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Kim, Dongbum; Jung, Jinwon; Lee, Younghee; Kwon, Hyung-Joo
Molecular immunology, 07/2011, Volume: 48, Issue: 12Journal Article
► Identification of immunostimulatory phosphodiester bond CT-ODN from Staphylococcus aureus DNA. ► The PO-CT-ODN induces cytokine production in a TLR9-dependent manner. ► The PO-CT-ODN can act as an adjuvant for the induction of Ag-driven IgG production. The innate immune system recognizes bacterial DNA as a nonself to induce rapid immune activation. TLR9 recognizes synthetic oligodeoxynucleotides (ODNs) and bacterial DNA containing unmethylated CpG dinucleotides in the context of specific base sequences (CpG-DNA). Here, we demonstrate that phosphorothioate backbone CT-ODN (PS-CT-ODN), a derivative of phosphorothioate backbone CpG-DNA (PS-ODN) with CT sequences substituted for the CG sequences, stimulates IL-8 promoter activation and gene expression. Furthermore, we identified an immunostimulatory phosphodiester bond CT-ODN (PO-CT-ODN) from Staphylococcus aureus chromosomal DNA and found that the PO-CT-ODN induces cytokine production in a TLR9-dependent manner when encapsulated with a proper liposome. Our experimental analyses also demonstrate that the immunostimulatory PO-CT-ODN can act as an adjuvant for the induction of Ag-driven IgG production. Further investigation of the functional role of PO-CT-ODN may support the future application of PO-CT-ODN in immunotherapeutics.
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