Acid-degradable nanocomposite hydrogel and glucose oxidase combination for killing bacterial with photothermal...

Bacterial infection often delays diabetic wound healing, and even causes serious life-threatening complications. Herein, we successfully developed a Cu₂O/Pt nanocubes-dopping alginate (ALG)- hyaluronic acid (HA) hydrogel (Cu₂O/Pt hydrogel) by simple assembly of the Cu₂O/Pt nanocubes and the ALG-HA mixture. The Cu₂O/Pt hydrogel combined with the glucose oxidase (GOx) can be used for photothermal- and starving-enhanced chemodynamic therapy (CDT) against Gram-negative and Gram-positive bacteria. The GOx can catalyze the glucose to produce gluconic acid and H₂O₂ for starvation therapy, following which the released Cu₂O/Pt nanocubes react with H₂O₂ in the acidic microenvironment to generate highly cytotoxic hydroxyl radicals (·OH) for CDT. Additionally, the Cu₂O/Pt hydrogel can release copper ions gradually with the decrease of pH induced by gluconic acid, which can increase the protein expression and secretion of vascular endothelial growth factor (VEGF) and promote endothelial cell proliferation, migration and angiogenesis, subsequently promoting diabetic wound healing in rats. Our results suggested that the Cu₂O/Pt hydrogel combined with GOx may be a potential therapeutic approach for treating the infected diabetic wound.