Journal
VACCINE
Volume 24, Issue 2, Pages 195-205Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2005.07.059
Keywords
DNA vaccine; dengue virus; NS1
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Dengue is one of the most important arboviral diseases in humans, and although efforts over the last decades have dealt with the development of a vaccine, this vaccine is not available yet. In order to evaluate the potential of a DNA vaccine based on the non-structural 1 (NS 1) protein against dengue virus (DENV), we constructed the pcTPANS I plasmid which contains the secretory signal sequence derived from human tissue plasminogen activator (t-PA) fused to the full length of the DENV-2 NS I gene. Results indicate that pcTPANS I promotes correct expression of NS I in eukaryotic cells and drives secretion of the recombinant protein to the surrounding medium in a dimeric form. Balb/c mice, intramuscularly inoculated with this plasmid, presented high levels of antibodies, recognizing mainly surface-exposed conformational epitopes present in the NS I protein expressed by insect cells. Long-term antibody response was observed in animals 56 weeks after the first plasmid inoculation, and a rapid, efficient secondary response was observed after a DNA boost. Vaccinated animals were challenged against DENV-2 in two murine models, based on intracerebral (i.c.) and intraperitoneal (i.p.) virus inoculations, and in both cases, pcTPANSI-immunized mice were protected. Overall, these results provide further support for the use of such a plasmid in a possible approach for the development of a vaccine against DENV. (c) 2005 Elsevier Ltd. All rights reserved.
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