Synergistic H2O2 self-supplying and NIR-responsive drug delivery nanoplatform for chemodynamic-photothermal-chemotherapy.

Developing effectively synergistic multi-mode drug delivery nanoplatform for cancer treatment is of great significance but still challenging. Here, we construct core-shell (CaO2@Au nanoshells) nanoparticles coated with doxorubicin-loaded hyaluronic acid. The developed platform can be used as synergistic H2O2 self-supplying and near-infrared-enhanced reactive oxygen species producer for chemodynamic-photothermal-chemotherapy multi-mode drug delivery. In this platform, the CaO2 possesses a high capacity of self-supplying H2O2 in acidic conditions, while retains desired stability under physiological conditions. The in-situ deposited Au nanoshells not only provide a remarkable photothermal therapy, but function as peroxidase mimics to catalyze H2O2 to produce hydroxyl radical to afford highly efficient chemodynamic therapy. Furthermore, the outer layer hyaluronic acid can load doxorubicin and target overexpressed receptor CD44 of cancer cell, meanwhile, trigger release of DOX in photothermal condition and acidic tumor microenvironment. The results of in vitro cell viability and in vivo tumor inhibition indicate that the developed synergistic nanoplatform hold the potential as an efficient strategy for chemodynamic-photothermal-chemotherapy combination therapy of cancer.