Abstract
Highly divergent SARS-CoV-2 variants have continuously emerged and spread around the world, and updated vaccines and innovative vaccination strategies are urgently needed to address the global SARS-COV2 pandemic. Here, we established a series of Ad5-vectored SARS-CoV-2 variant vaccines encoding multiple spike proteins derived from the Alpha, Beta, Gamma, Epsilon, Kappa, Delta and Omicron lineages and analyzed the antibody immune responses induced by single-dose and prime-boost vaccination strategies against emerging SARS-CoV-2 variants of concern (VOCs). Single-dose vaccination with SARS-CoV-2 variant vaccines tended to elicit the optimal self-matched neutralizing effects, and Ad5-B.1.351 produced more broad-spectrum cross-neutralizing antibodies against diverse variants. In contrast, prime-boost vaccination further strengthened and broadened the neutralizing antibody responses against highly divergent SARS-CoV-2 variants. The heterologous administration of Ad5-B.1.617.2 and Ad5-B.1.429 to Ad5-WT-primed mice resulted in superior antibody responses against most VOCs. In particular, the Omicron spike could only stimulate self-matched neutralizing antibodies with infrequent cross-reactivities to other variants used in single-dose vaccination strategies; moreover, with prime-boost regimens, this vaccine elicited an optimal specific neutralizing antibody response to Omicron, and prompted cross-antibody responses against other VOCs that were very similar to those obtained with Ad5-WT booster. Overall, this study delineated the unique characteristics of antibody responses to the SARS-CoV-2 VOC spikes with the single-dose or prime-boost vaccination strategies and provided insight into the vaccine development of next SARS-CoV-2 VOCs.
【초록키워드】 neutralizing antibody, SARS-CoV-2, Vaccine, Vaccine development, immune response, vaccination, pandemic, Neutralizing antibodies, spike, antibody, VoC, B.1.351, Antibody Response, SARS-CoV-2 variant, Delta, B.1.617.2, omicron, variants, Spike protein, cross-reactivity, Spread, Antibody responses, Characteristics, SARS-CoV-2 variants, cross-neutralizing antibody, mice, Epsilon, immune responses, VOCs, Lineage, Gamma, Alpha, B.1.429, Beta, Neutralizing, Neutralizing antibody response, Heterologous, booster, administration, Spike proteins, Vaccination strategy, Single-dose, other variants, regimens, neutralizing antibody responses, Effects, produced, analyzed, provided, unique, elicit, the vaccine, elicited, stimulate, responses against, other variant, the SARS-CoV-2, 【제목키워드】 SARS-CoV-2, VoC, Antibody Response, Spike protein, Comparative,