Mg-gallate metal-organic framework-based sprayable hydrogel for continuously regulating oxidative stress microenvironment and promoting neurovascular network reconstruction in diabetic wounds

Chronic diabetic wounds are the most common complication for diabetic patients.Due to high oxidative stress levels affecting the entire healing process,treating diabetic wounds remains a challenge.Here,we present a strategy for continuously regulating oxidative stress microenvironment by the catalyst-like magnesium-gallate metal-organic framework(Mg-GA MOF)and developing sprayable hydrogel dressing with sodium alginate/chitosan quaternary ammonium salts to treat diabetic wounds.Chitosan quaternary ammonium salts with antibacterial properties can prevent bacterial infection.The continuous release of gallic acid(GA)effectively eliminates reactive oxygen species(ROS),reduces oxidative stress,and accelerates the polarization of M1-type macrophages to M2-type,shortening the transition between inflammation and proliferative phase and maintaining redox balance.Besides,magnesium ions adjuvant therapy promotes vascular regeneration and neuronal formation by activating the expression of vascular-associated genes.Sprayable hydrogel dressings with antibacterial,antioxidant,and inflammatory regulation rapidly repair diabetic wounds by promoting neurovascular network reconstruction and accelerating re-epithelialization and collagen deposition.This study confirms the feasibility of catalyst-like MOF-contained sprayable hydrogel to regulate the microenvironment continuously and provides guidance for developing the next generation of non-drug diabetes dressings.