Ternary Alloy PtWMn as a Mn Nanoreservoir for High‐Field MRI Monitoring and Highly Selective Ferroptosis Therapy

Ferroptosis exhibits potential to damage drug-resistant cancer cells. However, it is still restricted with the "off-target" toxicity from the undesirable leakage of metal ions from ferroptosis agents, and the lack of reliable imaging for monitoring the ferroptosis process in living systems. Herein, we develop a novel ternary alloy PtWMn nanocube as a Mn reservoir, and further design a microenvironment-triggered nanoplatform that can accurately release Mn ions within the tumor to increase reactive oxygen species (ROS) generation, produce O₂ and consume excess glutathione for synergistically enhancing nonferrous ferroptosis. Moreover, this nanoplatform exerts a responsive signal in high-field magnetic resonance imaging (MRI), which enables the real-time report of Mn release and the monitoring of ferroptosis initiation through the signal changes of T₁ -/T₂ -MRI. Thus, our nanoplatform provides a novel strategy to store, deliver and precisely release Mn ions for MRI-guided high-specificity ferroptosis therapy.