Engineered gold/black phosphorus nanoplatforms with remodeling tumor microenvironment for sonoactivated catalytic tumor theranostics

The imbalance between oxidants and antioxidants in cancer cells would evoke oxidative stress-induced cell death,which has been demonstrated to be highly effective in treating malignant tumors.Sonodynamic therapy(SDT)adopts ultrasound(US)as the excitation source to induce the production of reactive oxygen species(ROS),which emerges as a noninvasive therapeutic strategy with deep tissue penetration depth and high clinical safety.Herein,we construct novel sonoactivated oxidative stress amplification nanoplatforms by coating MnO_(2) on Au nanoparticle-anchored black phosphorus nanosheets and decorating soybean phospholipid subsequently(Au/BP@MS).The Au/BP@MS exhibit increased ROS generation efficiency under US irradiation in tumor tissues due to Au/BP nanosensitizer-induced improvement of electron-hole separation as well as MnO_(2)-mediated O_(2) generation and GSH depletion,thus leading to notable inhibition effect on tumor growth.Moreover,tumor microenvironment-responsive biodegradability of Au/BP@MS endows them with enhanced magnetic resonance imaging guidance and clinical potential for cancer theranostics.