MPLA-Adjuvanted Liposomes Encapsulating S-Trimer or RBD or S1, but Not S-ECD, Elicit Robust Neutralization Against SARS-CoV-2 and Variants of Concern.
J Med Chem
; 65(4): 3563-3574, 2022 02 24.
Article
in English
| MEDLINE | ID: covidwho-1671476
ABSTRACT
Safe and effective vaccines are the best method to defeat worldwide SARS-CoV-2 and its circulating variants. The SARS-CoV-2 S protein and its subunits are the most attractive targets for the development of protein-based vaccines. In this study, we evaluated three lipophilic adjuvants, monophosphoryl lipid A (MPLA), Toll-like receptor (TLR) 1/2 ligand Pam3CSK4, and α-galactosylceramide (α-GalCer), in liposomal and nonliposomal vaccines. The immunological results showed that the MPLA-adjuvanted liposomal vaccine induced the strongest humoral and cellular immunity. Therefore, we further performed a systematic comparison of S-trimer, S-ECD, S1, and RBD as antigens in MPLA-adjuvanted liposomes and found that, although these four vaccines all induced robust specific antibody responses, only S-trimer, S1, and RBD liposomes, but not S-ECD, elicited potent neutralizing antibody responses. Moreover, RBD, S-trimer, and S1 liposomes effectively neutralized variants (B.1.1.7/alpha, B.1.351/beta, P.1/gamma, B.1.617.2/delta, and B.1.1.529/omicron). These results provide important information for the subunit vaccine design against SARS-CoV-2 and its variants.
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Vaccines, Subunit
/
Spike Glycoprotein, Coronavirus
/
SARS-CoV-2
/
Lipid A
/
Antibodies, Viral
Type of study:
Experimental Studies
/
Systematic review/Meta Analysis
Topics:
Vaccines
/
Variants
Limits:
Animals
Language:
English
Journal:
J Med Chem
Journal subject:
Chemistry
Year:
2022
Document Type:
Article
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