Evaluation of an RBD-nucleocapsid fusion protein as a booster candidate for COVID-19 vaccine

Despite successful vaccines and updates, constant mutations of SARS-CoV-2 makes necessary the search for new vaccines. We generated a chimeric protein that comprises the receptor-binding domain from spike and the nucleocapsid antigens (SpiN) from SARS-CoV-2. Once SpiN elicits a protective immune res...

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Veröffentlicht in:iScience 2024-07, Vol.27 (7), p.110177, Article 110177
Hauptverfasser: Valiate, Bruno Vinicius Santos, Castro, Julia Teixeira de, Marçal, Tomás Gazzinelli, Andrade, Luis Adan Flores, Oliveira, Livia Isabela de, Maia, Gabriela Barbi Freire, Faustino, Lídia Paula, Hojo-Souza, Natalia S., Reis, Marconi Augusto Aguiar Dos, Bagno, Flávia Fonseca, Salazar, Natalia, Teixeira, Santuza R., Almeida, Gregório Guilherme, Gazzinelli, Ricardo Tostes
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Sprache:eng
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Zusammenfassung:Despite successful vaccines and updates, constant mutations of SARS-CoV-2 makes necessary the search for new vaccines. We generated a chimeric protein that comprises the receptor-binding domain from spike and the nucleocapsid antigens (SpiN) from SARS-CoV-2. Once SpiN elicits a protective immune response in rodents, here we show that convalescent and previously vaccinated individuals respond to SpiN. CD4+ and CD8+ T cells from these individuals produced greater amounts of IFN−γ when stimulated with SpiN, compared to SARS-CoV-2 antigens. Also, B cells from these individuals were able to secrete antibodies that recognize SpiN. When administered as a boost dose in mice previously immunized with CoronaVac, ChAdOx1-S or BNT162b2, SpiN was able to induce a greater or equivalent immune response to homologous prime/boost. Our data reveal the ability of SpiN to induce cellular and humoral responses in vaccinated human donors, rendering it a promising candidate. [Display omitted] •SpiN induced IFN-Υ in CD4 and CD8 T cells of convalescent and vaccinated individuals•IgG from convalescent and vaccinated individuals recognized SpiN•Mice respond similarly or better when boosted with SpiN than with commercial vaccines Health sciences; Public health; Immunology; Virology
ISSN:2589-0042
2589-0042
DOI:10.1016/j.isci.2024.110177