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沙眼衣原体主要外膜蛋白多表位基因的免疫原性研究

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摘要 目的构建包含沙眼衣原体(Chlamydia trachomatis,Ct)主要外膜蛋白(major outer membrane protein,MOMP)多表位基因的真核表达质粒pcDNA3.1-CtMOMP168,检测其诱导BALB/c小鼠产生CtMOMP特异性体液和细胞免疫反应的水平。方法构建包含CtMOMP多表位基因的重组质粒pcDNA3.1,CtMOMP168并以肌肉注射方式免疫BALB/c小鼠,同时设置pcDNA3.1组和PBS组对照(每组12只,每只100μg/次)。采用酶联免疫吸附试验(ELISA)、乳酸脱氢酶释放法及细胞内细胞因子染色-流式细胞术(ICS—FACS)分别检测免疫小鼠血清中CtMOMP特异性抗体的滴度及其抗体亚型、脾脏中细胞毒性T淋巴细胞(CTL)的杀伤活性及特异性分泌细胞因子,如γ-干扰素-(IFN-1)、白细胞介素-4(IL-4)、白细胞介素-10(IL-10)等的CD3^+T细胞的水平。结果同pcDNA3.1(A490=0.180±0.025)和PBS免疫(A490=0.110±0.015)相比,pcDNA3.1-CtMOMP168免疫可刺激小鼠产生高效价0特异性IgG抗体(A490=0.973±0.136;血清滴度1:1000),且抗体亚型以IgG2a为主,差异有统计学意义(F=106.884,P〈0.05);pcDNA3.1-CtMOMP168免疫组小鼠脾细胞中CTL杀伤活性(41.71%±8.34%)高于pcDNA3.1组(18.40%±3.45%)和PBS组(14.50%±2.42%),差异有统计学意义(F=22.315,P〈0.05;效靶比为50:1);pcDNA3.1-CtMOMPl68免疫组小鼠的脾细胞中CtMOMP特异性CD3^+IFN-γ^+T细胞的水平(1.15%±0.16%)高于pcDNA3.1组(0.12%±0.08%)和PBS组(0.09%±0.03%),差异有统计学意义(F=99.638,P〈0.05),而pcDNA3.1-CtMOMP168组IL4^+CD3^+T细胞(0.13%±0.08%)和IL-10^+CD3^+T细胞(0.14%±0.08%)的水平与pcDNA3.1(0.07%±0.05%,0.13%±0.06%)和PBS(0.08%±0.04%,0.07%±0.04%)组比较差异无统计学意义(F值分别为0.886、1.112,P值均〉0.05)。结论pcDNA3.1-CtMOMP168重组质粒能诱导BALB/c小鼠产生CtMOMP特异性的体液免疫和细胞免疫应答。
出处 《中华预防医学杂志》 CAS CSCD 北大核心 2009年第3期232-236,共5页 Chinese Journal of Preventive Medicine
基金 国家自然科学基金(30271191) 浙江省自然科学基金(Y205659) 温州市科技局(Y20060084)
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