An Algae-Made RBD from SARS-CoV-2 Is Immunogenic in Mice

Autor: Dania O. Govea-Alonso, Ashwini Malla, Omayra C. Bolaños-Martínez, Sornkanok Vimolmangkang, Sergio Rosales-Mendoza
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Pharmaceuticals, Vol 15, Iss 10, p 1298 (2022)
Druh dokumentu: article
ISSN: 1424-8247
45702772
DOI: 10.3390/ph15101298
Popis: Despite the current advances in global vaccination against SARS-CoV-2, boosting is still required to sustain immunity in the population, and the induction of sterilizing immunity remains as a pending goal. Low-cost oral immunogens could be used as the basis for the design of affordable and easy-to-administer booster vaccines. Algae stand as promising platforms to produce immunogens at low cost, and it is possible to use them as oral delivery carriers since they are edible (not requiring complex purification and formulation processes). Herein, a Chlamydomonas-made SARS-CoV-2 RBD was evaluated as an oral immunogen in mice to explore the feasibility of developing an oral algae-based vaccine. The test immunogen was stable in freeze-dried algae biomass and able to induce, by the oral route, systemic and mucosal humoral responses against the spike protein at a similar magnitude to those induced by injected antigen plus alum adjuvant. IgG subclass analysis revealed a Th2-bias response which lasted over 4 months after the last immunization. The induced antibodies showed a similar reactivity against either Delta or Omicron variants. This study represents a step forward in the development of oral vaccines that could accelerate massive immunization.
Databáze: Directory of Open Access Journals
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