SARS-CoV-2 spike glycoprotein vaccine candidate NVX-CoV2373 immunogenicity in baboons and protection in mice.

SARS-CoV-2 spike glycoprotein vaccine candidate NVX-CoV2373 immunogenicity in baboons and protection in mice.
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SARS-CoV-2刺突糖蛋白疫苗候选物NVX-CoV 2373在狒狒中的免疫原性和在小鼠中的保护性。

DOI:
10.1038/s41467-020-20653-8
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发表时间:
2021-01-14
影响因子:
16.6
通讯作者:
Smith G
Smith G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tian JH;Patel N;Haupt R;Zhou H;Weston S;Hammond H;Logue J;Portnoff AD;Norton J;Guebre-Xabier M;Zhou B;Jacobson K;Maciejewski S;Khatoon R;Wisniewska M;Moffitt W;Kluepfel-Stahl S;Ekechukwu B;Papin J;Boddapati S;Jason Wong C;Piedra PA;Frieman MB;Massare MJ;Fries L;Bengtsson KL;Stertman L;Ellingsworth L;Glenn G;Smith G

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COVID-19 大流行继续在世界各地蔓延,迫切需要一种安全且具有保护性的疫苗来实现牛群保护并控制 SARS-CoV-2 的传播。在此,我们报告了利用在预融合构象中稳定的全长刺突 (S) 蛋白开发了 SARS-CoV-2 亚单位疫苗 (NVX-CoV2373)。 NVX-CoV2373 S 形成 27.2 nm 纳米颗粒,具有热稳定性,并以高亲和力与人血管紧张素转换酶 2 (hACE2) 受体结合。在小鼠中,低剂量 NVX-CoV2373 与基于皂苷的 Matrix-M 佐剂引发高滴度抗 S IgG,该抗体可阻断 hACE2 受体结合、中和病毒并防止 SARS-CoV-2 攻击,且没有证据表明疫苗相关的呼吸道疾病增强。 NVX-CoV2373 还会在脾脏中引发多功能 CD4+ 和 CD8+ T 细胞、CD4+ 滤泡辅助 T 细胞 (Tfh) 和抗原特异性生发中心 (GC) B 细胞。在狒狒中,低剂量水平的 NVX-CoV2373 与 Matrix-M 也具有高度免疫原性,并引发高滴度抗 S 抗体和功能性抗体,阻止 S 蛋白与 hACE2 结合并中和病毒感染和抗原特异性 T 细胞。这些结果支持正在进行的 NVX-CoV2373 与 Matrix-M 的安全性和免疫原性的 1/2 期临床评估 (NCT04368988)。在这里,作者描述了一种 SARS-CoV-2 亚单位候选疫苗,其包含稳定在其预融合构象的全长刺突蛋白,并在狒狒中显示出免疫原性,并在使用 Matrix-M 佐剂疫苗的小鼠中显示出免疫原性。
The COVID-19 pandemic continues to spread throughout the world with an urgent need for a safe and protective vaccine to effectuate herd protection and control the spread of SARS-CoV-2. Here, we report the development of a SARS-CoV-2 subunit vaccine (NVX-CoV2373) from the full-length spike (S) protein that is stable in the prefusion conformation. NVX-CoV2373 S form 27.2-nm nanoparticles that are thermostable and bind with high affinity to the human angiotensin-converting enzyme 2 (hACE2) receptor. In mice, low-dose NVX-CoV2373 with saponin-based Matrix-M adjuvant elicit high titer anti-S IgG that blocks hACE2 receptor binding, neutralize virus, and protects against SARS-CoV-2 challenge with no evidence of vaccine-associated enhanced respiratory disease. NVX-CoV2373 also elicits multifunctional CD4+ and CD8+ T cells, CD4+ follicular helper T cells (Tfh), and antigen-specific germinal center (GC) B cells in the spleen. In baboons, low-dose levels of NVX-CoV2373 with Matrix-M was also highly immunogenic and elicited high titer anti-S antibodies and functional antibodies that block S-protein binding to hACE2 and neutralize virus infection and antigen-specific T cells. These results support the ongoing phase 1/2 clinical evaluation of the safety and immunogenicity of NVX-CoV2373 with Matrix-M (NCT04368988). Here, the authors characterize a SARS-CoV-2 subunit vaccine candidate that contains full-length spike protein stabilized in its prefusion conformation, and show immunogenicity in baboons and protection in mice with Matrix-M adjuvanted vaccine.
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