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中国防痨杂志 ›› 2012, Vol. 34 ›› Issue (8): 532-537.

• 论著 • 上一篇    下一篇

结核分枝杆菌Rpf-DNA疫苗对Mtb感染小鼠免疫保护作用的研究

邢爱英 刘忠泉 刘洋 贾红彦 李自慧 郑晓静 曹廷明 杜凤娇 杜博平 古淑香 张宗德   

  1. 101149 北京市结核病胸部肿瘤研究所 首都医科大学附属北京胸科医院 分子生物学实验室
    注:邢爱英、刘忠泉为并列第一作者
  • 收稿日期:2012-05-05 出版日期:2012-08-10 发布日期:2012-08-10
  • 通信作者: 张宗德 E-mail:zzd417@163.com
  • 基金资助:

    国家科技重大专项(2008ZX10003-001);北京卫生人才培养计划(2009-3-51)

Rpf-DNA vaccine for M. tuberculosis infected mice

XING Ai-ying, LIU Zhong-quan, LIU Yang, JIA Hong-yan, LI Zi-hui, ZHENG Xiao-jing,CAO Ting-ming, DU Feng-jiao, DU Bo-ping,GU Shu-xiang,ZHANG Zong-de   

  1. Beijing Tuberculosis and Thoracic Research Institute
  • Received:2012-05-05 Online:2012-08-10 Published:2012-08-10
  • Contact: ZHANG Zong-de E-mail:zzd417@163.com

摘要: 目的  评价Mtb复苏因子DNA疫苗(resuscitation-promoting factor DNA,Rpf-DNA)对Mtb感染宿主的免疫保护作用。 方法  构建复苏因子D(Rpf D-DNA)和复苏因子E(Rpf E-DNA)质粒疫苗,180只BALB/c小鼠(4周龄)分为6组,每组30只,分别用空质粒、Rpf D-DNA质粒、Rpf E-DNA质粒、BCG、生理盐水免疫,H37Rv标准株气溶胶感染。检测血清复苏因子(Rpf)抗体、IFN-γ;RpfD、E刺激淋巴细胞后进行淋巴细胞增殖、细胞杀伤实验;检测细胞上清IFN-γ、IL-12、IL-2;对肺组织进行病理学检测和细菌负荷(CFU)计数。 结果  (1)疫苗免疫组血清Rpf D、Rpf E抗体水平:Rpf D组0.32±0.1,Rpf E组0.39±0.1,BCG组0.02±0.01,空质粒组0.01±0.0,生理盐水组0.09±0.04,空白对照组0.03±0.01,RpfD组与RpfE组抗体水平与BCG组、空质粒组、生理盐水组、空白对照组比较差异有显著统计学意义,F值分别为Rpf D:45.6,43.2,45.1,45.7;Rpf E:51.6,53.6,51.0,52.2;P值均<0.01。血清IFN-γ:Rpf D组(43.9±24.8)pg/ml,Rpf E组(45.9±21.0)pg/ml,BCG组(21.0±11.0)pg/ml,空质粒组(7.9±4.9)pg/ml,生理盐水组(4.7±2.1)pg/ml,空白对照组(5.8±4.7)pg/ml,Rpf D、Rpf E质粒组与BCG组比较差异有统计学意义(F值分别为Rpf D:10.2;Rpf E:12.4;P值均<0.05), 与空质粒组、生理盐水组、空白对照组比较差异有显著统计学意义,F值分别为Rpf D:15.6,17.8,17.3;Rpf E:17.5,21.1,20.7;P值均<0.01。(2)淋巴细胞增殖实验CCK-8:Rpf D组176.0±4.2,Rpf E组183.0±4.3,BCG组101.0±1.1,空质粒组100.0±6.8,生理盐水组104.0±8.4,空白对照组116.0±2.2,RpfD、RpfE质粒组与BCG组、空质粒组、生理盐水组、空白对照组比较差异有统计学意义,F值分别为Rpf D:9.5,10.1,10.0,9.0;Rpf E:11.2,12.9,11.7,10.3;P值均<0.05。细胞杀伤实验:Rpf D组32.0±3.2,Rpf E组30.0±4.2,BCG组16.0±5.9,空质粒组3.3±1.5,生理盐水组6.7±0.5,空白对照组7.3±3.5,Rpf D、Rpf E质粒组与BCG组、空质粒组、生理盐水组、空白对照组比较差异有统计学意义,F值分别为Rpf D:8.8,14.5,13.7,11.9;Rpf E:8.1,12.5,11.6,11.1;P值均<0.05。(3)Rpf D、Rpf E蛋白各自刺激淋巴细胞后上清细胞因子检测:IL-2:Rpf D组9.5±2.4,Rpf E组9.2±1.2,BCG组2.4±2.1,空质粒组1.2±0.3,生理盐水组1.8±1.0,空白对照组1.5±0.7,Rpf D、Rpf E质粒组与其他各组比较差异有统计学意义,F值分别为Rpf D:12.5,14.6,13.5,13.9;Rpf E:12.0,13.6,13.1,13.2;P值均<0.05。IFN-γ:Rpf D组22.2±5.7,Rpf E组28.7±14.4,BCG组16.1±10.1,空质粒组9.8±1.6,生理盐水组13.2±2.1,空白对照组15.7±2.9,RpfD、RpfE质粒组与其他各组比较差异有统计学意义,F值分别为Rpf D:7.8,12.6,8.7,8.3;Rpf E:11.3,16.4,14.7,14.2;P值均<0.05。 结论  实验表明复苏因子疫苗能诱导Mtb感染小鼠产生体液免疫和细胞免疫,有希望成为结核病候选疫苗之一。

关键词: 分枝杆菌, 结核, 细菌蛋白质类, 细胞因子类, 疫苗, DNA

Abstract: Objective  To evaluate the immune protective effect of resuscitation promoting factor (Rpf) DNA vaccine on M. tuberculosis (Mtb) infected mice. Method  Rpf D and Rpf E plasmid DNA vaccines were construct. 180 BALB/c mice with 4 weeks of age were divided into 6 groups, 30 mice each group were immunized with empty plasmid, Rpf D plasmid DNA, Rpf E plasmid DNA, BCG and saline, respectively. All of mice were infected by aerosol with Mtb H37Rv. Serum anti-Rpf D or E antibodies and IFN-γ were detected. The lymphocyte proliferation assay and cytotoxicity test were performed, IFN-γ, IL-12 and IL-2 levels were tested after immunization with RpfD,E DNA vaccine. Histopathologic examination of the lung and CFU count were performed.  Results  (1) The antibody levels against RpfD and E were as follow:Rpf D group 0.32±0.1,Rpf E group 0.39±0.1,BCG group 0.02±0.01,empty plasmid group 0.01±0.0,saline group 0.09±0.04,blank group 0.03±0.01.The antibody levels in RpfD group and E group were significantly higher than those in BCG group,empty plasmid group,  saline group, and blank group (F value: Rpf D:(45.6,43.2,45.1,45.7);Rpf E:(51.6,53.6,51.0,52.2); P<0.01).  Serum IFN-γ levels: Rpf D group (43.9±24.8)pg/ml,Rpf E group (45.9±21.0)pg/ml,BCG group (21.0±11.0)pg/ml,empty plasmid group (7.9±4.9)pg/ml,Saline group (4.7±2.1)pg/ml,blank group (5.8±4.7)pg/ml,Serum IFN-γ levels of RpfD group and E group were higher than empty plasmid group, saline group, and blank group (F value: Rpf D:15.6,17.8,17.3;Serum IFN-γ levels of Rpf E:17.5,21.1,20.7; P<0.01). (2) The lymphocyte proliferation assay using cell counting kit-8 (CCK-8) showed: Rpf D group 176.0±4.2,Rpf E group 183.0±4.3,BCG group 101.0±1.1,empty plasmid group 100.0±6.8,saline group 104.0±8.4,blank group 116.0±2.2, which in vaccine groups were significantly higher than the other controls (F value: Rpf D:9.5,10.1,10.0,9.0;Rpf E:11.2,12.9,11.7,10.3,P<0.05). Cytotoxicity test showed: Rpf D group 32.0±3.2,Rpf E group 30.0±4.2,BCG group 16.0±5.9,empty plasmid group 3.3±1.5,saline group 6.7±0.5,blank group 7.3±3.5. The proliferation index in RpfD group and RpfE group was higher than the other control groups (F value Rpf D:8.8,14.5,13.7,11.9;Rpf E:8.1,12.5,11.6,11.1; P<0.05). (3) Cytokines in the supernatant of lymphocytes stimulated by Rpf D and Rpf E:IL-2 level: Rpf D group 9.5±2.4,Rpf E group 9.2±1.2,BCG group 2.4±2.1,empty plasmid group 1.2±0.3,saline group 1.8±1.0,blank group 1.5±0.7. The IL-2 levels in RpfD group and RpfE group were higher than the other control groups (F value Rpf D:12.5,14.6,13.5,13.9;Rpf E:12.0,13.6,13.1,13.2; P<0.05). IFN-γ level: Rpf D group 22.2±5.7,Rpf E group 28.7±14.4,BCG group 16.1±10.1,empty plasmid group 9.8±1.6,saline group 13.2±2.1,blank group 15.7±2.9. The IFN-γ level in RpfD group and RpfE group were higher than the other control groups(F value Rpf D:7.8,12.6,8.7,8.3;Rpf E:11.3,16.4,14.7,14.2; P<0.05). Conclusion  RpfD and RpfE DNA vaccines can induce immune responses including humoral and cellular immunogenicity in Mtb infected BALB/c mice. Rpf might be used as the vaccine candidate.

Key words: Mycobacterium tuberculosis, Bacterial proteins, Cytokines, Vaccines,DNA