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Protection against Mucosal SHIV Challenge by Peptide and Helper-Dependent Adenovirus Vaccines
- Source :
- Viruses, Vol 1, Iss 3, Pp 920-938 (2009)
- Publication Year :
- 2009
- Publisher :
- MDPI AG, 2009.
-
Abstract
- Groups of rhesus macaques that had previously been immunized with HIV-1 envelope (env) peptides and first generation adenovirus serotype 5 (FG-Ad5) vaccines expressing the same peptides were immunized intramuscularly three times with helperdependent adenovirus (HD-Ad) vaccines expressing only the HIV-1 envelope from JRFL. No gag, pol, or other SHIV genes were used for vaccination. One group of the FG-Ad5-immune animals was immunized three times with HD-Ad5 expressing env. One group was immunized by serotype-switching with HD-Ad6, HD-Ad1, and HD-Ad2 expressing env. Previous work demonstrated that serum antibody levels against env were significantly higher in the serotype-switched group than in the HD-Ad5 group. In this study, neutralizing antibody and T cell responses were compared between the groups before and after rectal challenge with CCR5-tropic SHIV-SF162P3. When serum samples were assayed for neutralizing antibodies, only weak activity was observed. T cell responses against env epitopes were higher in the serotype-switched group. When these animals were challenged rectally with SHIV-SF162P3, both the Ad5 and serotype-switch groups significantly reduced peak viral loads 2 to 10-fold 2 weeks after infection. Peak viral loads were significantly lower for the serotype-switched group as compared to the HD-Ad5-immunized group. Viral loads declined over 18 weeks after infection with some animals viremia reducing nearly 4 logs from the peak. These data demonstrate significant mucosal vaccine effects after immunization with only env antigens. These data also demonstrate HD-Ad vectors are a robust platform for vaccination.
Details
- Language :
- English
- ISSN :
- 19994915
- Volume :
- 1
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Viruses
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.2b8167587b654e02bfbe294e372102c2
- Document Type :
- article
- Full Text :
- https://doi.org/10.3390/v1030920