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APC Stimulated by CpG Oligodeoxynucleotide Enhance Activation of MHC Class I-Restricted T Cells
Journal article   Peer reviewed

APC Stimulated by CpG Oligodeoxynucleotide Enhance Activation of MHC Class I-Restricted T Cells

Thomas L Warren, Sudershan K Bhatia, Anna M Acosta, Christopher E Dahle, Timothy L Ratliff, Arthur M Krieg and George J Weiner
The Journal of immunology (1950), Vol.165(11), pp.6244-6251
12/01/2000
DOI: 10.4049/jimmunol.165.11.6244
PMID: 11086059

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Abstract

Oligonucleotides containing unmethylated CpG motifs (cytosine-phosphorothioate-guanine oligodeoxynucleotide (CpG ODN)) are potent immunostimulatory agents capable of enhancing the Ag-specific Th1 response when used as immune adjuvants. We evaluated the cellular mechanisms responsible for this effect. Development of a CTL response was enhanced when mice were immunized with peptide-pulsed dendritic cells (DCs) treated with CpG ODN. However, in vitro, CpG ODN had no direct effect on highly purified T cells. In vitro, CpG ODN treatment of peptide- or protein-pulsed DCs enhanced the ability of the DCs to activate class I-restricted T cells. The presence of helper T cells enhanced this effect, indicating that treatment with CpG ODN does not obviate the role of T cell help. The enhanced ability of CpG ODN-treated DCs to activate T cells was present but blunted when DCs derived from IL-12 knockout mice were used. Fixation of Ag-pulsed, CpG ODN-treated DCs limited their ability to activate T cells. In contrast, fixation had little effect on DC activation of T cells when DCs were not exposed to CpG ODN. This indicates that production of soluble factors by DCs stimulated with CpG ODN plays a particularly important role in their ability to activate class I-restricted T cells. We conclude that CpG ODN enhances the development of a cellular immune response by stimulating APCs such as DCs, to produce IL-12 and other soluble factors.

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