Publication: Nonstructural protein 1 antibody-based epitope-Blocking enzyme-linked immunosorbent assay to differentiate Japanese encephalitis virus from dengue virus infections in humans
Issued Date
2011-08-05
Resource Type
ISSN
18842836
13446304
13446304
Other identifier(s)
2-s2.0-79960985155
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Japanese Journal of Infectious Diseases. Vol.64, No.4 (2011), 284-291
Suggested Citation
Eiji Konishi, Mayu Konishi Nonstructural protein 1 antibody-based epitope-Blocking enzyme-linked immunosorbent assay to differentiate Japanese encephalitis virus from dengue virus infections in humans. Japanese Journal of Infectious Diseases. Vol.64, No.4 (2011), 284-291. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/12389
Research Projects
Organizational Units
Authors
Journal Issue
Thesis
Title
Nonstructural protein 1 antibody-based epitope-Blocking enzyme-linked immunosorbent assay to differentiate Japanese encephalitis virus from dengue virus infections in humans
Author(s)
Other Contributor(s)
Abstract
Japanese encephalitis virus (JEV) and the four dengue viruses (DENV1-4) are co-distributed in Southeast and South Asia. Since JEV is antigenically cross-reactive with DENV1-4, the differentiation between these viruses using antibody assays may be difficult. Herein, we describe the development of an epitope-blocking enzyme-linked immunosorbent assay (ELISA) using a monoclonal antibody specific for the nonstructural protein 1 (NS1) of JEV (JEV-NS1) to differentiate antibodies against JEV from those against DENV1-4. Hyperimmune mouse sera against JEV-NS1 showed > 60z inhibition, whereas those against NS1 of DENV1-4 showed < 30z inhibition. The present assay could therefore detect antibodies specific for JEV. For testing of human sera, a temporary cutoff value (30.8z) was calculated the average and standard deviation obtained for sera of control humans negative for JEV antibodies. Human sera positive for antibodies to any of DENV1-4 NS1 but negative for antibodies to JEV-NS1 showed a lower percentage inhibition than the cutoff value. On the other hand, sera with JEV-NS1 antibody levels of ≥0.400, as determined by the conventional ELISA (medially/strongly positive for JEV-NS1 antibodies), showed percentage inhibition greater than the cutoff. Although this blocking ELISA afforded false-negative results for most sera that were weakly positive for JEV-NS1 antibodies, it may be useful for investigating the seroepidemiology of JEV antibodies in dengue-endemic areas.