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季节性和大流行性H1N1流感血凝素DNA疫苗电穿孔免疫小鼠及攻毒保护实验

, PP. 143-149

Keywords: 季节性流感,大流行性流感,血凝素,DNA疫苗,电穿孔,H1N1流感病毒

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Abstract:

在流感病毒疫苗中,DNA疫苗有望成为常规疫苗的替代品.研究构建了两个分别编码A/NewCaledonia/20/99(H1N1)和A/California/04/2009(H1N1)流感病毒株血凝素抗原的DNA疫苗pV1A5和pVEH1,目的抗原经验证能够正确表达后,利用小鼠模型通过电穿孔方法肌肉注射免疫进行疫苗免疫效力评价.采用血凝抑制实验和酶联免疫吸附实验对免疫小鼠的血清进行血凝素特异性抗体检测,对血凝素特异性的T淋巴细胞经IFN-γ酶联免疫斑点实验进行检测.然后选择小鼠适应株A/NewCaledonia/20/99(H1N1)100个半数致死剂量对候选疫苗免疫的小鼠攻毒并监测生存率和体重变化率,以此评价疫苗保护效力.两疫苗组免疫小鼠T淋巴细胞和体液免疫水平显著高于pVAX1空载体对照组(P<0.05).此外,pV1A5组能够100%保护免疫小鼠抵抗100致死剂量同源病毒小鼠适应株的攻毒,而同种病毒下pVEH1组只有40%的保护率.结果表明,本实验构建的季节性流感DNA疫苗能够对同源病毒攻毒提供完全保护,而大流行流感株DNA疫苗只能部分抵抗季节性流感病毒.

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