Development of a simple, rapid, sensitive, high-throughput luciferase reporter based microneutralization test for measurement of virus neutralizing antibodies following Respiratory Syncytial Virus vaccination and infection.

We have established a new reporter gene-based RSV neutralization test using Renilla luciferase. The RSV-Luciferase Neutralization Test (RSV-Luc-NeuT) is a simple, rapid, high throughput, and less labor intensive functional serological assay than the traditional RSV-PRNT, capable of measuring a broad range of anti-RSV neutralizing antibodies targeting both RSV-F and RSV-G proteins. Specificity and sensitivity of the RSV-Luc-NeuT are comparable to the RSV-PRNT. Panels of pre-vaccination and post-vaccination animal sera, monoclonal antibodies and animal polyclonal anti-RSV sera confirmed assay specificity. A panel of 60 human sera demonstrated high assay sensitivity for measurement of RSV neutralizing antibodies that strongly correlated with the RSV-PRNT titers (R(2)=0.864). Neutralization in the presence of guinea pig complement (GPC) increased PRNT titers more than the RSV-Luc-NeuT neutralizing antibody titers for these human sera. This newly developed simple, high throughput, RSV-Luc-NeuT could be easily automated and applied in measurement of RSV neutralization titers in large vaccine trials.