Acid-degradable nanocomposite hydrogel and glucose oxidase combination for killing bacterial with photothermal augmented chemodynamic therapy

Bacterial infection often delays diabetic wound healing, and even causes serious life-threatening complications. Herein, we successfully developed a Cu 2 O/Pt nanocubes-dopping alginate (ALG)- hyaluronic acid (HA) hydrogel (Cu 2 O/Pt hydrogel) by simple assembly of the Cu 2 O/Pt nanocubes and the ALG-HA mixture. The Cu 2 O/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 H 2 O 2 for starvation therapy, following which the released Cu 2 O/Pt nanocubes react with H 2 O 2 in the acidic microenvironment to generate highly cytotoxic hydroxyl radicals (·OH) for CDT. Additionally, the Cu 2 O/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 Cu 2 O/Pt hydrogel combined with GOx may be a potential therapeutic approach for treating the infected diabetic wound.