ATP-Activated Self-Cascade Nanoplatform for ROS/mPTT/Starvation Tri-Therapy through Tumor Microenvironment Remodeling
Iron-gallic acid chelate nanoparticles (Fe-GA NPs) have emerged as promising Fenton catalysts and drug carriers in oncology. However, their therapeutic efficacy remains constrained by tumor microenvironment (TME) limitations-- suboptimal pH and insufficient endogenous hydrogen peroxide. To overcome these barriers, we engineered an ATP-responsive core-shell nanoarchitecture (GOx@Fe-GA) integrating glucose oxidase (GOx) with Fe-GA coordination networks. Upon encountering elevated ATP concentrations in tumor cells, the nanosystem undergoes programmed disassembly: released GOx depletes glucose to induce metabolic starvation while generating substantial H2O2 and acidifying the TME, thereby creating ideal conditions for Fe-GA-mediated Fenton reactions. Simultaneously, Fe-GA acts as a photothermal agent under near-infrared irradiation, achieving mild hyperthermia that synergizes with reactive oxygen species (ROS) to overcome thermotolerance by disrupting heat shock protein (HSP70) defenses. In vitro and in vivo studies demonstrated potent tumor suppression with minimal systemic toxicity, establishing GOx@Fe-GA as a self-enhancing therapeutic platform where tumor-specific ATP triggers cascading therapeutic amplification through ROS storm, metabolic deprivation, and photothermal sensitization.
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