畜牧兽医学报 ›› 2020, Vol. 51 ›› Issue (9): 2257-2264.doi: 10.11843/j.issn.0366-6964.2020.09.023

• 预防兽医 • 上一篇    下一篇

鸡传染性支气管炎病毒S1蛋白抗原表位多肽的预测、鉴定及免疫效果的初步研究

范文胜, 朱丹, 张愉, 廖健淇, 王露, 雍璐, 韦平*, 磨美兰*   

  1. 广西大学动物科学技术学院, 南宁 530005
  • 收稿日期:2020-03-02 出版日期:2020-09-25 发布日期:2020-09-25
  • 通讯作者: 韦平,主要从事禽病与病原分子生物学研究,E-mail:pingwei8@126.com;磨美兰,主要从事禽病与病原分子生物学研究,E-mail:momeilan@163.com
  • 作者简介:范文胜(1983-),男,广东清远人,博士生,主要从事禽病与病原分子生物学研究,E-mail:2003424318@163.com;朱丹(1996-),女,安徽铜陵人,硕士生,主要从事禽病与病原分子生物学研究,E-mail:18956632047@163.com。
  • 基金资助:
    广西科技重大专项(桂科AA17204057);国家自然科学基金项目(31860715);广西自然科学基金项目(2018GXNSFAA281009;2019GXNSFAA245009);广西研究生教育创新计划项目(YCBZ2018003)

Prediction, Identification and Preliminary Study on Immune Efficacy of S1 Protein Epitope-polypeptides of Avian Infectious Bronchitis Virus

FAN Wensheng, ZHU Dan, ZHANG Yu, LIAO Jianqi, WANG Lu, YONG Lu, WEI Ping*, MO Meilan*   

  1. College of Animal Science and Technology, Guangxi University, Nanning 530005, China
  • Received:2020-03-02 Online:2020-09-25 Published:2020-09-25

摘要: 旨在对鸡传染性支气管炎病毒(IBV)H120株S1蛋白的B细胞及T细胞可能的表位进行预测并合成相应的多肽,然后免疫小鼠,并分析其免疫效果,以验证候选表位多肽的免疫原性。利用表位预测软件筛选并化学合成针对IBV H120株S1蛋白的5条表位多肽,然后免疫小鼠,通过间接ELISA、中和试验和流式细胞技术检测各表位多肽诱导的特异性抗体、中和抗体和外周血T细胞亚群。ELISA检测结果显示,5条表位多肽均具有良好的反应原性,免疫小鼠的血清效价高低顺序依次为Pep76-106 > Pep240-257 > Pep511-537 > Pep403-421 > Pep135-172;中和试验结果表明,5条多肽免疫小鼠的血清中和滴度均高于空白对照组,其高低顺序依次为Pep240-257=Pep403-421=Pep511-537>Pep76-106=Pep135-172;流式检测结果表明,5条多肽免疫小鼠在CD3+、CD4+CD8-、CD8+CD4- T淋巴细胞水平上均极显著高于空白对照组(P<0.01),CD3+T及CD4+CD8-T淋巴细胞数大小顺序依次为Pep403-421 > Pep240-257 > Pep76-106 > Pep511-537 > Pep135-172,CD8+CD4-T淋巴细胞数大小顺序依次为Pep403-421 > Pep76-106 > Pep511-537 > Pep240-257 > Pep135-172。合成的5条表位多肽中,Pep240-257、Pep76-106和Pep403-421可以诱导体液免疫,Pep403-421可以诱导细胞免疫,其中,Pep403-421可以同时诱导细胞免疫及体液免疫。本研究结果为深入了解S1蛋白的免疫学特性以及研发诊断试剂和有效表位疫苗奠定了基础。

关键词: 鸡传染性支气管炎病毒, H120株, S1蛋白, 表位多肽, 特异性抗体, 中和抗体, T淋巴细胞亚群

Abstract: For the sake of verifying the immunogenicity of candidate epitope-polypeptide, the B and T cell epitopes of S1 protein of avian infectious bronchitis virus (IBV) H120 strain were predicted and the corresponding epitope-polypeptides were synthesized, and then were used to immunize mice, the immune effect was analyzed. Five epitope-polypeptides against S1 protein of IBV H120 strain were selected by epitope prediction software and acquired by chemical synthesis, then were immunized to mice. The specific antibodies, neutralizing antibodies and T lymphocyte subsets induced by each epitope-polypeptides were analyzed by indirect ELISA, neutralization test and flow cytometry. The ELISA results showed that the five epitope-polypeptides had good reactivity. The antibody titers of antisera induced by the five epitope-polypeptides sorted from high to low as follows: Pep76-106, Pep240-257, Pep511-537, Pep403-421, Pep135-172. The neutralization test results showed that the neutralization titers of antisera induced by the five epitope-polypeptides groups in mice were higher than that of the blank control group, and the order of neutralization titers was Pep240-257 = Pep403-421 = Pep511-537 > Pep76-106 = Pep135-172. The flow cytometry results showed that the percentages of CD3+, CD4+CD8- and CD8+CD4- T lymphocytes in all the five epitope-polypeptides groups were significantly higher (P<0.01) than those in the blank control group. The number of the CD3+ and CD4+CD8- T lymphocytes sorted from large to small as follows: Pep403-421, Pep240-257, Pep76-106, Pep511-537 and Pep135-172. The number of the CD8+CD4- T lymphocytes sorted from large to small as follows: Pep403-421, Pep76-106, Pep511-537, Pep240-257 and Pep135-172. In conclusion, Pep240-257, Pep76-106 and Pep403-421 could induce humoral immunity among the five epitope-polypeptides, while Pep403-421 could induce cellular immunity. Thus, peptide of Pep403-421 could induce cellular immunity and humoral immunity. This study laid a foundation for further understanding the immunological characteristics of the S1 protein and the development of diagnostic reagents and effective epitope vaccines.

Key words: avian infectious bronchitis virus, H120 strain, S1 protein, epitope-polypeptide, specificity antibody, neutralizing antibody, T lymphocyte subsets

中图分类号: