Zebrafish studies on the vaccine candidate to COVID-19, the Spike protein: Production of antibody and adverse reaction

• Published in: bioRxiv
• Main Authors: Ventura Fernandes, Bianca H, Natália Martins Feitosa, Ana Paula Barbosa, Camila Gasque Bomfim, Anali M B Garnique, Gomes, Francisco I F, Nakajima, Rafael T, Belo, Marco A A, Silas Fernandes Eto, Dayanne, Carla Fernandes, Malafaia, Guilherme, Manrique, Wilson G, Conde, Gabriel, Rosales, Roberta R C, Todeschini, Iris, Rivero, Ilo, Llontop, Edgar, Sgro, German G, Oka, Gabriel Umaji, Bueno, Natalia F, Ferraris, Fausto K, Mariana T Q De Magalhaes, Medeiros, Renata J, Gomes, Juliana M M, Mara De Souza Junqueira, Conceição, Katia, Pontes, Letícia G, Condino-Neto, Antonio, Perez, Andrea C, Barcellos, Leonardo J G, Jose Dias Correa Junior, Dorlass, Erick G, Camara, Niels O S, Durigon, Edison Luiz, Cunha, Fernando Q, Nóbrega, Rafael H, Machado-Santelli, Glaucia M, Farah, Chuck, Veras, Flávio P, Galindo-Villegas, Jorge, Costa-Lotufo, Leticia, Cunha, Thiago M, Chammas, Roger, Guzzo, Cristiane R, Carvalho, Luciani R, Charlie-Silva, Ives
• Format: Paper
• Language: English
• Published: Cold Spring Harbor Cold Spring Harbor Laboratory Press 20.10.2020
• Subjects: ACE2; Angiotensin; Angiotensin-converting enzyme 2; Animal models; Coronaviruses; COVID-19; COVID-19 vaccines; Danio rerio; Humoral immunity; Immune response; Immunosuppressive agents; Inflammation; Peptidyl-dipeptidase A; Protein interaction; Proteins; Safety; Severe acute respiratory syndrome coronavirus 2; Side effects; Spike protein; Structure-function relationships; Toll-like receptors; Vaccines; Viruses
• DOI: 10.1101/2020.10.20.346262

Summary Establishing new experimental animal models to assess the safety and immune response to the antigen used in the development of COVID-19 vaccine is an imperative issue. Based on the advantages of using zebrafish as a model in research, herein we suggest doing this to test the safety of the putative vaccine candidates and to study immune response against the virus. We produced a recombinant N-terminal fraction of the Spike SARS-CoV-2 protein and injected it into adult female zebrafish. The specimens generated humoral immunity and passed the antibodies to the eggs. However, they presented adverse reactions and inflammatory responses similar to severe cases of human COVID-19. The analysis of the structure and function of zebrafish and human Angiotensin-converting enzyme 2, the main human receptor for virus infection, presented remarkable sequence similarities. Moreover, bioinformatic analysis predicted protein-protein interaction of the Spike SARS-CoV-2 fragment and the Toll-like receptor pathway. It might help in the choice of future therapeutic pharmaceutical drugs to be studied. Based on the in vivo and in silico results presented here, we propose the zebrafish as a model for translational research into the safety of the vaccine and the immune response of the vertebrate organism to the SARS-CoV-2 virus. Competing Interest Statement The authors have declared no competing interest.