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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Identification of Immunostimulatory Oligodeoxynucleotide from Escherichia coli Genomic DNA

  • Choi, Yong-Jun (Department of Biochemistry, College of Science, Yonsei University) ;
  • Lee, Keun-Wook (Center for Medical Science Research, Hallym University) ;
  • Kwon, Hyung-Joo (Center for Medical Science Research, Hallym University) ;
  • Kim, Doo-Sik (Department of Biochemistry, College of Science, Yonsei University)
  • Received : 2006.07.10
  • Accepted : 2006.07.19
  • Published : 2006.11.30
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Abstract

Bacterial DNA containing immunostimulatory CpG motifs can stimulate antigen-presenting cells to express co-stimulatory molecules and to produce various cytokines in vivo and in vitro. In this study, we fragmented macromolecular E.coli genomic DNA with DNase I, and analyzed the ability of the resulting DNA fragments to induce the NF-${\kappa}B$ activation and humoral immune response. Furthermore, using computational analysis and luciferase assay for synthetic ODNs based on the sequence of the immunostimulatory DNA fragments (DF-ODNs), an active component of DF-ODNs sequences was investigated. Experimental results demonstrated that DF-ODN is optimal for the NF-${\kappa}B$-responsive promoter activation in the mouse macrophage cell line and the humoral immune response in vivo. In agreement with the activity of the DF-ODNs processed by DNase I, a synthetic ODN based on the DF-ODN sequences is potent at inducing IL-12 mRNA expression in primary dendritic cells. These results suggest that the discovery and characterization of a highly active natural CpG-ODN may be achieved by the analyses of bacterial DNA fragments generated by a nuclease activity.

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References

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