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Selection and evaluation of the immunogenicity of protective antigen mutants as anthrax vaccine candidates

机译:保护性抗原突变体作为炭疽疫苗候选者的免疫原性的选择和评估

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摘要

Protective antigen (PA) is a central component of anthrax toxin and a major antigen in anthrax vaccines. However, the use of native PA as a vaccine is not optimal. If administered to people who have been freshly exposed to anthrax, PA may actually aid in anthrax toxin formation and thus may pose a serious safety concern for postexposure vaccination applications. A non-functional PA mutant may be a much safer alternative. To identify an improved anthrax vaccine antigen, we examined four non-functional mutants of PA, each being impaired in a critical step of the cellular intoxication pathway of PA. These mutants were Rec(-) (unable to bind PA-receptors), SSSR (resistant to activation by furin), Oligo(-) (unable to form oligomers), and DNI (Dominant Negative Inhibitory, unable to form endosomal transmembrane pores). When tested in mice and after three doses of immunization, all four mutants were highly potent in eliciting PA-specific, toxin-neutralizing antibodies, with immunogenicity increasing in the order of PA
机译:保护性抗原(PA)是炭疽毒素的主要成分,也是炭疽疫苗中的主要抗原。然而,使用天然PA作为疫苗不是最佳的。如果对刚接触炭疽的人给药,PA实际上可能有助于炭疽毒素的形成,因此可能对暴露后疫苗的使用引起严重的安全隐患。非功能性PA突变体可能是更安全的选择。为了鉴定改良的炭疽疫苗抗原,我们检查了PA的四个非功能性突变体,每个突变体在PA的细胞中毒途径的关键步骤中均受到损害。这些突变体是Rec(-)(无法结合PA受体),SSSR(对弗林蛋白酶激活具有抵抗力),Oligo(-)(无法形成寡聚体)和DNI(显性负抑制作用,无法形成内体跨膜孔)。 。当在小鼠中进行测试并且经过三剂免疫接种后,所有四个突变体在诱导PA特异性,毒素中和抗体方面均非常有效,且免疫原性按PA

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