Improved Durability to SARS-CoV-2 Vaccine Immunity following Coimmunization with Molecular Adjuvant Adenosine Deaminase-1.

Improved Durability to SARS-CoV-2 Vaccine Immunity following Coimmunization with Molecular Adjuvant Adenosine Deaminase-1.
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与分子佐剂腺苷脱氨酶-1共同免疫可提高对SARS-CoV-2疫苗免疫的持久性。

DOI:
10.4049/jimmunol.2200056
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发表时间:
2022-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
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其他
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虽然SARS-CoV-2疫苗表现出很强的免疫原性和保护性,但人们对这些反应的持续时间和广度仍然感到担忧。在这项研究中,我们证明了与SARS-CoV-2刺突DNA抗原(PS)共传递质粒编码的腺苷脱氨酶-1(PADA),增强了体内的免疫记忆和耐久性。与仅PS免疫的小鼠相比,联合免疫的小鼠表现出更高亲和力和中和能力的刺激性特异性免疫球蛋白。重要的是,PADA显著延长了体内这些增强反应的寿命。这与浆母细胞、受体结合域(RBD)特异性记忆B细胞和SARS-CoV-2特异性T滤泡辅助细胞的频率持续增加相一致。刺激性T细胞多功能性增加也被观察到。值得注意的是,在SARS-CoV-2感染模型中,与非佐剂免疫的动物相比,与PADA联合免疫的动物的病毒载量显著减少。这些数据表明,PADA增强了免疫记忆和耐久性,并支持进一步的翻译研究。
While SARS-CoV-2 vaccines have demonstrated strong immunogenicity and protection, concerns about the duration and breadth of these responses remain. In this study, we show that co-delivery of plasmid-encoded adenosine deaminase-1 (pADA) with SARS-CoV-2 spike DNA antigens (pS), enhances immune memory and durability in vivo. Co-immunized mice displayed increased spike-specific IgG of higher affinity and neutralizing capacity as compared to pS-only immunized animals. Importantly, pADA significantly improved the longevity of these enhanced responses in vivo. This coincided with durable increases in frequencies of plasmablasts, receptor binding domain (RBD)-specific memory B cells, and SARS-CoV-2 specific T follicular helper cells. Increased spike-specific T cell polyfunctionality was also observed. Notably, animals co-immunized with pADA had significantly reduced viral loads compared to their non-adjuvanted counterparts in a SARS-CoV-2 infection model. These data suggest that pADA enhances immune memory and durability and supports further translational studies.
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