant difference in tumor volume between the K-PRL3-mt group and K-T-PRL3 group and K-PRL3 group (P > 0.05). The expression of MDSC in peripheral blood or tumor tissues of the adjuvant -PRL-3 fusion protein group was higher than that of the K-PRL3 group, and the difference was statistically significant (P ＜ 0.05). There was no significant difference in tumor volume between MDSC specific antibody deletion group (K-T-PRL3 + GR-1 Ab group and K-PRL3-mL + GR-1 Ab group) and MDSC Control group (K-T-PRL3 +Ab control group and K-PRL3-MT +Ab control group) (P ＞ 0.05). The tumor volume of the MDSC specific antibody deletion group and the MDSC control antibody deletion group were all larger than those of the adjuvant-free PRL-3 group and the adjuvant-PRL-3 fusion protein group, with statistically significant differences (P ＜ 0.01). The expression of MDSC in spleen and peripheral blood of the MDSC specific antibody deletion group was lower than that of the control antibody deletion group, while the difference between the expression of MDSC in tumor tissues and that of the MDSC control antibody deletion group was not statistically significant (P ＞ 0.05), and was greater than that of the adyuvanted-PRL-3 fusion protein group, with statistically significant difference (P ＜ 0.01). Conclusion MDSC in tumor tissues in the adjuvant-PRL-3 fusion protein group is correlated with tumor growth in breast tumor by DNA vaccination against PRL-3, providing a theoretical basis for further optimization of anti-tumor immunotherapy against PRL-3 and research on the related effects of MDSC.
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2020, Vol. 17 
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