The
therapeutic effect of traditional chemodynamic
therapy (CDT) agents is severely restricted by their weakly acidic pH and
glutathione (GSH) overexpression in the tumor microenvironment. Here, fusiform-like
copper(II)-based tetrakis(4-carboxy phenyl)porphyrin (
TCPP) nanoscale
metal-organic frameworks (nMOFs) were designed and constructed for the first time (named
PCN-224(Cu)-GOD@MnO2). The coated MnO2 layer can not only avoid conjugation of
glucose oxidase (GOD) to damage normal cells but also catalyzes the generation of O2 from H2O2 to enhance the oxidation of
glucose (Glu) by GOD, which also provides abundant H2O2 for the subsequent Cu+-based Fenton-like reaction. Meanwhile, the Cu2+ chelated to the
TCPP ligand is converted to Cu+ by the excess GSH in the
tumor, which reduces the
tumor antioxidant activity to improve the CDT effect. Next, the Cu+ reacts with the plentiful H2O2 by
enzyme catalysis to produce a toxic
hydroxyl radical (•OH), and
singlet oxygen (1O2) is synchronously generated from combination with Cu+, O2, and H2O via the Russell mechanism. Furthermore, the nanoplatform can be used for both
TCPP-based in vivo fluorescence imaging and Mn2+-induced T1-weighted magnetic resonance imaging. In conclusion, fusiform-like
PCN-224(Cu)-GOD@MnO2 nMOFs facilitate the therapeutic efficiency of chemodynamic and
starvation therapy via combination with relief
hypoxia and GSH depletion after acting as an accurate imaging guide.