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Boosting subdominant neutralizing antibody responses with a computationally designed epitope-focused immunogen

机译:通过计算设计的针对抗原决定簇的免疫原增强主要的中和抗体反应

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摘要

Throughout the last several decades, vaccination has been key to prevent and eradicate infectious diseases. However, many pathogens (e.g., respiratory syncytial virus [RSV], influenza, dengue, and others) have resisted vaccine development efforts, largely because of the failure to induce potent antibody responses targeting conserved epitopes. Deep profiling of human B cells often reveals potent neutralizing antibodies that emerge from natural infection, but these specificities are generally subdominant (i.e., are present in low titers). A major challenge for next-generation vaccines is to overcome established immunodominance hierarchies and focus antibody responses on crucial neutralization epitopes. Here, we show that a computationally designed epitope-focused immunogen presenting a single RSV neutralization epitope elicits superior epitope-specific responses compared to the viral fusion protein. In addition, the epitope-focused immunogen efficiently boosts antibodies targeting the palivizumab epitope, resulting in enhanced neutralization. Overall, we show that epitope-focused immunogens can boost subdominant neutralizing antibody responses in vivo and reshape established antibody hierarchies.
机译:在过去的几十年中,疫苗接种一直是预防和根除传染病的关键。然而,许多病原体(例如呼吸道合胞病毒[RSV],流感,登革热和其他)抵抗疫苗开发的努力,主要是因为未能诱导针对保守表位的有效抗体反应。人B细胞的深层分析通常会揭示自然感染产生的有效中和抗体,但这些特异性通常很重要(即以低滴度存在)。下一代疫苗的主要挑战是克服已建立的免疫优势体系,并将抗体反应集中在关键的中和表位上。在这里,我们表明,与病毒融合蛋白相比,通过计算设计的针对抗原决定簇的免疫原呈现单个RSV中和抗原决定簇引发了更高的抗原决定簇特异性反应。此外,针对抗原决定簇的免疫原有效地增强了针对帕利珠单抗抗原决定簇的抗体,从而增强了中和作用。总体而言,我们表明针对抗原决定簇的免疫原可以在体内增强主要的中和抗体反应并重塑已建立的抗体层次。

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