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Protective efficacy in mice of a secreted form of recombinant dengue-2 virus envelope protein produced in baculovirus infected insect cells

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Summary

We constructed a recombinant baculovirus encoding a dengue (DEN)-2 virus envelope glycoprotein truncated of 102 amino acids (aa) at its C-terminus (D2EΔ102). The production, processing and transportation of the recombinant protein in baculovirus-infectedSpodoptera frugiperda (Sf9) cells and its immunogenic properties in mice were compared to those of a previously characterized recombinant DEN-2 E-protein with a 71aa C-terminal truncation (D2EΔ71). Both proteins were transported through the Golgi complex and their N-oligosaccharides of the high man-nose type were processed to the complex mannose type. D2EΔ102 transited to the plasma membrane and was secreted whereas D2EΔ71 presumably remained associated with the plasma membrane. The reactivities of the recombinant proteins with neutralizing monoclonal antibodies were similar. Both intracellular and extracellular D2EΔ102 induced neutralizing antibodies in mice and were thus immunogenic. The level of protective immunity to DEN-2 virus encephalitis challenge in mice vaccinated with intracellular D2EΔ102 (80%, p<0.01) was lower than that induced with D2EΔ71 (90%, P<0.001). Sixty-eight percent (P<0.001) of mice vaccinated with 5 µg of extracellular D2EΔ102 protein were protected against lethal challenge.

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Authors and Affiliations

  1. Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur, Paris, France

    Ch. Delenda, M. P. Frenkiel & V. Deubel

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  1. Ch. Delenda
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  2. M. P. Frenkiel
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  3. V. Deubel
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Delenda, C., Frenkiel, M.P. & Deubel, V. Protective efficacy in mice of a secreted form of recombinant dengue-2 virus envelope protein produced in baculovirus infected insect cells. Archives of Virology 139, 197–207 (1994). https://doi.org/10.1007/BF01309465

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  • DOI: https://doi.org/10.1007/BF01309465

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