Antioxidant and Prooxidant Nanozymes: From Cellular Redox Regulation to Next‐Generation Therapeutics

Nanozymes, nanomaterials with enzyme‐mimicking activity, have attracted tremendous interest in recent years owing to their ability to replace natural enzymes in various biomedical applications, such as biosensing, therapeutics, drug delivery, and bioimaging. In particular, the nanozymes capable of regulating the cellular redox status by mimicking the antioxidant enzymes in mammalian cells are of great therapeutic significance in oxidative‐stress‐mediated disorders. As the distinction of physiological oxidative stress (oxidative eustress) and pathological oxidative stress (oxidative distress) occurs at a fine borderline, it is a great challenge to design nanozymes that can differentially sense the two extremes in cells, tissues and organs and mediate appropriate redox chemical reactions. In this Review, we summarize the advances in the development of redox‐active nanozymes and their biomedical applications. We primarily highlight the therapeutic significance of the antioxidant and prooxidant nanozymes in various disease model systems, such as cancer, neurodegeneration, and cardiovascular diseases. The future perspectives of this emerging area of research and the challenges associated with the biomedical applications of nanozymes are described. This Review offers an overview of the recent development of redox‐active nanozymes, primarily highlighting antioxidant and prooxidant nanozymes and their therapeutic significance in oxidative‐stress‐mediated disorders with an outlook on the current challenges and future trends. The insight provided should aid the development of next‐generation therapeutic nanozymes for translation into clinical settings.