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CpG-28 Oligodeoxynucleotide
Definition 1
A synthetic oligodeoxynucleotide containing multiple repeats of unmethylated CpG motifs (CpG ODN) with immunostimulatory activity. Upon entering the cell via endocytosis, CpG-28 activates numerous signaling transduction pathways resulting in the release of multiple cytokines. CpG-28 has immunomodulatory properties with direct activation of B-lymphocytes, dendritic and NK cells resulting in the stimulation of innate immunity and antibody-dependant cell cytotoxicity (ADCC). Additionally, this agent indirectly modulates T-cell responses though the release of cytokines (IL-12 and IFN gamma) to induce a preferential shift to the Th1 (helper) phenotype resulting in enhanced CD8+ cellular cytotoxicity. (NCI Thesaurus)
Definition 2
A synthetic oligodeoxynucleotide, containing unmethylated CpG motifs derived from bacterial DNA, with immunostimulatory activities. A CpG oligodeoxynucleotide (CpG ODN) binds to and activates a Toll-like receptor 9 (TLR9) and is taken up into cells by endocytosis; once internalized, it may activate numerous signaling transduction pathways resulting in the release of multiple cytokines. Through activation of TLR9, a CpG ODN can directly stimulate B-lymphocytes, dendritic and NK cells, resulting in an increase in innate immunity and antibody-dependant cell cytotoxicity (ADCC). Additionally, a CpG ODN can indirectly modulate T-cell responses, through the release of cytokines (IL-12 and IFN gamma), to induce a preferential shift to the Th1 (helper) phenotype resulting in enhanced CD8+ cellular cytotoxicity. (NCI Thesaurus)
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