Mohammad Panahi, Ali Teimoori, Saber Esmaeili, Hossein Aminianfar, Alireza Milani, Seyed Younes Hosseini, Parisa Esmaeili, Alireza Biglari, Kazem Baesi
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The present study aimed to evaluate the levels of total and neutralizing antibodies produced by PastoCoAd vaccine candidates against the VOC strains at different time points.</p><p><strong>Methods: </strong>Two vaccine candidates were employed against SARS-CoV-2 using adenoviral vectors: prime only (a mixture of rAd5-S and rAd5 RBD-N) and heterologous prime-boost (rAd5-S/SOBERANA vaccine). The immunogenicity of these vaccine candidates was assessed in mouse, rabbit, and hamster models using ELISA assay and virus neutralization antibody test.</p><p><strong>Results: </strong>The immunogenicity results indicated a significant increase in both total and neutralizing antibodies titers in the groups receiving the vaccine candidates at various time points compared to the control group (p < 0.05). 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引用次数: 0
摘要
背景:自 SARS-CoV-2 大流行以来,SARS-CoV-2 的新变异体(如 Alpha、Beta、Gamma、Delta 和 Omicron)不断发生变异,这些变异体被世界公认为 VOC。这些变种会影响疫苗效力、疾病控制和治疗效果。本研究旨在评估 PastoCoAd 候选疫苗在不同时间点针对 VOC 株产生的总抗体和中和抗体水平:使用腺病毒载体对 SARS-CoV-2 接种了两种候选疫苗:纯质子疫苗(rAd5-S 和 rAd5 RBD-N 的混合物)和异源质子强化疫苗(rAd5-S/SOBERANA 疫苗)。使用酶联免疫吸附试验和病毒中和抗体试验在小鼠、家兔和仓鼠模型中评估了这些候选疫苗的免疫原性:免疫原性结果表明,与对照组相比,接种候选疫苗组在不同时间点的总抗体滴度和中和抗体滴度均显著增加(P < 0.05)。结果还表明,PastoCoAd候选疫苗Ad5 S & RBD-N和Ad5 S/SOBERANA能够中和动物模型中的VOC毒株:结论:候选疫苗能够在不同时间点产生中和抗体,从而中和动物模型中的挥发性有机化合物毒株,这可能是由于使用了基于腺病毒载体的平台、Ad5 S & RBD-N 候选疫苗中的 N 蛋白以及 Ad5 S/SOBERANA 候选疫苗中的 SOBERANA Plus 增强剂。
Stability of Neutralizing Antibody of PastoCoAd Vaccine Candidates against a Variant of Concern of SARS-CoV-2 in Animal Models.
Background: Since the beginning of the SARS-CoV-2 pandemic, there have been mutations caused by new SARS-CoV-2 variants, such as Alpha, Beta, Gamma, Delta, and Omicron, recognized as the variants of concern (VOC) worldwide. These variants can affect vaccine efficacy, disease control, and treatment effectiveness. The present study aimed to evaluate the levels of total and neutralizing antibodies produced by PastoCoAd vaccine candidates against the VOC strains at different time points.
Methods: Two vaccine candidates were employed against SARS-CoV-2 using adenoviral vectors: prime only (a mixture of rAd5-S and rAd5 RBD-N) and heterologous prime-boost (rAd5-S/SOBERANA vaccine). The immunogenicity of these vaccine candidates was assessed in mouse, rabbit, and hamster models using ELISA assay and virus neutralization antibody test.
Results: The immunogenicity results indicated a significant increase in both total and neutralizing antibodies titers in the groups receiving the vaccine candidates at various time points compared to the control group (p < 0.05). The results also showed that the PastoCoAd vaccine candidates Ad5 S & RBD-N and Ad5 S/SOBERANA could neutralize the VOC strains in the animal models.
Conclusion: The ability of vaccine candidate to neutralize the VOC strains in animal models by generating neutralizing antibodies at different time points may be attributed to the use of the platform based on the Adenoviral vector, the N proteins in the Ad5 S & RBD-N vaccine candidate, and the SOBERANA Plus booster in the Ad5 S/SOBERANA vaccine candidate.