國家衛生研究院 NHRI:Item 3990099045/14269

NHRI > National Institute of Infectious Diseases and Vaccinology > Shih-Jen Liu > Periodical Articles > Item 3990099045/14269

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/14269

Title:	Low-dose SARS-CoV-2 S-trimer with an emulsion adjuvant induced th1-biased protective immunity
Authors:	Liao, HC;Wu, WL;Chiang, CY;Huang, MS;Shen, KY;Huang, YL;Wu, SC;Liao, CL;Chen, HW;Liu, SJ
Contributors:	National Institute of Infectious Diseases and Vaccinology
Abstract:	During the sustained COVID-19 pandemic, global mass vaccination to achieve herd immunity can prevent further viral spread and mutation. A protein subunit vaccine that is safe, effective, stable, has few storage restrictions, and involves a liable manufacturing process would be advantageous to distribute around the world. Here, we designed and produced a recombinant spike (S)-Trimer that is maintained in a prefusion state and exhibits a high ACE2 binding affinity. Rodents received different doses of S-Trimer (0.5, 5, or 20 mu g) antigen formulated with aluminum hydroxide (Alum) or an emulsion-type adjuvant (SWE), or no adjuvant. After two vaccinations, the antibody response, T-cell responses, and number of follicular helper T-cells (Tfh) or germinal center (GC) B cells were assessed in mice; the protective efficacy was evaluated on a Syrian hamster infection model. The mouse studies demonstrated that adjuvating the S-Trimer with SWE induced a potent humoral immune response and Th1-biased cellular immune responses (in low dose) that were superior to those induced by Alum. In the Syrian hamster studies, when S-Trimer was adjuvanted with SWE, higher levels of neutralizing antibodies were induced against live SARS-CoV-2 from the original lineage and against the emergence of variants (Beta or Delta) with a slightly decreased potency. In addition, the SWE adjuvant demonstrated a dose-sparing effect; thus, a lower dose of S-Trimer as an antigen (0.5 mu g) can induce comparable antisera and provide complete protection from viral infection. These data support the utility of SWE as an adjuvant to enhance the immunogenicity of the S-Trimer vaccine, which is feasible for further clinical testing.
Date:	2022-04-28
Relation:	International Journal of Molecular Sciences. 2022 Apr 28;23(9):Article number 4902.
Link to:	http://dx.doi.org/10.3390/ijms23094902
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1422-0067&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000794491400001
Cited Times(Scopus):	https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85129073008
Appears in Collections:	[Shih-Jen Liu] Periodical Articles [Hsin-Wei Chen] Periodical Articles [Ching-Len Liao] Periodical Articles

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