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Department of Microbiology, University of Tennessee, Knoxville
Correspondence: Dr. Barry T. Rouse, Distinguished Professor of Microbiology, M409 Walters Life Sciences Building, University of Tennessee, Knoxville, TN 37996. E-mail: btr{at}utk.edu
The report shows that CpG can exert additional adjuvant effects by inducing cells that are normally inferior antigen (Ag)-presenting cells to participate in immune induction by cross-priming. Macrophages (M
) exposed to protein Ag in the presence of bioactive CpG DNA released material that induced primary CD8+ T cell responses in DC-naïve T cell cultures. This cross-priming event was accompanied by up-regulation of the stress protein response as well as inflammatory cytokine expression in treated M
. The material released was indicated to contain inducible heat shock protein-70 and epitope peptide, which in turn, were presented by dendritic cells (DCs) to responder T cells. Such an adjuvant effect by CpG may serve to salvage immunogenic material from otherwise inert depot cellular sites and additionally stimulate DCs to effectively cross-prime. The cross-priming, shown also to occur in vivo, may be particularly useful when Ag doses are low and have minimal opportunity for delivery to DCs for consequent direct priming.
Key Words: hsp70 cross-priming chaperone DC M
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