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Engineered Biomimetic Copper Sulfide Nanozyme Mediates "Don't Eat Me" Signaling for Photothermal and Chemodynamic Precision Therapies of Breast Cancer.
ACS Applied Materials & Interfaces 2023 May 10
The rapid development of nanomedicine has brought hope and confidence to the precise treatment of tumors. However, the efficacy of nanoparticle-mediated therapy is severely limited due to phagocytosis and clearance by macrophages. CD47 is a well-documented ″don't eat me″ signaling molecule that binds to the SIRPα receptor on the macrophage surface, inhibiting the phagocytic behavior of the macrophages. In this study, CD47-overexpressing cancer cell membranes were used to coat hollow copper sulfide nanoparticles. The nanoparticles were shown to have an extended circulatory half-life and to actively target breast cancer, leading to increased accumulation in the tumor tissue. An excellent photothermal therapeutic effect was produced by near-infrared laser irradiation. At the same time, β-lapachone within the nanoparticles generated large amounts of hydrogen peroxide in the tumor environment, which was then catalyzed by the copper sulfide nanozyme to cytotoxic hydroxyl radicals, exerting a chemodynamic therapeutic effect. This engineered biomimetic nanozyme, through the mediation of the ″don't eat me″ signal, achieved both photothermal and chemodynamic precision treatments of breast cancer, creating a new mode of safe and effective tumor treatment.
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