A hybrid nanoadjuvant cascading activation of the cGAS-STING-IFN-Ⅰ pathway to enhance radio-immunotherapy. (PubMed, Biomaterials)
Arsenic trioxide (ATO)-mediated radiosensitization suppresses DDR, enhances immunogenic cell death, and increases tumor-associated antigens and cytosolic dsDNA levels...The synchronized delivery of Mn2+ and accumulated cytosolic dsDNA amplifies cGAS-STING activation, promoting dendritic cell (DC) maturation, enhancing CD8+ T cell infiltration, reducing immunosuppressive Treg infiltration, and significantly inhibiting both irradiated local tumors and non-irradiated distal CRC tumors while inducing robust immune memory effects, all with no notable toxicity. This study demonstrates that effective RT sensitization, coupled with synchronized STING activation, represents a robust strategy to overcome radio-immunotherapy resistance in colorectal cancer.