2026-06-14T05:08:05Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/142422024-09-27T20:15:08Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19609

00925njm 22002777a 4500 dc Zheng, Yue author Larragoite, Erin T author Williams, Elizabeth S C P author Lama, Juan author Cisneros, Isabel author Delgado, Julio C author Slev, Patricia author Rychert, Jenna author Innis, Emily A author Coiras, Mayte author Rondina, Matthew T author Spivak, Adam M author Planelles, Vicente author 2021-01-04 Background: Virus neutralization by antibodies is an important prognostic factor in many viral diseases. To easily and rapidly measure titers of neutralizing antibodies in serum or plasma, we developed pseudovirion particles composed of the spike glycoprotein of SARS-CoV-2 incorporated onto murine leukemia virus capsids and a modifed minimal murine leukemia virus genome encoding frefy luciferase. This assay design is intended for use in laboratories with biocontainment level 2 and therefore circumvents the need for the biocontainment level 3 that would be required for replication-competent SARS-CoV-2 virus. To validate the pseudovirion assay, we set up comparisons with other available antibody tests including those from Abbott, Euroimmun and Siemens, using archived, known samples. Results: 11 out of 12 SARS-CoV-2-infected patient serum samples showed neutralizing activity against SARS-CoV2-spike pseudotyped MLV viruses, with neutralizing titers-50 (NT50) that ranged from 1:25 to 1:1,417. Five historical samples from patients hospitalized for severe infuenza infection in 2016 tested negative in the neutralization assay (NT50<25). Three serum samples with high neutralizing activity against SARS-CoV-2/MLV pseudoviruses showed no detectable neutralizing activity (NT50<25) against SARS-CoV-1/MLV pseudovirions. We also compared the semiquantitative Siemens SARS-CoV-2 IgG test, which measures binding of IgG to recombinantly expressed receptor binding domain of SARS-CoV-2 spike glycoprotein with the neutralization titers obtained in the pseudovirion assay and the results show high concordance between the two tests (R2=0.9344). Conclusions: SARS-CoV-2 spike/MLV pseudovirions provide a practical means of assessing neutralizing activity of antibodies in serum or plasma from infected patients under laboratory conditions consistent with biocontainment level 2. This assay ofers promise also in evaluating immunogenicity of spike glycoprotein-based candidate vaccines in the near future. Virol J. 2021 Jan 4;18(1):1. 10.1186/s12985-020-01472-1 1743-422X Virology Journal 33397387 http://hdl.handle.net/20.500.12105/14242 COVID-19 Coronavirus SARS SARS-CoV-2 Neutralization assay Pseudotyped virus Murine leukemia virus Antibody Spike Neutralization Assay with SARS-CoV-1 and SARS-CoV-2 Spike Pseudotyped Murine Leukemia Virions