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Lactic acid (LA) plays a major role in the occurrence, development, and spread of cancer. Enlightened by its high accumulation in tumor site, a novel lactate oxidase (LOD) conjugated two-dimensional Pd@Ir nanoplatform (Pd@Ir-LOD, PIL) was fabricated to combine cascade reaction with photothermal for tumor therapy. In detail, the overexpressed LA in tumor microenvironment (TME) was a key factor to activate the PIL-based cascade reaction: (1) Plenty of H2O2 could be generated from LA by the catalysis of LOD with O2; (2) potent ·OH was produced from H2O2 due to the peroxidase (POD)-like activity of PIL; (3) meantime, PIL’s catalase (CAT)-like activity could decompose part H2O2 into O2 to achieve the purpose of LA cyclic oxidization. Moreover, the reduced glutathione (GSH) scavenging capability of PIL might protect the produced reactive oxygen species (ROS) from being cleared to further improve the cascade therapeutic effect. More importantly, PIL had excellent photothermal conversion efficiency (37.35%) and manifested a surprising temperature rising effect in tumor. Taken together, the decreasing LA concentration, accumulation of high-toxic ROS, the depletion of GSH together with the higher intra-tumoral temperature potently enhanced in vivo antitumor therapy. Therefore, a promising therapeutic tactic based on PIL integrating endogenous LA consumption, chemodynamic therapy (CDT), and photothermal therapy (PTT) has been put forward.
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