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SARS-CoV-2 sublingual vaccine with RBD antigen and poly(I:C) adjuvant: Preclinical study in cynomolgus macaques.
- Source :
- Biology Methods & Protocols; 2023, Vol. 8 Issue 1, p1-5, 5p
- Publication Year :
- 2023
-
Abstract
- Mucosal vaccine for sublingual route was prepared with recombinant SARS-CoV-2 spike protein receptor binding domain (RBD) antigen and poly(I:C) adjuvant components. The efficacy of this sublingual vaccine was examined using Cynomolgus macaques. Nine of the macaque monkeys were divided into three groups of three animals: control [just 400 µg poly(I:C) per head], low dose [30 µg RBD and 400 µg poly(I:C) per head], and high dose [150 µg RBD and 400 µg poly(I:C) per head], respectively. N-acetylcysteine (NAC), a mild reducing agent losing mucin barrier, was used to enhance vaccine delivery to mucosal immune cells. RBD-specific IgA antibody secreted in pituita was detected in two of three monkeys of the high dose group and one of three animals of the low dose group. RBD-specific IgG and/or IgA antibodies in plasma were also detected in these monkeys. These indicated that the sublingual vaccine stimulated mucosal immune response to produce antigen-specific secretory IgA antibodies in pituita and/or saliva. This sublingual vaccine also affected systemic immune response to produce IgG (IgA) in plasma. Little RBD-specific IgE was detected in plasma, suggesting no allergic antigenicity of this sublingual vaccine. Thus, SARS-CoV-2 sublingual vaccine consisting of poly(I:C) adjuvant showed reasonable efficacy in a non-human primate model. [ABSTRACT FROM AUTHOR]
- Subjects :
- BIOLOGICAL research
SARS-CoV-2
IMMUNOGLOBULINS
IMMUNE response
VACCINES
Subjects
Details
- Language :
- English
- ISSN :
- 23968923
- Volume :
- 8
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Biology Methods & Protocols
- Publication Type :
- Academic Journal
- Accession number :
- 174980411
- Full Text :
- https://doi.org/10.1093/biomethods/bpad017