SARS-CoV-2 vaccination induces neutralizing antibodies against pandemic and pre-emergent SARS-related coronaviruses in monkeys

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Abstract

Betacoronaviruses (betaCoVs) caused the severe acute respiratory syndrome (SARS) and Middle East Respiratory Syndrome (MERS) outbreaks, and now the SARS-CoV-2 pandemic. Vaccines that elicit protective immune responses against SARS-CoV-2 and betaCoVs circulating in animals have the potential to prevent future betaCoV pandemics. Here, we show that immunization of macaques with a multimeric SARS-CoV-2 receptor binding domain (RBD) nanoparticle adjuvanted with 3M-052-Alum elicited cross-neutralizing antibody responses against SARS-CoV-1, SARS-CoV-2, batCoVs and the UK B.1.1.7 SARS-CoV-2 mutant virus. Nanoparticle vaccination resulted in a SARS-CoV-2 reciprocal geometric mean neutralization titer of 47,216, and robust protection against SARS-CoV-2 in macaque upper and lower respiratory tracts. Importantly, nucleoside-modified mRNA encoding a stabilized transmembrane spike or monomeric RBD protein also induced SARS-CoV-1 and batCoV cross-neutralizing antibodies, albeit at lower titers. These results demonstrate current mRNA vaccines may provide some protection from future zoonotic betaCoV outbreaks, and provide a platform for further development of pan-betaCoV nanoparticle vaccines.

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  1. SciScore for 10.1101/2021.02.17.431492: (What is this?)

    Please note, not all rigor criteria are appropriate for all manuscripts.

    Table 1: Rigor

    Institutional Review Board StatementIACUC: The study protocol and all veterinarian procedures were approved by the Bioqual IACUC per a memorandum of understanding with the Duke IACUC, and were performed based on standard operating procedures.
    RandomizationFor clusters of size >5, 5 spike sequences were randomly downsampled from each cluster.
    Blindingnot detected.
    Power Analysisnot detected.
    Sex as a biological variablenot detected.
    Cell Line Authenticationnot detected.

    Table 2: Resources

    Antibodies
    SentencesResources
    To measure dissociation of the antibody-RBD-scNP complex, the tip was incubated in PBS for 600 s.
    antibody-RBD-scNP
    suggested: None
    Plasma IgG blocking of RBD monoclonal antibody binding: Blocking assays for DH1041 and DH1047 were performed as stated above for ACE2, except plates were coated with either DH1041 or DH1047 instead of ACE2.
    ACE2
    suggested: None
    Antibody-virus and virus only mixtures were then incubated at 37°C with 5% CO2 for one hour.
    Antibody-virus
    suggested: None
    Experimental Models: Cell Lines
    SentencesResources
    The SARS-CoV-2 RBD was expressed in Freestyle293 cells and purified by StrepTactin affinity chromatography (IBA) and superdex200 size exclusion chromatography as stated above.
    Freestyle293
    suggested: ATCC Cat# PTA-5080, RRID:CVCL_D603)
    Pseudovirions were produced in HEK 293T/17 cells (ATCC cat. no. CRL-11268) by transfection using Fugene 6 (Promega, Catalog #E2692).
    HEK 293T/17
    suggested: ATCC Cat# CRL-11268, RRID:CVCL_1926)
    For the 96-well neutralization assay, Vero E6 USAMRID cells were plated at 20,000 cells per well the day prior in clear bottom black walled plates.
    Vero E6
    suggested: None
    Software and Algorithms
    SentencesResources
    The binding response at the end of the 400 s association phase was plotted in GraphPad Prism v9.0.
    GraphPad Prism
    suggested: (GraphPad Prism, RRID:SCR_002798)
    Processing of negative stain images: The RELION 3.0 program was used for all negative stain image processing.
    RELION
    suggested: (RELION, RRID:SCR_016274)
    Betacoronavirus sequence analysis: Heatmaps of amino acid sequence similarity were computed for a representative set of betacoronaviruses using the ComplexHeatmap package in R.
    ComplexHeatmap
    suggested: (ComplexHeatmap, RRID:SCR_017270)
    To map group 2b betaCoV sequence conservation onto the RBD structure, group 2b spike sequences were retrieved from Genbank and clustered using USEARCH 67 with a sequence identity threshold of 0.99 resulting in 39 clusters.
    USEARCH
    suggested: (mubiomics, RRID:SCR_006785)
    The resulting set of 73 sequences was aligned using MAFFT 68.
    MAFFT
    suggested: (MAFFT, RRID:SCR_011811)
    The conservation scores were then mapped to the RBD domain coordinates (PDB: 7LD1) and images rendered with PyMol version 2.3.5.
    PyMol
    suggested: (PyMOL, RRID:SCR_000305)
    Statistics Analysis: Data were plotted using Prism GraphPad 8.0.
    GraphPad
    suggested: (GraphPad Prism, RRID:SCR_002798)
    Wilcoxon rank sum exact test was performed to compare differences between groups with p-value < 0.05 considered significant using SAS 9.4 (SAS Institute, Cary, NC).
    SAS Institute
    suggested: (Statistical Analysis System, RRID:SCR_008567)

    Results from OddPub: We did not detect open data. We also did not detect open code. Researchers are encouraged to share open data when possible (see Nature blog).


    Results from LimitationRecognizer: An explicit section about the limitations of the techniques employed in this study was not found. We encourage authors to address study limitations.

    Results from TrialIdentifier: We found the following clinical trial numbers in your paper:

    IdentifierStatusTitle
    NCT04177355RecruitingEvaluating the Safety and Immunogenicity of HIV-1 BG505 SOSI…


    Results from Barzooka: We did not find any issues relating to the usage of bar graphs.


    Results from JetFighter: Please consider improving the rainbow (“jet”) colormap(s) used on page 34. At least one figure is not accessible to readers with colorblindness and/or is not true to the data, i.e. not perceptually uniform.


    Results from rtransparent:
    • Thank you for including a conflict of interest statement. Authors are encouraged to include this statement when submitting to a journal.
    • Thank you for including a funding statement. Authors are encouraged to include this statement when submitting to a journal.
    • No protocol registration statement was detected.

    About SciScore

    SciScore is an automated tool that is designed to assist expert reviewers by finding and presenting formulaic information scattered throughout a paper in a standard, easy to digest format. SciScore checks for the presence and correctness of RRIDs (research resource identifiers), and for rigor criteria such as sex and investigator blinding. For details on the theoretical underpinning of rigor criteria and the tools shown here, including references cited, please follow this link.