A Single‐Atom Manganese Nanozyme Mn‐N/C Promotes Anti‐Tumor Immune Response via Eliciting Type I Interferon Signaling
Wen Qiao, Jingqi Chen, Huayuan Zhou, Cegui Hu, Sumiya Dalangood, Hanjun Li, Dandan Yang, Yu Yang, Jun Gui
Abstract
Abstract Tumor microenvironment (TME)‐induced nanocatalytic therapy is a promising strategy for cancer treatment, but the low catalytic efficiency limits its therapeutic efficacy. Single‐atom catalysts (SACs) are a new type of nanozyme with incredible catalytic efficiency. Here, a single‐atom manganese (Mn)‐N/C nanozyme is constructed. Mn‐N/C catalyzes the conversion of cellular H 2 O 2 to ∙OH through a Fenton‐like reaction and enables the sufficient generation of reactive oxygen species (ROS), which induces immunogenic cell death (ICD) of tumor cells and significantly promotes CD8 + T anti‐tumor immunity. Moreover, RNA sequencing analysis reveals that Mn‐N/C treatment activates type I interferon (IFN) signaling, which is critical for Mn‐N/C‐mediated anti‐tumor immune response. Mechanistically, the release of cytosolic DNA and Mn 2+ triggered by Mn‐N/C collectively activates the cGAS‐STING pathway, subsequently stimulating type I IFN induction. A highly efficient single‐atom nanozyme, Mn‐N/C, which enhances anti‐tumor immune response and exhibits synergistic therapeutic effects when combined with the anti‐PD‐L1 blockade, is proposed.