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2009-06-21Zeitschriftenartikel DOI: 10.1186/1742-4690-6-60
Role of complement and antibodies in controlling infection with pathogenic simian immunodeficiency virus (SIV) in macaques vaccinated with replication-deficient viral vector
Falkensammer, Barbara
Rubner, Barbara
Hiltgartner, Alexander
Wilflingseder, Doris
Stahl-Hennig, Christiane
Kuate, Seraphin
Ueberla, Klaus
Norley, Stephen
Strasak, Alexander
Racz, Paul
Stoiber, Heribert
Background: We investigated the interplay between complement and antibodies upon priming with single-cycle replicating viral vectors (SCIV) encoding SIV antigens combined with Adeno5-SIV or SCIV pseudotyped with murine leukemia virus envelope boosting strategies. The vaccine was applied via spray-immunization to the tonsils of rhesus macaques and compared with systemic regimens. Results: Independent of the application regimen or route, viral loads were significantly reduced after challenge with SIVmac239 (p < 0.03) compared to controls. Considerable amounts of neutralizing antibodies were induced in systemic immunized monkeys. Most of the sera harvested during peak viremia exhibited a trend with an inverse correlation between complement C3-deposition on viral particles and plasma viral load within the different vaccination groups. In contrast, the amount of the observed complement-mediated lysis did not correlate with the reduction of SIV titres. Conclusion: The heterologous prime-boost strategy with replication-deficient viral vectors administered exclusively via the tonsils did not induce any neutralizing antibodies before challenge. However, after challenge, comparable SIV-specific humoral immune responses were observed in all vaccinated animals. Immunization with single cycle immunodeficiency viruses mounts humoral immune responses comparable to live-attenuated immunodeficiency virus vaccines.
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DOI
10.1186/1742-4690-6-60
Permanent URL
https://doi.org/10.1186/1742-4690-6-60
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<a href="https://doi.org/10.1186/1742-4690-6-60">https://doi.org/10.1186/1742-4690-6-60</a>