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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. 2022-02; 
Jian Wang, Xu-Guang Yin, Yu Wen, Jie Lu, Ru-Yan Zhang, Shi-Hao Zhou, Chun-Miao Liao, Hua-Wei Wei, Jun Guo
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Proteins, Expression, Isolation and Analysis … might effectively neutralize variant B.1.1.7 (alpha), but that neutralizing titers against … covering the full-length spike protein in duplicate (GenScript, RP30020). The cells were first cultured … Get A Quote


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 PamCSK, and α-galactosylceramide (-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... More