Journal of Microbiology

Research Support, Non-U.S. Gov't

Newly Identified CpG ODNs, M5-30 and M6-395, Stimulate MouseNewly Identified CpG ODNs, M5-30 and M6-395, Stimulate Mouse Immune Cells to Secrete TNF-α and Enhance Th1-Mediated Immunity: Sun-Shim Choi , Eunkyung Chung , Yu-Jin Jung; J. Microbiol. 2010;48(4):512-517. Published online August 20, 2010; DOI: https://doi.org/10.1007/s12275-010-0053-6

Abstract: Bacterial CpG motifs are known to induce both innate and adaptive immunity in infected hosts via toll-like receptor 9 (TLR9). Because small oligonucleotides (ODNs) mimicking bacterial CpG motifs are easily synthesized, they have found use as immunomodulatory agents in a number of disease models. We have developed a novel bioinformatics approach to identify effective CpG ODN sequences and evaluate their function as TLR9 ligands in a murine system. Among the CpG ODNs we identified, M5-30 and M6-395 showed significant ability to stimulate TNF-α and IFN-γ production in a mouse macrophage cell line and mouse splenocytes, respectively. We also found that these CpG ODNs activated cells through the canonical NF-κB signaling pathway. Moreover, both CpG ODNs were able to induce Th1-mediated immunity in Mycobacterium tuberculosis (Mtb)-infected mice. Our results demonstrate that M5-30 and M6-395 function as TLR9-specific ligands, making them useful in the study of TLR9 functionality and signaling in mice.

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