Synthetic oligonucleotides (ODN) expressing repetitive TTAGGG motifs patterned after hexameric sequences present at high frequency in mammalian teleomeres down-regulate the inflammatory immune responses elicited by a broad range of TLR ligands and the adaptive immune cell responses induced by polyclonal activators and antigens. These suppressive ODN are useful in the treatment of diseases characterized by over-exuberant immune responses, including septic shock and autoimmunity. Our recent studies demonstrate that suppressive ODN are also useful in the prevention/treatment of the life-threatening inflammation caused by silica inhalation (acute silicosis). Specifically, suppressive ODN treatment was shown to significantly reduce silica-induced mortality and morbidity in a relevant murine model. We are in the process of examining whether susceptibility to silica-induced pulmonary tumors can also be reduced by early Rx with suppressive ODN. Despite this progress, very little is known about the cellular targets of suppressive ODN, the receptors responsible for their recognition/uptake, or their mechanism of action. We are using microarray technology to identify the genes and regulatory networks that enable suppressive ODN to disrupt ongoing inflammatory responses and determine the duration of their immuno-inhibitory activity in vivo. With the insight gained from these studies, we plan to identify the receptor(s) responsible for the recognition of the TTAGGG motif key to this suppressive activity. Microarray studies indicate that very large numbers of genes are rapidly down-regulated following administration of suppressive ODN. We are in the process of studying the regulation of this generalized reduction in mRNA expresssion. Information gathered on the targets and mechanism(s) of action of suppressive ODN will support studies designed to explore their therapeutic utility. Recent results suggest that systemically administered suppressive ODN can alter the hosts immune milieu, an effect being harnessed to reduce host susceptibility to inflammation-induced cancers. Two lines of investigation have been initiated to achieve this goal. First, the effect of suppressive ODN in a murine model of chemically-induced skin cancer is being evaluated. Results from a series of experiments indicates that ODN significantly reudce the frequency and size of chemically induced papillomas. Moreover, initiation of therapy after papilloma formation reduces tumor size. Second, studies examining the effect of suppressive ODN in chronic silicosis, and the attendant development of lung cancer, have been initiated. It is hoped that the therapeutic utility of suppressive ODN identified through these research program can be harnessed to significantly reduce host susceptibility to tumor development and progression.

National Institute of Health (NIH)
National Cancer Institute (NCI)
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National Cancer Institute Division of Basic Sciences
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Steinhagen, Folkert; Zillinger, Thomas; Peukert, Konrad et al. (2018) Suppressive oligodeoxynucleotides containing TTAGGG motifs inhibit cGAS activation in human monocytes. Eur J Immunol 48:605-611
Scheiermann, Julia; Klinman, Dennis M (2016) Suppressive oligonucleotides inhibit inflammation in a murine model of mechanical ventilator induced lung injury. J Thorac Dis 8:2434-2443
Bayik, Defne; Gursel, Ihsan; Klinman, Dennis M (2016) Structure, mechanism and therapeutic utility of immunosuppressive oligonucleotides. Pharmacol Res 105:216-25
Klinman, Dennis M; Sato, Takashi; Shimosato, Takeshi (2016) Use of nanoparticles to deliver immunomodulatory oligonucleotides. Wiley Interdiscip Rev Nanomed Nanobiotechnol 8:631-7
Klinman, Dennis M (2015) Therapeutic implications of orally delivered immunomodulatory oligonucleotides. Mol Ther 23:222-3
Wandu, Wambui S; Tan, Cuiyan; Ogbeifun, Osato et al. (2015) Leucine-Rich Repeat Kinase 2 (Lrrk2) Deficiency Diminishes the Development of Experimental Autoimmune Uveitis (EAU) and the Adaptive Immune Response. PLoS One 10:e0128906
Zhao, Jing; Mou, Yongshan; Bernstock, Joshua D et al. (2015) Synthetic Oligodeoxynucleotides Containing Multiple Telemeric TTAGGG Motifs Suppress Inflammasome Activity in Macrophages Subjected to Oxygen and Glucose Deprivation and Reduce Ischemic Brain Injury in Stroke-Prone Spontaneously Hypertensive Rats. PLoS One 10:e0140772
Bode, Christian; Kinjo, Takeshi; Alvord, W Gregory et al. (2014) Suppressive oligodeoxynucleotides reduce lung cancer susceptibility in mice with silicosis. Carcinogenesis 35:1078-83
Shimada, Masaru; Yoshizaki, Shinji; Ichino, Motohide et al. (2014) Apoptosis of antigen-specific CTLs contributes to low immune response in gut-associated lymphoid tissue post vaccination. Vaccine 32:5198-205
Takahashi, Ryohei; Sato, Takashi; Klinman, Dennis M et al. (2013) Suppressive oligodeoxynucleotides synergistically enhance antiproliferative effects of anticancer drugs in A549 human lung cancer cells. Int J Oncol 42:429-36

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