Precision therapy through breaking the intracellular redox balance with an MOF-based hydrogel intelligent nanobot for enhancing ferroptosis and activating immunotherapy

Abstract

) into highly toxic hydroxyl radicals (˙OH), but also effectively consume GSH to attenuate the intracellular oxidative stress. The negative charge of the FSMH nanohydrogel system guarantees its superexcellent stabilization in blood circulation and optimal tumor collection. Subsequently, the surface charge of the endocytosed FSMH was transformed to a positive charge after exposure to the acidic tumor environment, further improving its tumor collection and locally releasing Fe ions and immune adjuvants. Furthermore, Ce6 was released in a pH-responsive manner in the acidic microenvironment. In the presence of near-infrared light, singlet oxygen was produced by the FSMH nanohydrogel system, to ablate tumors and promote the maturation of dendritic cells, achieving the precision-combined strategies effect of CDT, PDT, and immunotherapy.