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DENGUE VIRUS AND VACCINES: HOW CAN DNA IMMUNIZATION CONTRIBUTE TO THIS CHALLENGE?
Vacinas de DNA
Imunização de impulso primordial
Proteína de envelope de dengue
Proteínas não estruturais da dengue
DNA Vaccines
Prime-boost immunization
Dengue envelope protein
Dengue non-structural proteins
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biotecnologia e Fisiologia de Infecções Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biotecnologia e Fisiologia de Infecções Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biotecnologia e Fisiologia de Infecções Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biotecnologia e Fisiologia de Infecções Virais. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biotecnologia e Fisiologia de Infecções Virais. Rio de Janeiro, RJ, Brasil.
Abstract
Dengue infections still have a tremendous impact on public health systems in most
countries in tropical and subtropical regions. The disease is systemic and dynamic
with broad range of manifestations, varying from mild symptoms to severe dengue
(Dengue Hemorrhagic Fever and Dengue Shock Syndrome). The only licensed tetravalent
dengue vaccine, Dengvaxia, is a chimeric yellow fever virus with prM and E genes
from the different dengue serotypes. However, recent results indicated that seronegative
individuals became more susceptible to develop severe dengue when infected after
vaccination, and now WHO recommends vaccination only to dengue seropositive
people. One possibility to explain these data is the lack of robust T-cell responses and
antibody-dependent enhancement of virus replication in vaccinated people. On the other
hand, DNA vaccines are excellent inducers of T-cell responses in experimental animals
and it can also elicit antibody production. Clinical trials with DNA vaccines have improved
and shown promising results regarding the use of this approach for human vaccination.
Therefore, in this paper we review preclinical and clinical tests with DNA vaccines against
the dengue virus. Most of the studies are based on the E protein since this antigen is
the main target for neutralizing antibody production. Yet, there are other reports with
DNA vaccines based on non-structural dengue proteins with protective results, as well.
Combining structural and non-structural genes may be a solution for inducing immune
responses aging in different infection moments. Furthermore, DNA immunizations are
also a very good approach in combining strategies for vaccines against dengue, in
heterologous prime/boost regimen or even administering different vaccines at the same
time, in order to induce efficient humoral and cellular immune responses.
Keywords in Portuguese
Vírus da DengueVacinas de DNA
Imunização de impulso primordial
Proteína de envelope de dengue
Proteínas não estruturais da dengue
Keywords
Dengue virusDNA Vaccines
Prime-boost immunization
Dengue envelope protein
Dengue non-structural proteins
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