Rapid protection from COVID-19 in nonhuman primates vaccinated intramuscularly but not intranasally with a single dose of a recombinant vaccine
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Abstract
The ongoing pandemic of Coronavirus disease 2019 (COVID-19) continues to exert a significant burden on health care systems worldwide. With limited treatments available, vaccination remains an effective strategy to counter transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Recent discussions concerning vaccination strategies have focused on identifying vaccine platforms, number of doses, route of administration, and time to reach peak immunity against SARS-CoV-2. Here, we generated a single dose, fast-acting vesicular stomatitis virus-based vaccine derived from the licensed Ebola virus (EBOV) vaccine rVSV-ZEBOV, expressing the SARS-CoV-2 spike protein and the EBOV glycoprotein (VSV-SARS2-EBOV). Rhesus macaques vaccinated intramuscularly (IM) with a single dose of VSV-SARS2-EBOV were protected within 10 days and did not show signs of COVID-19 pneumonia. In contrast, intranasal (IN) vaccination resulted in limited immunogenicity and enhanced COVID-19 pneumonia compared to control animals. While IM and IN vaccination both induced neutralizing antibody titers, only IM vaccination resulted in a significant cellular immune response. RNA sequencing data bolstered these results by revealing robust activation of the innate and adaptive immune transcriptional signatures in the lungs of IM-vaccinated animals only. Overall, the data demonstrates that VSV-SARS2-EBOV is a potent single-dose COVID-19 vaccine candidate that offers rapid protection based on the protective efficacy observed in our study.
One sentence summary
VSV vaccine protects NHPs from COVID-19 in 10 days
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SciScore for 10.1101/2021.01.19.426885: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Institutional Review Board Statement IACUC: All procedures followed standard operating procedures (SOPs) approved by the RML Institutional Biosafety Committee ( Randomization The NHPs were randomly selected for two vaccine groups (n=6) and one control group (n=4). Blinding not detected. Power Analysis not detected. Sex as a biological variable Animal study: Sixteen female rhesus macaques (3.5-10 years of age; 4.5-10kg, Indian-origin) were used in this study. Cell Line Authentication not detected. Table 2: Resources
Antibodies Sentences Resources After horse-radish peroxidase (HRP)-labeled secondary antibody staining using either anti-mouse IgG (1:10,000) or anti-rabbit IgG (1:5000) (Jackson ImmunoResearch), the … SciScore for 10.1101/2021.01.19.426885: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Institutional Review Board Statement IACUC: All procedures followed standard operating procedures (SOPs) approved by the RML Institutional Biosafety Committee ( Randomization The NHPs were randomly selected for two vaccine groups (n=6) and one control group (n=4). Blinding not detected. Power Analysis not detected. Sex as a biological variable Animal study: Sixteen female rhesus macaques (3.5-10 years of age; 4.5-10kg, Indian-origin) were used in this study. Cell Line Authentication not detected. Table 2: Resources
Antibodies Sentences Resources After horse-radish peroxidase (HRP)-labeled secondary antibody staining using either anti-mouse IgG (1:10,000) or anti-rabbit IgG (1:5000) (Jackson ImmunoResearch), the blots were imaged using the SuperSignal West Pico chemiluminescent substrate (Thermo Fisher Scientific) and an iBright™ CL1500 Imaging System (Thermo Fisher Scientific) anti-mouse IgGsuggested: (LSBio (LifeSpan Cat# LS-C69682-5000, RRID:AB_1653096)anti-rabbit IgGsuggested: NoneAfter 3 washes with PBST, the bound antibodies were labeled using 50 μl of 1:2,500 horse-radish peroxidase (HRP)-labeled anti-monkey IgG (H+L) (SeraCare Life Sciences) diluted in 1% skim milk in PBST. anti-monkey IgGsuggested: NoneSpecific anti-CoV immunoreactivity was detected using an in-house SARS-CoV-2 nucleocapsid protein (U864YFA140-4/CB2093) rabbit antibody (Genscript) at a 1:1000 dilution. SARS-CoV-2 nucleocapsid protein ( U864YFA140-4/CB2093 )suggested: NoneExperimental Models: Cell Lines Sentences Resources Cells and Viruses: Huh7 and VeroE6 cells were grown at 37°C and 5% CO2 in Dulbecco’s modified Eagle’s medium (DMEM) (Sigma-Aldrich, St. Louis, MO) containing 10% fetal bovine serum (FBS) (Wisent Inc., St. Bruno, Canada), 2 mM L-glutamine (Thermo Fisher Scientific, Waltham, MA), 50 U/mL penicillin (Thermo Fisher Scientific), and 50 μg/mL streptomycin (Thermo Fisher Scientific). Huh7suggested: NoneThe replication-competent recombinant VSV was recovered in BHK-T7 cells as described previously (26). BHK-T7suggested: NoneFinally, media was removed from cells and the mixture was added to VeroE6 cells and incubated at 37°C and 5% CO2 for 6 days. VeroE6suggested: JCRB Cat# JCRB1819, RRID:CVCL_YQ49)Software and Algorithms Sentences Resources Sample acquisition was performed on a Cytoflex-S (Beckman Coulter) and data analyzed in FlowJo V10 (TreeStar). FlowJosuggested: (FlowJo, RRID:SCR_008520)RNA-Seq reads were demultiplexed, quality-filtered and trimmed using Trim Galore (average Phred score cut-off of 30, minimum length of 50 bp). Trim Galoresuggested: (Trim Galore, RRID:SCR_011847)FastQC was used to generate quality reports. FastQCsuggested: (FastQC, RRID:SCR_014583)Hisat2 was used to align reads to the reference genome Macaca mulatta (Macaca_mulatta.Mmul_8.0.1.dna.toplevel.fa) and the Macaca_mulatta.Mmul_8.0.1.97.gtf was used for annotation. Hisat2suggested: (HISAT2, RRID:SCR_015530)Raw expression values (gene-level read counts) were generated using the summarizeOverlaps function and normalized (read per kilobase of transcript per million mapped reads, rpkm) using the edgeR package. edgeRsuggested: (edgeR, RRID:SCR_012802)Functional enrichment of DEGs was performed using Metascape to identify relevant Gene Ontology (GO) biological process terms and KEGG pathways. Metascapesuggested: (Metascape, RRID:SCR_016620)KEGGsuggested: (KEGG, RRID:SCR_012773)In silico flow cytometry was performed using ImmQuant with the IRIS database. IRISsuggested: None, Venn diagrams and violin plots were generated using R packages ggplot2 and VennDiagrams. ggplot2suggested: (ggplot2, RRID:SCR_014601)GO network plots were generated in Cytoscape (Version 3.5.1). Cytoscapesuggested: (Cytoscape, RRID:SCR_003032)Graphs were generated using GraphPad Prism software (version 8). GraphPad Prismsuggested: (GraphPad Prism, RRID:SCR_002798)Statistical analyses: All statistical analysis was performed in Prism 8 (GraphPad). GraphPadsuggested: (GraphPad Prism, RRID:SCR_002798)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: No clinical trial numbers were referenced.
Results from Barzooka: We did not find any issues relating to the usage of bar graphs.
Results from JetFighter: We did not find any issues relating to colormaps.
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.
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