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Immune Responses against a New HIV-1 p24-gp41/pCAGGS-IL-12 DNA Vaccine in Balb/c Mice.

Identifieur interne : 001937 ( Main/Exploration ); précédent : 001936; suivant : 001938

Immune Responses against a New HIV-1 p24-gp41/pCAGGS-IL-12 DNA Vaccine in Balb/c Mice.

Auteurs : Fatemeh Roodbari [Iran] ; Farzaneh Sabahi [Iran] ; Mohamad Nabi Sarbolouki [Iran] ; Farzaneh Barkhordari [Iran] ; Ahmad Adeli [Iran] ; Amel Jamedar [Iran] ; Fereidoun Mahboudi [Iran]

Source :

RBID : Hal:pasteur-00826030

Abstract

Background: Development of an effective vaccine is highly needed in order to restrict the AIDS pandemic. DNA vaccines initiate both arms of immunity without the potential of causing disease. HIV-1 p24 and gp41 (gag and env) proteins play important roles in viral pathogenesis and are effective candidates for immune induction and vaccine design. Objective: In this study, new DNA vaccine candidates constructed from HIV-1 fused p24-gp41 or gp41 alone were evaluated in Balb/c mice for induction of cellular and humoral immune responses. Methods: Recombinant plasmids, pcDNA3.1/Hygro expression vector containing immunogenic sequences of fused p24-gp41 or gp41alone were produced. Dendrosome used as a system for carrying vectors in laboratory animals, and an IL-12 containing vector (pCAGGS-IL-12) was co-immunized with the p24-gp41 vector as a genetic adjuvant. Induction of effective immune responses against the designed vectors as DNA vaccine candidates in Balb/c mice was evaluated. Levels of total antibodies, IgG isotypes (IgG2a and IgG1); IFN-γ and IL-4 were measured by ELISA. MTT assay was used to evaluate lymphoproliferation. Results: The results confirmed that the immunogenic epitopes of both p24 and gp41 genes are highly effective inducers of immune responses, and administration of fused p24-gp41 alone or along with IL-12 resulted in further enhancement of immune responses. Group 4 that received fused fragments (p24-gp41) along with an IL-12 expressing vector demonstrated a significantly higher Stimulation Index (SI) and IFN-γ production (p<0.0001) with a significant increase in IgG2a/IgG1 ratio, indicating the stimulation of CMI towards Th1. Although gp41 containing vector (group 6) also showed significant increases in both proliferation and IFN-γ production, the responses were persistently lower than that of p24-gp41 containing vectors. Total antibody production was highest in group 6 as expected. Conclusion: Dendrosome proved to be an efficient carrier of recombinant plasmids constructed in this study. Further studies are necessary to evaluate these constructs as HIV vaccine candidates.


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<term>gp41</term>
<term>p24</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">
<p>Background: Development of an effective vaccine is highly needed in order to restrict the AIDS pandemic. DNA vaccines initiate both arms of immunity without the potential of causing disease. HIV-1 p24 and gp41 (gag and env) proteins play important roles in viral pathogenesis and are effective candidates for immune induction and vaccine design. Objective: In this study, new DNA vaccine candidates constructed from HIV-1 fused p24-gp41 or gp41 alone were evaluated in Balb/c mice for induction of cellular and humoral immune responses. Methods: Recombinant plasmids, pcDNA3.1/Hygro expression vector containing immunogenic sequences of fused p24-gp41 or gp41alone were produced. Dendrosome used as a system for carrying vectors in laboratory animals, and an IL-12 containing vector (pCAGGS-IL-12) was co-immunized with the p24-gp41 vector as a genetic adjuvant. Induction of effective immune responses against the designed vectors as DNA vaccine candidates in Balb/c mice was evaluated. Levels of total antibodies, IgG isotypes (IgG2a and IgG1); IFN-γ and IL-4 were measured by ELISA. MTT assay was used to evaluate lymphoproliferation. Results: The results confirmed that the immunogenic epitopes of both p24 and gp41 genes are highly effective inducers of immune responses, and administration of fused p24-gp41 alone or along with IL-12 resulted in further enhancement of immune responses. Group 4 that received fused fragments (p24-gp41) along with an IL-12 expressing vector demonstrated a significantly higher Stimulation Index (SI) and IFN-γ production (p<0.0001) with a significant increase in IgG2a/IgG1 ratio, indicating the stimulation of CMI towards Th1. Although gp41 containing vector (group 6) also showed significant increases in both proliferation and IFN-γ production, the responses were persistently lower than that of p24-gp41 containing vectors. Total antibody production was highest in group 6 as expected. Conclusion: Dendrosome proved to be an efficient carrier of recombinant plasmids constructed in this study. Further studies are necessary to evaluate these constructs as HIV vaccine candidates.</p>
</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>Iran</li>
</country>
</list>
<tree>
<country name="Iran">
<noRegion>
<name sortKey="Roodbari, Fatemeh" sort="Roodbari, Fatemeh" uniqKey="Roodbari F" first="Fatemeh" last="Roodbari">Fatemeh Roodbari</name>
</noRegion>
<name sortKey="Adeli, Ahmad" sort="Adeli, Ahmad" uniqKey="Adeli A" first="Ahmad" last="Adeli">Ahmad Adeli</name>
<name sortKey="Barkhordari, Farzaneh" sort="Barkhordari, Farzaneh" uniqKey="Barkhordari F" first="Farzaneh" last="Barkhordari">Farzaneh Barkhordari</name>
<name sortKey="Jamedar, Amel" sort="Jamedar, Amel" uniqKey="Jamedar A" first="Amel" last="Jamedar">Amel Jamedar</name>
<name sortKey="Mahboudi, Fereidoun" sort="Mahboudi, Fereidoun" uniqKey="Mahboudi F" first="Fereidoun" last="Mahboudi">Fereidoun Mahboudi</name>
<name sortKey="Sabahi, Farzaneh" sort="Sabahi, Farzaneh" uniqKey="Sabahi F" first="Farzaneh" last="Sabahi">Farzaneh Sabahi</name>
<name sortKey="Sarbolouki, Mohamad Nabi" sort="Sarbolouki, Mohamad Nabi" uniqKey="Sarbolouki M" first="Mohamad Nabi" last="Sarbolouki">Mohamad Nabi Sarbolouki</name>
</country>
</tree>
</affiliations>
</record>

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