Microbiota-derived secondary bile acids promote STING activation and antitumor activity

Abstract

Microbiota metabolism generates diverse bile acids that are associated with health and disease, but the molecular targets and mechanisms of action for these metabolites have not been fully elucidated. Using deoxycholic acid (DCA) photoaffinity probes, with cholic acid (CA) probe as a comparator, we found many protein targets of microbiota-derived DCA in mammalian cells. Of note, we discovered that DCA binds the transmembrane domain of stimulator of interferon genes (STING), and enhances agonist-induced accumulation of higher-order STING species, type I interferon signaling and antitumor immunity. Moreover, DCA-producing microbiota species enhanced STING agonist-induced antitumor immunity primarily through the activation of natural killer (NK) cells. This reverse chemical microbiology approach revealed an unpredicted mechanism of action for DCA on STING activation and suggests that specific secondary bile acids and their associated microbiota species may promote NK activation and impact the efficacy of STING-targeted therapeutics.