A Sonication‐Activated Valence‐Variable Sono‐Sensitizer/Catalyst for Autography Inhibition/Ferroptosis‐Induced Tumor Nanotherapy

Abstract The effective deployment of reactive oxygen species (ROS)‐mediated oncotherapy in practice remains challenging, mired by uncontrollable catalytic processes, stern reaction conditions and safety concerns. Herein, we develop a copper nanodot integrating sonodynamic and catalytic effects within one active center, which responds to exogenous ultrasound (US) and endogenous H 2 O 2 stimuli. US irradiation induces the valence conversion from Cu II to Cu I catalyzing H 2 O 2 into ⋅OH for chemodynamic therapy. Meanwhile, valence transformation results in electron‐hole pairs separation, promoting ROS generation for sonodynamic therapy. Notably, copper nanodots not only block lysosome fusion and degradation leading to autophagy flux blockage, but also interfere with the glutathione peroxidase 4 and cystine‐glutamate antiporter SLC7A11 function achieving ferroptosis. Furthermore, reversible valence changes, inherent hydrophilicity and renal clearance ultrasmall size guarantee biosafety.