中国寄生虫学与寄生虫病杂志

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细粒棘球蚴感染小鼠髓源抑制性细胞与Th17细胞比例的变化

于爱萍,尹建海,巩文词,曹胜魁,曹建平,沈玉娟*   

  1. 中国疾病预防控制中心寄生虫病预防控制所,国家热带病研究中心,世界卫生组织热带病合作中心,科技部国家级热带病国际联合研究中心,卫生部寄生虫病原与媒介生物学重点实验室,上海 200025
  • 出版日期:2018-06-30 发布日期:2018-07-02

Changes of myeloid-derived suppressor cells and Th17 cells in mice infected with Echinococcus granulosus protoscoleces

YU Ai-ping, YIN Jian-hai, GONG Wen-ci, CAO Sheng-kui, CAO Jian-ping, SHEN Yu-juan*   

  1. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; Chinese Center for Tropical Diseases Research; WHO Collaborating Centre for Tropical Diseases; National Center for International Research on Tropical Diseases, Ministry of Science and Technology; Key Laboratory of Parasite and Vector Biology, Ministry of Health, Shanghai 200025, China
  • Online:2018-06-30 Published:2018-07-02

摘要:

目的 分析细粒棘球蚴感染小鼠体内髓源抑制性细胞(MDSCs)和Th17细胞比例的变化及意义。 方法 将20只6周龄雌性BALB/c小鼠随机分为感染组和对照组,每组10只。感染组每只小鼠腹腔注射细粒棘球绦虫原头节约2 000个,对照组注射等体积生理盐水。感染后8个月(感染晚期)收集感染组和对照组小鼠脾脏细胞、外周血白细胞和腹腔细胞,采用流式细胞术检测小鼠MDSCs及其亚型(M-MDSCs、PMN-MDSCs)和Th17细胞比例,采用Pearson相关性分析MDSCs、M-MDSCs、PMN-MDSCs与Th17细胞比例的相关关系。 结果 感染组小鼠脾脏细胞、外周血白细胞、腹腔细胞中MDSCs比例分别为(14.72 ± 4.27)%、(57.04 ± 6.78)%和(15.35 ± 5.56)%,对照组分别为(8.84 ± 2.12)%、(30.53 ± 1.58)%和(1.74 ± 0.63)%,感染组与对照组相比差异均有统计学意义(P < 0.05);感染组小鼠脾脏细胞、外周血白细胞、腹腔细胞中M-MDSCs比例分别为(1.29 ± 0.24)%、(6.27 ± 2.11)%、(2.14 ± 0.94)%,对照组分别为(0.72 ± 0.25)%、(2.11 ± 1.27)%、(0.25 ± 0.06)%,感染组与对照组相比差异均有统计学意义(P < 0.05);感染组小鼠脾脏细胞、外周血白细胞、腹腔细胞中PMN-MDSCs比例分别为(9.31 ± 2.65)%、(46.72 ± 5.67)%、(7.06 ± 2.36)%,对照组分别为(7.07 ± 3.20)%、(25.42 ± 2.05)%、(1.08 ± 0.40)%,感染组与对照组间外周血白细胞和腹腔细胞的PMN-MDSCs比例差异有统计学意义(P < 0.05)。感染组小鼠脾脏细胞、外周血白细胞、腹腔细胞中Th17细胞比例分别为(1.31 ± 0.38)%、(1.85 ± 0.77)%和(2.90 ± 0.24)%,对照组分别为(0.59 ± 0.07)%、(0.35 ± 0.15)%和(0.41 ± 0.12)%,感染组与对照组相比差异均有统计学意义(P < 0.05)。Pearson相关性分析结果显示,感染组小鼠脾脏、外周血和腹腔细胞中MDSCs与Th17细胞比例之间无相关关系(r = -0.354、-0.746、0.801,P > 0.05),感染组小鼠脾脏M-MDSCs与Th17细胞比例呈负相关关系(r = -0.896,P < 0.05)。 结论 在细粒棘球蚴感染小鼠8个月后MDSCs与Th17细胞比例均增加,感染组小鼠脾脏M-MDSCs与Th17细胞比例呈负相关关系。

关键词: 细粒棘球绦虫, 原头节, 髓源抑制性细胞, Th17

Abstract:

Objective To investigate the changes of the myeloid-derived suppressor cells (MDSCs) and T helper 17 (Th17) cells in mice infected with Echinococcus granulosus protoscoleces and its implications. Methods Twenty female BALB/c mice of 6 weeks were randomly divided into the infection and normal control groups, each with 10 mice. The mice in the infected group were intraperitoneally injected with 2 000 protoscoleces, and those in the control group were injected with a same volume of normal saline. Spleen cells, peripheral blood leukocytes, and peritoneal cells were collected eight months after infection, in which the percentages of MDSCs, their subpopulations (M-MDSCs and PMN-MDSCs) and Th17 cells were assessed by flow cytometry. The correlations of MDSCs and their subpopulations with Th17 cells were determined by the Pearson correlation analysis.  Results In the infection group, the proportion of MDSCs in spleen cells, peripheral blood leukocytes, and peritoneal cells were(14.72 ± 4.27)%, (57.04 ± 6.78)% and(15.35 ± 5.56)%, respectively, all significantly higher than those in the control group [(8.84 ± 2.12)%, (30.53 ± 1.58)% and (1.74 ± 0.63)%, respectively] (P < 0.05). In the infection group, the proportion of M-MDSCs in spleen cells, peripheral blood leukocytes, and peritoneal cells were (1.29 ± 0.24)%, (6.27 ± 2.11)% and(2.14 ± 0.94)%, respectively, all significantly higher than those in the control group[(0.72 ± 0.25)%, (2.11 ± 1.27)%, (0.25 ± 0.06)%](P < 0.05). The proportion of PMN-MDSCs in spleen cells, peripheral blood leukocytes, and peritoneal cells were (9.31 ± 2.65)%, (46.72 ± 5.67)%, (7.06 ± 2.36)% in the infection group, and were (7.07 ± 3.20)%, (25.42 ± 2.05)%, (1.08 ± 0.40)% in the control group, the proportion of PMN-MDSCs in peripheral blood leukocytes and peritoneal cells in infected group were higher than those in control group(P < 0.05). In the infection group, the percentages of Th17 cells in spleen cells, peripheral blood leukocytes, and peritoneal cells were (1.31 ± 0.38)%, (1.85 ± 0.77)% and (2.90 ± 0.24)%, respectively, all significantly higher than those in the control group [(0.59 ± 0.07)%, (0.35 ± 0.15)% and (0.41 ± 0.12)%, respectively] (P < 0.05). Pearson correlation analysis showed that there was no correlation between percentages of Th17 and MDSCs in the spleen cells, peripheral blood leukocytes, and peritoneal cells in the infection group (r = -0.354, -0.746, 0.801; P > 0.05), while the monocytic MDSCs percentage was negatively correlated with Th17 cells in spleen in the infection group (r = -0.896, P < 0.05).  Conclusions The percentage of MDSCs and Th17 cells are both increased in mice at late stage of E. granulosus infection, and may play important roles in the development of echinococcosis.

Key words:  Echinococcus granulosus, Protoscoleces, Myeloid-derived suppressor cells, Th17