A triple-RBD-based mucosal vaccine provides broad protection against SARS-CoV-2 variants of concern
0301 basic medicine
COVID-19 Vaccines
SARS-CoV-2
COVID-19
Antibodies, Viral
Antibodies, Neutralizing
Article
3. Good health
Mice
03 medical and health sciences
Spike Glycoprotein, Coronavirus
Animals
Humans
Immunity, Mucosal
Administration, Intranasal
DOI:
10.1038/s41423-022-00929-3
Publication Date:
2022-10-11T10:03:58Z
AUTHORS (15)
ABSTRACT
The rapid mutation and spread of SARS-CoV-2 variants urge the development of effective mucosal vaccines to provide broad-spectrum protection against the initial infection and thereby curb the transmission potential. Here, we designed a chimeric triple-RBD immunogen, 3Ro-NC, harboring one Delta RBD and two Omicron RBDs within a novel protein scaffold. 3Ro-NC elicits potent and broad RBD-specific neutralizing immunity against SARS-CoV-2 variants of concern. Notably, intranasal immunization with 3Ro-NC plus the mucosal adjuvant KFD (3Ro-NC + KFDi.n) elicits coordinated mucosal IgA and higher neutralizing antibody specificity (closer antigenic distance) against the Omicron variant. In Omicron-challenged human ACE2 transgenic mice, 3Ro-NC + KFDi.n immunization significantly reduces the tissue pathology in the lung and lowers the viral RNA copy numbers in both the lung (85.7-fold) and the nasal turbinate (13.6-fold). Nasal virologic control is highly correlated with RBD-specific secretory IgA antibodies. Our data show that 3Ro-NC plus KFD is a promising mucosal vaccine candidate for protection against SARS-CoV-2 Omicron infection, pathology and transmission potential.
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CITATIONS (27)
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