华西口腔医学杂志

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变形链球菌防龋基因疫苗pcDNA3-gtfB免疫途径筛选的实验研究

杨锦波,刘天佳,庄姮   

  1. 610041 四川大学华西口腔医学院
  • 收稿日期:2002-10-25 修回日期:2002-10-25 出版日期:2002-10-20 发布日期:2002-10-20
  • 基金资助:
    本课题为国家自然科学基金资助项目(编号39770797)

A Study on Screening Effective Immunization Route of Anticaries DNA Vaccine pcDNA3-gtfB

Yang Jinbo,Liu Tianjia,Zhuang Heng   

  1. Yang Jinbo,Liu Tianjia,Zhuang Heng West China College ofStomatology, Sichuan University
  • Received:2002-10-25 Revised:2002-10-25 Online:2002-10-20 Published:2002-10-20

摘要:

目的:利用含有葡糖基转移酶抗原基因的重组质粒pcDNA3-gtfB作为基因疫苗,筛选有效的免疫途径。方法:重组质粒pcDNA3-gtfB通过股四头肌注射、鼻腔灌注和颌下腺周注射免疫Wistar大鼠,采用ELISA法测定血清 IgG、唾液IgA的动态变化。结果:经股四头肌注射免疫后产生的血清IgG抗体水平明显高于其它两组血清IgG抗体水平(P<0101),且鼻腔灌注组和颌下腺周注射组间的血清IgG抗体水平无显著性差异(P>0105)。各组唾液S-IgA 抗体水平均存在显著差异(P<0101),腺周注射组产生的唾液S-IgA抗体水平最高(P<0101)。结论:基因疫苗通过腺周注射免疫途径能最有效激发特异性唾液S-IgA抗体的产生,可望成为一种有效的防龋基因疫苗免疫途径,为下一步抗龋动物实验提供了实验基础。

关键词: 龋病, 变形链球菌, 葡糖基转移酶, 基因疫苗

Abstract:

Objective:Glucosyltransferase-B (GTF-B) ofStreptococcus mutanshas been implicated as a principal virulent factor in the development of dental caries. The objective was to use recombined plasmid pcDNA-gtfB expressing multiple antigen of glucosyl- transferase-B as gene vaccine to immunize rats through different route, and to investigate the immunization effects of immunization routes.Methods:Atotal of 18 Wistar ratswere divided into 3 groups, including the quadriceps injection group, the intranasal irri- gation group and the submandibular gland-targeted injection group. The serum IgG and salivary IgAwere assayed by using ELISA afterpcDNA3-gtfB immunization. The serum IgG and salivary IgA in different groups were compared using statistical one-way ANOVA.Results:Compared these 3 groups, the serum IgG in the quadriceps injection groupwasmuch higher than those of other two groups (P<0.01), while the salivary IgA of the submandibular gland-targeted injectionwas much higher than those of other two groups (P<0.01).Conclusion:It is indicated pcDNA3-gtfB is good candidate for anticarious gene vaccine, and sub- mandibular gland-targeted injection is an effective immunization route for stimulating salivary IgA.

Key words: anticaries, Streptococcus mutans, glucosyltransferase, gene vaccine