Effects of MIP-1 alpha, MIP-3 alpha, and MIP-3 beta on the induction of HIV Gag-specific immune response with DNA vaccines
- PMID: 17356539
- PMCID: PMC2365720
- DOI: 10.1038/mt.sj.6300129
Effects of MIP-1 alpha, MIP-3 alpha, and MIP-3 beta on the induction of HIV Gag-specific immune response with DNA vaccines
Abstract
Transfection of DNA vaccines with chemokines may recruit dendritic cells (DCs) locally to capture the antigenic genes and their gene products to generate enhanced CD8(+) cytotoxic T lymphocytes (CTLs). In this study, we investigated the effects of macrophage inflammatory protein (MIP)-1 alpha, MIP-3 alpha, and MIP-3beta on human immunodeficiency virus (HIV) Gag DNA vaccination. The chemokine plasmids markedly enhanced the local infiltration of inflammatory cells and increased the presence of CD11c(+) B7.2(+)-activated DCs. MIP-1 alpha and MIP-3 alpha were potent adjuvants in augmenting CTLs and afforded strong protection to immunized animals against challenge with vaccinia virus expressing Gag (vv-Gag). However, decreased humoral response was observed. MIP-3beta plasmid did not dramatically alter immunity. The chemokine inoculation time with respect to DNA vaccine priming was also investigated. The injection of pMIP-3 alpha three days before Gag plasmid (pGag) vaccination markedly increased specific CTLs compared with simultaneous injection and led to higher protection against vv-Gag. Immunity was also shifted toward a T-helper type-1 (Th1) response. In contrast, inoculation with pMIP-3 alpha three days after pGag vaccination shifted immunity toward a Th2 response. Our data suggest that administration of a chemokine with DNA vaccines offers a valuable strategy to modulate the efficacy and polarization of specific immunity and that chemokine-antigen timing is critical in determining overall biological effects.
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