STING promotes homeostasis via regulation of cell proliferation and chromosomal stability

Given the integral role of Stimulator of interferon genes (STING, TMEM173) in the innate immune response, its loss or impairment in cancer is thought to primarily affect antitumor immunity. Here we demonstrate a role for STING in the maintenance of cellular homeostasis through regulation of the cell cycle. Depletion of STING in human and murine cancer cells and tumors resulted in increased proliferation compared to wild-type controls. Microarray analysis revealed genes involved in cell cycle regulation are differentially expressed in STINGko compared to WT MEFs. STING-mediated regulation of the cell cycle converged on NF-κB- and p53-driven activation of p21. The absence of STING led to premature activation of cyclin-dependent kinase 1 (CDK1), early onset S phase and mitosis, and increased chromosome instability, which was enhanced by ionizing radiation (IR). These results suggest a pivotal role for STING in maintaining cellular homeostasis and response to genotoxic stress.

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