A Tumor‐Microenvironment‐Activated Nanozyme‐Mediated Theranostic Nanoreactor for Imaging‐Guided Combined Tumor Therapy

Activatable theranostic agents that can be activated by tumor microenvironment possess higher specificity and sensitivity. Here, activatable nanozyme‐mediated 2,2′‐azino‐bis (3‐ethylbenzothiazoline‐6‐sulfonic acid) (ABTS) loaded ABTS@MIL‐100/poly(vinylpyrrolidine) (AMP) nanoreactors (NRs) are developed for imaging‐guided combined tumor therapy. The as‐constructed AMP NRs can be specifically activated by the tumor microenvironment through a nanozyme‐mediated “two‐step rocket‐launching‐like” process to turn on its photoacoustic imaging signal and photothermal therapy (PTT) function. In addition, simultaneously producing hydroxyl radicals in response to the high H2O2 level of the tumor microenvironment and disrupting intracellular glutathione (GSH) endows the AMP NRs with the ability of enhanced chemodynamic therapy (ECDT), thereby leading to more efficient therapeutic outcome in combination with tumor‐triggered PTT. More importantly, the H2O2‐activated and acid‐enhanced properties enable the AMP NRs to be specific to tumors, leaving the normal tissues unharmed. These remarkable features of AMP NRs may open a new avenue to explore nanozyme‐involved nanoreactors for intelligent, accurate, and noninvasive cancer theranostics.

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