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Immunization with RBD-P2 and N protects against SARS-CoV-2 in nonhuman primates #MMPMID34049881
Hong SH; Oh H; Park YW; Kwak HW; Oh EY; Park HJ; Kang KW; Kim G; Koo BS; Hwang EH; Baek SH; Park HJ; Lee YS; Bang YJ; Kim JY; Bae SH; Lee SJ; Seo KW; Kim H; Kwon T; Kim JH; Lee S; Kim E; Kim Y; Park JH; Park SI; Goncalves M; Weon BM; Jeong H; Nam KT; Hwang KA; Kim J; Kim H; Lee SM; Hong JJ; Nam JH
Sci Adv 2021[May]; 7 (22): ä PMID34049881show ga
Since the emergence of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), various vaccines are being developed, with most vaccine candidates focusing on the viral spike protein. Here, we developed a previously unknown subunit vaccine comprising the receptor binding domain (RBD) of the spike protein fused with the tetanus toxoid epitope P2 (RBD-P2) and tested its efficacy in rodents and nonhuman primates (NHPs). We also investigated whether the SARS-CoV-2 nucleocapsid protein (N) could increase vaccine efficacy. Immunization with N and RBD-P2 (RBDP2/N) + alum increased T cell responses in mice and neutralizing antibody levels in rats compared with those obtained using RBD-P2 + alum. Furthermore, in NHPs, RBD-P2/N + alum induced slightly faster SARS-CoV-2 clearance than that induced by RBD-P2 + alum, albeit without statistical significance. Our study supports further development of RBD-P2 as a vaccine candidate against SARS-CoV-2. Also, it provides insights regarding the use of N in protein-based vaccines against SARS-CoV-2.