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- W2036764630 abstract "A COS-1 cell line, stably transformed by a plasmid encoding the premembrane and envelope glycoproteins of Japanese encephalitis virus, produced a noninfectious recombinant antigen expressed as extracellular particles. Extracellular particles purified by equilibrium density centrifugation in sucrose gradients followed by electron microscopy were characterized as spherical particles with an average diameter of approximately 30 nm and a buoyant density of 1.15 g/cc. Purified extracellular particles were shown by western blot to contain premembrane, membrane and envelope proteins. The gradient-purified particles exhibited hemagglutination activity at the same pH optimum (6.6) as Japanese encephalitis virus. Recombinant antigen from cell culture fluid was concentrated by precipitation with polyethylene glycol and evaluated for immunogenicity in 8-10-week-old ICR mice. Groups of five mice received only one immunization of recombinant antigen with or without Freund's incomplete adjuvant. Mice immunized with recombinant antigen plus Freund's incomplete adjuvant elicited the highest anti-viral titers as determined by both enzyme-linked immunosorbent assay (ELISA) and plaque-reduction neutralization tests. The polyethylene glycol-concentrated recombinant antigen was also evaluated for use in IgM antibody-capture ELISA and indirect IgG ELISA. The IgM-capture ELISA results using recombinant antigen correlated well with the results of a similar test using Japanese encephalitis virus-infected mouse brain antigen for the analysis of serum samples from patients with symptoms of acute encephalitis. Similar IgG titers were observed in an indirect ELISA comparing recombinant antigen and purified Japanese encephalitis virus as plate-bound antigens. Based on these studies, this entirely safe, easily produced antigen that expresses authentic Japanese encephalitis virus envelope glycoprotein would provide an excellent alternative to standard viral antigens used in various ELISA formats." @default.
- W2036764630 created "2016-06-24" @default.
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- W2036764630 date "2001-09-01" @default.
- W2036764630 modified "2023-10-18" @default.
- W2036764630 title "A recombinant particulate antigen of Japanese encephalitis virus produced in stably-transformed cells is an effective noninfectious antigen and subunit immunogen" @default.
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- W2036764630 doi "https://doi.org/10.1016/s0166-0934(01)00346-9" @default.
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