畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (3): 1268-1277.doi: 10.11843/j.issn.0366-6964.2024.03.038

• 基础兽医 • 上一篇    下一篇

牛支原体兔体攻毒模型的建立

武文英1,2,3, 夏青1, 胡萌婕1, 赵逸轩1, 王琛1,2,3, 张宇豪1,2,3, 郝成武4, 贺笋4, 郭爱珍1,2,3, 陈建国1,2, 陈颖钰1,2,3*   

  1. 1. 华中农业大学动物科学技术学院动物医学院, 武汉 430070;
    2. 华中农业大学生猪健康养殖协同创新中心, 武汉 430070;
    3. 华中农业大学农业微生物资源发掘与利用国家重点实验室, 武汉 430070;
    4. 天康生物制药有限公司, 乌鲁木齐 830011
  • 收稿日期:2023-06-12 出版日期:2024-03-23 发布日期:2024-03-27
  • 通讯作者: 陈颖钰,主要从事动物流行病学、牛主要疾病致病机制、诊断方法及疫苗研发,E-mail:chenyingyu@mail.hzau.edu.cn
  • 作者简介:武文英(1998-),女,河南郑州人,硕士,主要从事临床兽医学研究,E-mail:wwy.11@outlook.com
  • 基金资助:
    宁夏回族自治区重点研发计划项目(2023BCF01038);国家现代农业(肉牛/牦牛)产业技术体系(CARS-37)

Establishment of Rabbit Challenge Model of Mycoplasma bovis

WU Wenying1,2,3, XIA Qing1, HU Mengjie1, ZHAO Yixuan1, WANG Chen1,2,3, ZHANG Yuhao1,2,3, HAO Chengwu4, HE Sun4, GUO Aizhen1,2,3, CHEN Jianguo1,2, CHEN Yingyu1,2,3*   

  1. 1. College of Animal Sciences & Technology/College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China;
    2. The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China;
    3. State Key Laboratory of Agricultural Microbial Resources Exploitation and Utilization, Huazhong Agricultural University, Wuhan 430070, China;
    4. Tiankang Biopharmaceutical Co., Ltd., Urumqi 830011, China
  • Received:2023-06-12 Online:2024-03-23 Published:2024-03-27

摘要: 牛支原体是引起牛呼吸疾病综合征(bovine respiratory disease,BRD)的重要病原之一,对养牛业造成了不可估量的经济损失。牛支原体对大多数抗生素都具有耐药性,目前没有较好的药物可以进行治疗,因此疫苗免疫是最有效的防控方法。缺乏小动物评价模型是牛支原体疫苗研发的重要制约因素之一。建立小动物攻毒模型,为后续疫苗的研究与制备提供一定的研究基础,并降低后续试验的科研成本。为建立牛支原体小动物感染模型,本研究以2月龄日本大耳白兔作为研究对象,分为4组:1)单独攻击HB0801株牛支原体,2)注射地塞米松后攻击HB0801株牛支原体,3)攻击HB0801株牛支原体后注射KLH和巯基乙酸盐培养基;4)空白对照组。通过PCR检测牛支原体排菌情况,检测血清中抗体水平,第31天后取肺制作病理切片。研究结果显示,注射地塞米松后攻击HB0801株牛支原体组的牛支原体检出率和抗体均最高,牛支原体检出率为42.11%,91.67%的动物被检测为抗体阳性。显著高于其它各组。除空白对照组外,其它攻毒组均出现了肺泡壁增厚,巨噬细胞浸润以及肺部不同程度的纤维素性渗出,符合牛支原体导致的间质性肺炎的病变特征。本研究建立了牛支原体HB0801株攻毒日本大耳白兔的感染及评价模型,地塞米松造成免疫抑制后攻毒HB0801株具有最好的造模效果。

关键词: 牛支原体, 动物模型, 兔, 地塞米松

Abstract: Mycoplasma bovis is one of the important pathogens causing bovine respiratory disease syndrome (BRD), which has caused immeasurable economic losses to the cattle industry. Mycoplasma bovis is resistant to most antibiotics, and there is no good drug to treat it at present. Therefore, vaccination is the most effective prevention and control method. The lack of a small animal evaluation model is one of the important constraints for the development of Mycoplasma bovis vaccines. The small animal challenge model was established to provide a certain research basis for the follow-up vaccine research and preparation, and reduce the scientific research cost of follow-up experiments. In order to establish a small animal model of Mycoplasma bovis infection, two-month-old Japanese big-eared white rabbits were used in this study and divided into 4 groups:1) Mycoplasma bovis strain HB0801 was challenged alone, 2) Mycoplasma bovis strain HB0801 was challenged with dexamethasone, 3) Mycoplasma bovis strain HB0801 was challenged with KLH and thioglycollate medium. 4) Blank control group. The excretion of Mycoplasma bovis was detected by PCR, and the level of antibody in serum was detected. The lungs were taken to make pathological sections after 31 days. The results showed that both the detection rate of M. bovis and the antibody against M. bovis were the highest in the group challenged with M. bovis HB0801 strain after injection of dexamethasone. The detection rate of M. bovis was 42.11%, and 91.67% of the animals tested positive for M. bovis. It was significantly higher than other groups. Except for the blank control group, the other challenge groups showed alveolar wall thickening, macrophage infiltration,and different degrees of fibrinous exudation in the lungs, which were consistent with the pathological characteristics of interstitial pneumonia caused by Mycoplasma bovis. In this study, the infection and evaluation model of Mycoplasma bovis HB0801 strain challenge in Japanese big-eared white rabbits was established, and the best modeling effect was achieved when the immunosuppression was induced by dexamethasone.

Key words: Mycoplasma bovis, animal model, rabbit, dexamethasone

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