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Updated: May 9, 2026
Optimization of a Quantitative Micro-neutralization Assay
Published on: December 14, 2016
A new method for the detection of neutralizing antibodies against mumps virus
Keita Matsubara1, Motoko Fujino, Kaoru Takeuchi
1Department of Pediatrics, Hiroshima Prefectural Hospital, Minami-ku, Hiroshima City, Hiroshima, Japan.
Abstract:
Neutralization test is the most reliable method of evaluating immunity against viral diseases but there is no standard procedure for mumps virus, with tests differing in the infectivity of the challenge virus, 50% plaque reduction or complete inhibition of cytopathic effects (CPE), and usage of complement. A reliable, easy, and simple neutralization test for mumps virus was developed in this study. A recombinant mumps virus expressing GFP was generated as a challenge virus. Complement was added to the neutralizing mixture at 1∶200 when stocked serum samples were used. Neutralizing antibody titers were expressed as the reciprocal of the highest dilution that did not exceed two-fold of FU values (GFP expression) of the cell control wells. A total of 1,452 serum samples were assayed by inhibition of GFP expression in comparison with those examined by conventional 100% inhibition of CPE. 1,367 (94.1%) showed similar neutralizing antibody titers when examined by both methods. The GFP expression inhibition assay, using a recombinant mumps virus expressing GFP, is a simple and time- saving method.
Insights
A new, reliable neutralization test for mumps virus immunity was developed using a GFP-expressing virus. This simple assay accurately measures neutralizing antibody titers, offering a time-saving alternative to traditional methods.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Neutralization tests are crucial for assessing viral immunity but lack standardization for mumps virus.
- Existing methods vary in challenge virus infectivity, endpoint determination (50% plaque reduction vs. complete inhibition), and complement use.
Purpose of the Study:
- To develop a reliable, easy, and simple neutralization test for mumps virus.
- To establish a standardized method for quantifying mumps virus neutralizing antibodies.
Main Methods:
- Generation of a recombinant mumps virus expressing Green Fluorescent Protein (GFP) as a challenge virus.
- Addition of complement to neutralizing mixtures (1:200 dilution) for stocked serum samples.
- Quantification of neutralizing antibody titers based on GFP expression inhibition, compared to conventional cytopathic effect (CPE) inhibition.
Main Results:
- The developed GFP expression inhibition assay demonstrated high concordance (94.1%) with the conventional 100% CPE inhibition method.
- A total of 1,452 serum samples were successfully assayed, validating the method's robustness.
- The assay provides consistent and reproducible neutralizing antibody titer measurements.
Conclusions:
- The recombinant GFP-expressing mumps virus neutralization assay is a simple, reliable, and time-saving method for evaluating mumps virus immunity.
- This standardized approach improves the accuracy and efficiency of mumps virus antibody testing.
- The method facilitates better assessment of vaccine efficacy and natural infection-induced immunity.
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