GHK-Cu hydrogel with GOX creates cascade catalysis for diabetic wound glucose regulation and hypoxia reversal

Chronic diabetic wounds present significant challenges due to persistent hyperglycemia, which fuels microbial growth and impairs healing, alongside severe hypoxia that compromises cellular function. Traditional 'starvation therapy' aims to deplete microbial nutrients by regulating glucose but often exacerbates local oxygen depletion, limiting its efficacy. There's a critical need for synergistic approaches that can simultaneously manage glucose levels, reverse hypoxia, and promote tissue regeneration in these complex, refractory wounds.

Researchers engineered a Gel@GHK-Cu/GOX hydrogel system designed for cascade catalysis. This involved incorporating the copper peptide GHK-Cu into a hydrogel loaded with glucose oxidase (GOX). The GOX component initiates glucose oxidation, which reduces local glucose levels and generates hydrogen peroxide (H2O2). Subsequently, copper ions from GHK-Cu activate a catalase-like reaction, mediating H2O2 decomposition to release oxygen, thereby alleviating hypoxia. The study investigated the hydrogel's ability to facilitate this cascade and its broader therapeutic effects.

The Gel@GHK-Cu/GOX hydrogel successfully facilitated the decomposition of glucose into oxygen via its designed cascade reaction. This dual action effectively reduced local hyperglycemia and concurrently alleviated wound hypoxia by generating oxygen.

The hydrogel demonstrated multiple therapeutic benefits, including potent antibacterial activity, significant promotion of tissue repair, enhanced antioxidant capacity, and robust stimulation of angiogenesis. These findings confirm the hydrogel's multifunctional synergistic mechanism, offering a novel strategy for chronic diabetic wound therapy. The abstract did not provide specific quantitative data such as percentages, p-values, or fold-changes for these observed effects.