Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Jun;594(7862):253-258.
doi: 10.1038/s41586-021-03530-2. Epub 2021 Apr 19.

Adjuvanting a subunit COVID-19 vaccine to induce protective immunity

Affiliations

Adjuvanting a subunit COVID-19 vaccine to induce protective immunity

Prabhu S Arunachalam et al. Nature. 2021 Jun.

Abstract

The development of a portfolio of COVID-19 vaccines to vaccinate the global population remains an urgent public health imperative1. Here we demonstrate the capacity of a subunit vaccine, comprising the SARS-CoV-2 spike protein receptor-binding domain displayed on an I53-50 protein nanoparticle scaffold (hereafter designated RBD-NP), to stimulate robust and durable neutralizing-antibody responses and protection against SARS-CoV-2 in rhesus macaques. We evaluated five adjuvants including Essai O/W 1849101, a squalene-in-water emulsion; AS03, an α-tocopherol-containing oil-in-water emulsion; AS37, a Toll-like receptor 7 (TLR7) agonist adsorbed to alum; CpG1018-alum, a TLR9 agonist formulated in alum; and alum. RBD-NP immunization with AS03, CpG1018-alum, AS37 or alum induced substantial neutralizing-antibody and CD4 T cell responses, and conferred protection against SARS-CoV-2 infection in the pharynges, nares and bronchoalveolar lavage. The neutralizing-antibody response to live virus was maintained up to 180 days after vaccination with RBD-NP in AS03 (RBD-NP-AS03), and correlated with protection from infection. RBD-NP immunization cross-neutralized the B.1.1.7 SARS-CoV-2 variant efficiently but showed a reduced response against the B.1.351 variant. RBD-NP-AS03 produced a 4.5-fold reduction in neutralization of B.1.351 whereas the group immunized with RBD-NP-AS37 produced a 16-fold reduction in neutralization of B.1.351, suggesting differences in the breadth of the neutralizing-antibody response induced by these adjuvants. Furthermore, RBD-NP-AS03 was as immunogenic as a prefusion-stabilized spike immunogen (HexaPro) with AS03 adjuvant. These data highlight the efficacy of the adjuvanted RBD-NP vaccine in promoting protective immunity against SARS-CoV-2 and have led to phase I/II clinical trials of this vaccine (NCT04742738 and NCT04750343).

PubMed Disclaimer

Update of

  • Adjuvanting a subunit SARS-CoV-2 nanoparticle vaccine to induce protective immunity in non-human primates.
    S Arunachalam P, Walls AC, Golden N, Atyeo C, Fischinger S, Li C, Aye P, Navarro MJ, Lai L, Edara VV, Roltgen K, Rogers K, Shirreff L, Ferrell DE, Wrenn S, Pettie D, Kraft JC, Miranda MC, Kepl E, Sydeman C, Brunette N, Murphy M, Fiala B, Carter L, White AG, Trisal M, Hsieh CL, Russell-Lodrigue K, Monjure C, Dufour J, Doyle-Meyer L, Bohm RB, Maness NJ, Roy C, Plante JA, Plante KS, Zhu A, Gorman MJ, Shin S, Shen X, Fontenot J, Gupta S, O Hagan DT, Most RV, Rappuoli R, Coffman RL, Novack D, McLellan JS, Subramaniam S, Montefiori D, Boyd SD, Flynn JL, Alter G, Villinger F, Kleanthous H, Rappaport J, Suthar M, King NP, Veesler D, Pulendran B. S Arunachalam P, et al. bioRxiv [Preprint]. 2021 Feb 11:2021.02.10.430696. doi: 10.1101/2021.02.10.430696. bioRxiv. 2021. Update in: Nature. 2021 Jun;594(7862):253-258. doi: 10.1038/s41586-021-03530-2. PMID: 33594366 Free PMC article. Updated. Preprint.

References

    1. Krammer, F. SARS-CoV-2 vaccines in development. Nature 586, 516–527 (2020). - PubMed - DOI
    1. Pollard, A. J. & Bijker, E. M. A guide to vaccinology: from basic principles to new developments. Nat. Rev. Immunol. 21, 83–100 (2021). - PubMed - DOI
    1. Pulendran, B., S Arunachalam, P. & O’Hagan, D. T. Emerging concepts in the science of vaccine adjuvants. Nat. Rev. Drug Discov. https://doi.org/10.1038/s41573-021-00163-y (2021).
    1. Thanh Le, T. et al. The COVID-19 vaccine development landscape. Nat. Rev. Drug Discov. 19, 305–306 (2020). - PubMed - DOI
    1. Walls, A. C. et al. Elicitation of potent neutralizing antibody responses by designed protein nanoparticle vaccines for SARS-CoV-2. Cell 183, 1367–1382 (2020). - PubMed - PMC - DOI

Publication types

MeSH terms

Associated data