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Volume 2 Supplement 3

Abstracts of the 29th Annual Scientific Meeting of the Society for Immunotherapy of Cancer (SITC)

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Cyclic dinucleotides (CDNs) anti-tumors response by activating DC and NK cell crosstalk

Intracellular bacterial, Listeria monocytogenes generates cyclic diadenosine monophosphate (c-di-AMP) can active interferon regulatory factor3 (IRF3) and nuclear factor kappa-light-chain-enhancer (NF-κB) and induces B cell and macrophage secretion of IFN-β [1]. Cyclic diguanylic acid (c-di-GMP) also acts as an important signaling molecule in a variety of bacterial species infection functions. IFN-β actives NK cells through Tyk2-STAT1 signal pathway. Our studied showed CDNs anti-tumor effective dependent IFNα/β receptors (IFNAR1/IFNAR2) on the cell plasma membrane. Some study showed c-di-GMP significantly inhibited the proliferation of human colon cancer cells in vitro [2]. Cyclic dinucleotides (CDNs, c-di-AMP and c-di-GMP) are sensed by STING (stimulator of interferon genes). But CDNs were developed for prevent and therapeutic cancers, it was a novel method. We combined GM-CSF-producing tumor vaccine and TLR agonists enhanced systemic anti-tumor immunity. Our studied showed the regimen significantly inhibition mice tumors growth in B16 melanoma and colon cancer in vivo.


  1. Woodard Joshua, Iavarone Anthony T, Portnoy Daniel A: Science, Vol 328, 25 June, 2010. C-di-AMP secreted by intracellular Listeria monocytogenes activates a host type I interferon response.

  2. Steinberger O, Lapidot Z, Ben-Ishai Z, Amikam D: Elevated expression of the CD4 receptor and cell cycle arrest are induced in Jurkat cells by treatment with the novel cyclic dinucleotide 3', 5'-cyclic diguanylic acid. FEBS Lett. 444 (1999): 125-129.

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Fu, J., Pardoll, D. & Kim, Y.J. Cyclic dinucleotides (CDNs) anti-tumors response by activating DC and NK cell crosstalk. j. immunotherapy cancer 2 (Suppl 3), P169 (2014).

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