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Construction of subunit and DNA vaccine of heat shock protein 65 of Mycobacterium tuberculosis and their immunological properties
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 9
- DOI:
- 10.3321/j.issn:1000-2790.2008.09.001
- Key Word:
- 结核分枝杆菌;热休克蛋白质类;亚单位疫苗;基因疫苗
Abstract： 目的:构建HSP 65蛋白的亚单位疫苗和基因疫苗,并与BCG相比较,评价这两种疫苗在小鼠体内的免疫学特性.方法:从结核分枝杆菌H37Rv基因组中扩增出hsp 65基因,连接进入pMD18-T载体中,测序后,利用不同酶切位点将完整的hsp 65基因分别克隆到pProEX HTb原核表达载体和pcDNA3.1(-)真核表达载体,前者在大肠杆菌中诱导表达,经SDS-PAGE和Western Blot分析后,用Ni-NTA亲和层析柱进行纯化;后者通过阳离子聚合物瞬转P815细胞,用间接免疫荧光检测细胞内HSP 65蛋白的表达.用上述原核表达蛋白和真核质粒(分别为亚单位疫苗和基因疫苗)免疫BALB/c小鼠,ELISA测定特异性抗体的滴度,MTT测定脾淋巴细胞特异性增殖指数.结果:获得的结核分枝杆菌hsp 65基因序列与GenBank公布的完全一致;Western Blot结果显示,在M<,r>约65000处有与鼠抗HSP 65 mAb和临床结核患者血清的特异性结合带;免疫荧光结果显示转染重组质粒的P815细胞的表达蛋白与HSP 65 mAb有特异性结合.两种疫苗免疫小鼠体内产生特异性抗体,经蛋白刺激后可引起脾淋巴细胞特异性增殖.结论:所构建的两种疫苗能引起免疫动物的特异性体液和细胞免疫反应,应进一步研究其抵抗结核分支杆菌感染的保护力机制,以用于结核病的防治研究.
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