畜牧兽医学报 ›› 2023, Vol. 54 ›› Issue (10): 4338-4349.doi: 10.11843/j.issn.0366-6964.2023.10.030

• 预防兽医 • 上一篇    下一篇

大型艾美耳球虫重组蛋白GAPDH对兔的免疫保护效果评价

郑若愚1, 肖洁1, 白鑫1, 陈浩1, 蒲家艳1, 任永军2,3*, 杨光友1*   

  1. 1. 四川农业大学动物医学院, 成都 611130;
    2. 四川省畜牧科学研究院, 成都 610066;
    3. 动物遗传育种四川省重点实验室, 成都 610066
  • 收稿日期:2023-01-30 出版日期:2023-10-23 发布日期:2023-10-26
  • 通讯作者: 杨光友,主要从事动物寄生虫病研究,E-mail:guangyou1963@126.com;任永军,主要从事兔病研究,E-mail:renyj17513@126.com
  • 作者简介:郑若愚(1997-),女,四川成都人,硕士,主要从事动物寄生虫病研究,E-mail:zhengry0831@aliyun.com;肖洁(1995-),女,四川德阳人,博士,主要从事动物寄生虫病研究,E-mail:xiaojjinu@163.com。
  • 基金资助:
    四川省科技计划项目(2022ZHYZ0003);国家重点研发计划(2017YFD0501200)

Evaluation of the Immunoprotective Effect of Recombinant Protein of Eimeria magna 3-Phosphoglyceraldehyde Dehydrogenase on Rabbits

ZHENG Ruoyu1, XIAO Jie1, BAI Xin1, CHEN Hao1, PU Jiayan1, REN Yongjun2,3*, YANG Guangyou1*   

  1. 1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China;
    2. Sichuan Animal Science Academy, Chengdu 610066, China;
    3. Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610066, China
  • Received:2023-01-30 Online:2023-10-23 Published:2023-10-26

摘要: 本研究旨在评价大型艾美耳球虫重组蛋白(rEm-GAPDH)对兔的免疫保护效果,为大型艾美耳球虫重组亚单位疫苗的研制奠定基础。根据转录组数据筛选出Em-GAPDH基因,进行原核表达与蛋白纯化;将50只45日龄无球虫感染幼兔随机分为5组(空白对照组、不免疫攻虫组、Trx-His-S tag攻虫对照组、Quil-A saponin攻虫对照组和rEm-GAPDH免疫组),分别经颈部皮下注射1 mL PBS、1 mL PBS、1 mL PBS含100 μg pET-32a空载蛋白和1 mg Quil-A、1 mL PBS含1 mg Quil-A、1mL 100 μg rEm-GAPDH含1 mg Quil-A,首免14 d后同等剂量加强免疫,二免14 d后每只兔经口感染1×105个大型艾美耳球虫孢子化卵囊,观察各组兔临床症状,每周固定时间采血和称重,感染14 d后宰杀剖检并测定和统计各组兔的卵囊排出量、相对增重、特异性IgG抗体和细胞因子等。结果成功表达了重组蛋白rEm-GAPDH,大小在59 ku左右,且大部分表达在包涵体。免疫保护试验表明:感染后不免疫攻虫组出现症状,而免疫组症状不明显。rEm-GAPDH免疫组的卵囊减少率达57.16%,相对增重率显著大于不免疫攻虫组(P<0.05),ACI值为144.96。特异性IgG抗体水平、细胞因子(IFN-γ、IL-2、IL-4、IL-10、TGF-β)水平均与对照组存在显著差异(P<0.05)。大型艾美耳球虫重组蛋白rEm-GAPDH可以减少增重损失和卵囊排出,能引发宿主体内的细胞免疫和体液免疫应答,具有一定免疫保护作用,可以作为大型艾美耳球虫重组亚单位疫苗的候选抗原。

关键词: 兔, 大型艾美耳球虫, 三磷酸甘油醛脱氢酶, 重组蛋白, 免疫保护

Abstract: The aim of this study was to evaluate the immunoprotective effect of rEm-GAPDH, a recombinant protein of Eimeria magna, on rabbits and to lay the foundation for the development of a recombinant subunit immunization vaccine for rabbits. Screening of Em-GAPDH gene based on transcriptome data for prokaryotic expression and protein purification.Then 50 45-day-old coccidia-free rabbits were randomly divided into 5 groups (Unimmunized and unchallenged group, unimmunized and challenged group, Trx-His-S tag-challenged group, Quil-A saponin-challenged group and rEm-GAPDH immunized group). 1 mL PBS, 1 mL PBS, 1 mL PBS containing 100 μg pET-32a and 1 mg Quil-A, 1 mL PBS containing 1 mg Quil-A, 1 mL 100 μg rEm-GAPDH and 1 mg Quil-A were respectively injected subcutaneously via the neck to the rabbits, and were booster immunized with the same dose 14 d after the first immunization. The clinical manifestations of each group were observed after orally infected 1×105 sporulated oocysts of Eimeria magna to every rabbit, while blood sample and body weight data were collected at regular intervals every week. After 14 d of the challenge, rabbits were dissected, and oocyst output, relative weight gain, cytokines, and specific IgG antibodies were measured and counted for each group. The results showed that the recombinant protein rEm-GAPDH was successfully expressed, with a size of about 59 ku and mostly expressed in the inclusion bodies. The immunoprotection test showed that typical symptoms of rabbit intestinal coccidiosis appeared in the unimmunized and challenged group after infection, while rEm-GAPDH immunized group showed no significant symptoms. rEm-GAPDH immunized group showed 57.16% oocyst reduction, the relative weight gain rate was significantly greater than the unimmunized and challenged group (P<0.05), specific IgG antibody levels, cytokine (IFN-γ, IL-2, IL-4, IL-10, TGF-β) levels were significantly different from those of the control group (P<0.05). The ACI of rEm-GAPDH immunized group was 144.96. The recombinant protein rEm-GAPDH of E.magna can reduce weight loss and oocyst excretion, trigger cellular and humoral immune responses in the host, and have certain immunoprotective effects, thus can be used as a candidate antigen for E.magna recombinant subunit vaccine.

Key words: rabbit, Eimeria magna, 3-phosphoglyceraldehyde dehydrogenase, recombinant protein, immunoprotection

中图分类号: