Microenvironment-feedback regulated hydrogels as living wound healing materials.

Physiological microenvironments present a time-dependent variation during pathogenic or therapeutic processes, which call for life-like biomaterials of dynamic adaptation. However, current prevailed biomaterials maintain a passively responsive mode and lack autonomous and interactive dynamics. Striving for a paradigm of microenvironment interactive and self-regulatory medical agents as next-generation of biomaterials is of desperate need. Herein, we develop a microenvironment-feedback hydrogel as a living dressing biomaterial catering diabetic chronic wounds. This dynamic hydrogel leverages the initial alkaline pH of the wound bed as fuel and employs biocatalytic acid generation as the anti-fuel. By coupling this feedback loop to pH-regulated imine crosslinks, the hydrogel facilitates adaptive sol-gel cycling with programmable glucose oxidase (GOx) release in a Type-I diabetic mouse model. Thus, homeostatic wound pH and blood glucose levels are achieved, favoring accelerated in vivo wound healing and tissue repair.