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Immune responses and protective efficacy induced in mice by Mycobacterium tuberculosis MPT64-ESAT6 fusion protein
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 9
- DOI:
- 10.3321/j.issn:1000-2790.2006.09.001
- Key Word:
- 结核分枝杆菌;疫苗;MPT64;ESAT6;融合表达
Abstract： 目的:测定MPT64与ESAT6融合蛋白在小鼠体内诱导的免疫应答及保护力. 方法:将MPT64与ESAT6的融合蛋白皮下免疫小鼠3次,每次间隔2 wk,ELISA测定免疫小鼠血清特异性抗体的滴度. 最后一次免疫完成后4 wk,分离部分免疫小鼠脾淋巴细胞,MTT法检测淋巴细胞刺激指数,ELISA检测悬液中IFN-γ水平. 另一部分免疫的BALB/c小鼠经尾静脉感染MTB毒株H37Rv,4 wk后计数脾脏细菌负荷数. 结果:MPT64-ESAT6融合蛋白免疫小鼠血清特异性抗体滴度1∶ 1500,免疫小鼠后淋巴细胞刺激增殖指数为2.23,而生理盐水免疫组只有0.88;脾淋巴细胞悬液中诱发的IFN-γ为(4.28±0.27)μg/L,显著高于生理盐水免疫组[(0.48±0.17) μg/L,P<0.05],但不及BCG免疫组[(5.18±0.31)μg/L]. 与生理盐水免疫组(细菌负荷6.45±0.17)相比较,融合蛋白免疫的小鼠,对攻击感染后抗MTB在脾脏中增殖有显著作用,细菌负荷为5.04±0.11,但与BCG免疫组相比脾脏细菌负荷减少甚微(细菌负荷4.38±0.22). 结论:MPT64与ESAT6融合蛋白可作为新型结核疫苗的候选组分.
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