| Autor: |
Júlio Souza dos-Santos, Luan Firmino-Cruz, Alessandra Marcia da Fonseca-Martins, Diogo Oliveira-Maciel, Gustavo Guadagnini Perez, Victor A. Roncaglia-Pereira, Carlos H. Dumard, Francisca H. Guedes-da-Silva, Ana C. Vicente Santos, Monique dos Santos Leandro, Jesuino Rafael Machado Ferreira, Kamila Guimarães-Pinto, Luciana Conde, Danielle A. S. Rodrigues, Marcus Vinicius de Mattos Silva, Renata G. F. Alvim, Tulio M. Lima, Federico F. Marsili, Daniel P. B. Abreu, Orlando C. Ferreira Jr., Ronaldo da Silva Mohana Borges, Amilcar Tanuri, Thiago Moreno L. Souza, Bartira Rossi-Bergmann, André M. Vale, Jerson Lima Silva, Andréa Cheble de Oliveira, Alessandra D’Almeida Filardy, Andre M. O. Gomes, Herbert Leonel de Matos Guedes |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Frontiers in Immunology, Vol 13 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1664-3224 |
| DOI: |
10.3389/fimmu.2022.884760 |
| Popis: |
The SARS-CoV-2 pandemic has had a social and economic impact worldwide, and vaccination is an efficient strategy for diminishing those damages. New adjuvant formulations are required for the high vaccine demands, especially adjuvant formulations that induce a Th1 phenotype. Herein we assess a vaccination strategy using a combination of Alum and polyinosinic:polycytidylic acid [Poly(I:C)] adjuvants plus the SARS-CoV-2 spike protein in a prefusion trimeric conformation by an intradermal (ID) route. We found high levels of IgG anti-spike antibodies in the serum by enzyme linked immunosorbent assay (ELISA) and high neutralizing titers against SARS-CoV-2 in vitro by neutralization assay, after two or three immunizations. By evaluating the production of IgG subtypes, as expected, we found that formulations containing Poly(I:C) induced IgG2a whereas Alum did not. The combination of these two adjuvants induced high levels of both IgG1 and IgG2a. In addition, cellular immune responses of CD4+ and CD8+ T cells producing interferon-gamma were equivalent, demonstrating that the Alum + Poly(I:C) combination supported a Th1 profile. Based on the high neutralizing titers, we evaluated B cells in the germinal centers, which are specific for receptor-binding domain (RBD) and spike, and observed that more positive B cells were induced upon the Alum + Poly(I:C) combination. Moreover, these B cells produced antibodies against both RBD and non-RBD sites. We also studied the impact of this vaccination preparation [spike protein with Alum + Poly(I:C)] in the lungs of mice challenged with inactivated SARS-CoV-2 virus. We found a production of IgG, but not IgA, and a reduction in neutrophil recruitment in the bronchoalveolar lavage fluid (BALF) of mice, suggesting that our immunization scheme reduced lung inflammation. Altogether, our data suggest that Alum and Poly(I:C) together is a possible adjuvant combination for vaccines against SARS-CoV-2 by the intradermal route. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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