Photocurable fisetin silk fibroin hydrogel accelerates infected diabetic wounds healing through biofilm inhibition and macrophage immunomodulation

Infected diabetic wounds (IDW) are difficult to heal and lead to serious complications such as amputation. Inspired by natural elements, we developed an injectable photocurable hydrogel platform based on methacrylamide silk fibroin, encapsulated with ZnO NPs and plants derived fisetin, for accelerating IDW healing. The combined release of ZnO NPs and fisetin inhibited the biofilm formation of Staphylococcus aureus on the wound surface, while fisetin possessed the immunomodulatory function of promoting macrophage M2 polarization and the release of anti-inflammatory cytokines to promote tissue healing. Therefore, this natural hydrogel composite platform can be applied as a potential wound dressing with good biocompatibility.