Papers Published

  1. Song, R. J. and Liu, S. Q. and Leong, K. W., Effects of MIP-1 alpha, MIP-3 alpha, and MIP-3 beta on the induction of HIV Gag-specific immune response with DNA vaccines, Molecular Therapy, vol. 15 no. 5 (2007), pp. 1007-1015 .
    (last updated on 2010/06/11)

    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-3 beta 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-3 beta 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.

    Keywords:
    herpes-simplex-virus experimental autoimmune encephalomyelitis inflammatory protein 3-alpha cc-chemokine receptor dendritic cells expression plasmid t-lymphocytes in-vivo gm-csf type-1