畜牧兽医学报 ›› 2009, Vol. 40 ›› Issue (6): 892-897.

• 预防兽医 • 上一篇    下一篇

布鲁氏菌VirB8变异株的构建及其感染力和毒力的测定

钟旗1,2,何倩倪1,范伟兴3,谷文喜1
易新萍4,吴冬玲1,叶锋1,李博1 ,刘丽娅1
  

  1. 1.新疆畜牧科学院兽医研究所,乌鲁木齐 830000;2.东北农业大学动物医学学院,哈尔滨 150030;3.中国动物卫生与流行病学中心,青岛 266032;4.新疆自治区产品质量监督检验研究院,乌鲁木齐 830002
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-06-26 发布日期:2009-06-26
  • 通讯作者: 钟旗

Construction of VirB8 Deletion Mutants of Brucella and Detection of Its Infection and Virulence

ZHONG Qi 1,2 , HE Qianni 1, FAN Weixing 3, GU Wenxi 1,
YI Xinping 4,WU Dongling 1,YE Feng 1,LI Bo 1,LIU Liya 1
  

  1. 1.Veterinary Research Institute,Xinjiang Academy of Animal Sciences,Urumqi 830000,China;2.College of Veterinary Medicine,Northeast Agricultural University,Harbin 150030,China;3.China Animal Health and Epidemiology Center,Qingdao 266032,China;4.Xinjiang Product Quality Supervision and Inspection Academy,Urumqi 830002,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-06-26 Published:2009-06-26
  • Contact: ZHONG Qi

摘要: 作者拟对缺失致病力因子——四型分泌系统中的VirB8基因后布鲁氏菌感染力和毒力的变化进行测定与分析。 首先,构建了布鲁氏菌VirB8基因缺失株(△B8B.suis),用缺失株感染巨噬细胞和BALB/c小鼠,再用B.suis强毒攻击BALB/c小鼠并检测脾脏含菌数,观察其在动物体内定居能力、毒力及抗感染保护力。鉴定△B8B.suis为VirB8基因完全缺失株,△B8B.suis感染巨噬细胞6、24和48 h,其CFU分别为49、165和355;△B8B.suis感染BALB/c小鼠的每克脾含菌数为36×107(1×108CFU腹腔接种)和5×106(1×109CFU蹊部接种);BALB/c小鼠攻毒试验显示△B8Bsuis免疫组每克脾平均含菌数为761×102,非免疫对照组为298×105。结果表明布鲁氏菌缺失VirB8基因后,其毒力较亲本株弱,但能在小鼠脾脏定居,为弱毒株;△B8Bsuis呈现出作为疫苗的生物学特性,但毒株能否作为疫苗株使用,还需进一步验证。

关键词: 布鲁氏菌, 致病因子, 毒力, 保护力

Abstract: VirB8 deletion mutant of Brucella was constructed and named △B8B.suis. Then the virulence and potential protection efficacy of the △B8B.suis were evaluated by inoculating macrophages and BALB/c mouse. After culturing in macrophages, bacteria were recovered 6, 24, 48 h, and the mean CFU were 49, 165 and 355 respectively. Splenic CFU of BALB/c mouse were 36×107 (Mice was inoculated with 1×108CFU in abdominal cavity) and 56×105 (Mice was inoculated with 1×109CFU in inguinal region). After challenging, the splenic CFU of △B8B.suis immunization group was 761×102,while that of control group (No inoculation) was 298×105. The mutation of △B8B.suis was attenuated in macrophages and mouse model. It was able to colonize in spleen of BALB/c mouse and had some protective efficacy against Brucella suis. This approach provides a useful candidate vaccine for protecting animals from Brucella infection.

Key words: Brucella, pathogenicity, virulence, protective efficacy