中国寄生虫学与寄生虫病杂志 ›› 2011, Vol. 29 ›› Issue (2): 6-111-116.

• 论著 • 上一篇    下一篇

细粒棘球蚴重组抗原B诱导小鼠骨髓源树突状细胞表达吲哚胺2,3-双加氧酶的研究

单骄宇1,2,纪卫政1,吐尔洪江·吐逊1,李亮1,张传山1,林仁勇1,温浩1 *   

  1. 1 新疆医科大学第一附属医院新疆包虫病基础医学实验室,乌鲁木齐 830054;2 新疆医科大学基础医学院人体寄生虫学教研室,乌鲁木齐 830054
  • 出版日期:2011-04-30 发布日期:2012-09-27

Echinococcus granulosus Recombinant Antigen B Induced IDO Expression in Mouse Bone Marrow-derived Dendritic Cells In Vitro

SHAN Jiao-yu1,2,JI Wei-zheng1,Turgun Tursun1,LI Liang1,ZHANG Chuan-shan1,LIN Ren-yong1,WEN Hao1 *   

  1. 1 Xinjiang Laboratory of Hydatid Fundamental Medicine,the First Affiliated Hospital;2 Department of Parasitology,School of Basic Medicine,Xinjiang Medical University,Urumqi 830054,China
  • Online:2011-04-30 Published:2012-09-27

摘要: 目的  观察细粒棘球蚴重组抗原B (rAgB)体外诱导小鼠骨髓源树突状细胞表达吲哚胺2,3-鄄双加氧酶(IDO)的情况。 方法  从小鼠股骨中分离出骨髓细胞,进行小鼠重组巨噬细胞集落刺激因子(rmGM-CSF)的诱导,培养并获得CD11c+ 树突状细胞。应用倒置显微镜和扫描电镜观察树突状细胞形态,采用流式细胞术检测其表面标志物;用混合淋巴细胞反应(MLR)观察树突状细胞对T淋巴细胞的增殖能力。培养至第6天,收集未成熟树突状细胞进行流式细胞术检测;另向部分未成熟树突状细胞中加脂多糖(LPS)刺激24 h后,收集成熟树突状细胞,进行流式细胞术检测。在获得的未成熟树突状细胞中分别加入RPMI 1640完全培养液(为阴性对照组)、 重组小鼠γ干扰素(rmIFN-γ,1 000 U/ml,为IFN-γ组)和rAgB(终浓度15 μg/ml, 为rAgB组), 培养24 h后, 通过细胞免疫组织化学和蛋白质印迹(Western blotting)检测各组树突状细胞IDO的表达情况。 结果  获得纯度为80%的CD11c+ 树突状细胞,在倒置显微镜和扫描电镜下均观察到典型树突状细胞。经LPS刺激的成熟树突状细胞的CD40、CD80和主要组织相容性复合体(MHC)Ⅱ类分子IA/IE的阳性表达率与未成熟树突状细胞的相比,差异均有统计学意义(均P<0.05)。MLR结果显示,诱导形成的树突状细胞具有刺激T淋巴细胞增殖的能力。细胞免疫组织化学方法检测结果显示,阴性对照组、阳性对照组和rAgB组的IDO阳性表达率分别为(4.544±1.752)%、(20.464±4.452)%和(11.148±1.966)%, 3组间的差异均有统计学意义(均P<0.05)。Western blotting结果表明,3组IDO蛋白与相应甘油醛-3-磷酸脱氢酶(GAPDH)蛋白的灰度值之比分别为(0.229±0.085)、 (0.794±0.114)和(0.573±0.129), 其中rAgB组与阴性对照组相比差异有统计学意义(P<0.05),与IFN-γ组相比差异无统计学意义(P>0.05)。 结论  细粒棘球蚴重组抗原B在体外具有诱导树突状细胞表达吲哚胺2,3-双加氧酶的功能。

关键词: 细粒棘球蚴重组抗原B, 树突状细胞, 吲哚胺2,3-双加氧酶, 免疫耐受

Abstract: Objective   To observe the expression of indoleamine 2,3-dioxygenase (IDO) in mouse bone marrow-derived dendritic cells (DCs) after adding Echinococcus granulosus recombinant antigen B (rAgB) in vitro.  Methods  CD11c+ DCs generated from bone marrow precursor cells of C57BL/6 mice and cultured in the presence of recombinant mouse GM-CSF (rmGM-CSF). The morphology of DCs was observed by inverted microscope and scanning electronic microscope. The level of IA/IE,CD40,CD80,and CD86 on DCs were determined by flow cytometry. T cell proliferation induced by DCs were evaluated by using mixed lymphocyte reaction (MLR) assay. At day 6 postculture, the immature DCs were collected, and part of the immature DCs stimulated with lipopolysaccharide (LPS) for 24 h were examined by flow cytometry. Immature DCs were divided into 3 groups: negative control group,positive control group (rmIFN-γ,1 000 U/ml) and rAgB group. Immature DCs of positive control group and rAgB group were induced with 1 000 U/ml rmIFN-γ and 15 μg/ml rAgB,respectively. IDO expression in DCs was examined 24 h after induction using immunohistochemical method and Western blotting.  Results   More than 80% CD11c+ DCs were harvested. The typical DCs were observed under inverted microscope and scanning electronic microscope. The level of CD40, CD80, and IA/IE(MHCⅡ) in mature DCs group was significantly higher than that of immature DCs group (P<0.05). In MLR,mitomycin-treated DCs can stimulate T lymphocytes proliferation activity. There were significantly differences in IDO expression in the negative control group [(4.544±1.752)%], positive control group [(20.464±4.452)%] and rAgB group [(11.148±1.966)%] (P<0.05). Western blotting result indicated that the ratio of IDO/GAPDH in rAgB group (0.573±0.129) was significantly higher than that of negative group (0.229±0.085) (P<0.05), and there were no significant difference in the ratio of IDO/GAPDH between IFN-γ group (0.794±0.114) and rAgB group (P>0.05).   Conclusion   rAgB can induce IDO expression in bone marrow-derived dendritic cells in vitro.

Key words: Echinococcus granulosus recombinant antigen B, Dendritic cells, Indoleamin 2,3-dioxygenase, Immune tolerance