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Immune Responses against a New HIV-1 p24-gp41/pCAGGS-IL-12 DNA Vaccine in Balb/c Mice | ||
| Iranian Journal of Immunology | ||
| مقاله 2، دوره 9، شماره 2، شهریور 2012، صفحه 86-97 اصل مقاله (484.37 K) | ||
| نوع مقاله: Original Article | ||
| نویسندگان | ||
| Fatemeh Roodbari1، 2؛ Farzaneh Sabahi1؛ Mohamad Nabi Sarbolouki3؛ Farzaneh Barkhordari4؛ Ahmad Adeli4؛ Amel Jamedar1، 5؛ Fereidoun Mahboudi* 4 | ||
| 1Department of Virology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran | ||
| 2Department of Cellular and Molecular Biology, Faculty of Basic Sciences, University of Mazandaran, Babolsar | ||
| 3Institute of Biochemistry and Biophysics, Tehran University of Basic Sciences | ||
| 4Biotechnology Research Center, Pasteur Institute of Iran, Tehran | ||
| 5Department of Microbiology and Virology, Faculty of Medicine, Mashad University of Medical Sciences, Mashad, Iran | ||
| چکیده | ||
| 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- 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- 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. | ||
| کلیدواژهها | ||
| Dendrosome؛ DNA vaccine؛ gp41؛ HIV-1؛ IL-12؛ p24 | ||
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