Multifunctional PtCuTe Nanosheets with Strong Ros Scavenging And ROS-independent Antibacterial Properties Promote Diabetic Wound Healing.

Nanozymes, as one of the most efficient reactive oxygen species (ROS)-scavenging biomaterials, are receiving wide attention in promoting diabetic wound healing. Despite recent attempts at improving the catalytic efficiency of Pt-based nanozymes, (e.g., PtCu, one of the best systems), they still display quite limited ROS scavenging capacity and ROS-dependent antibacterial effects on bacteria or immunocytes, which leads to uncontrolled and poor diabetic wound healing. Hence, we report a new class of multifunctional PtCuTe nanosheets with excellent catalytic, ROS-independent antibacterial, pro-angiogenic, anti-inflammatory and immuno-modulatory properties for boosting the diabetic wound healing. We demonstrate that the PtCuTe nanosheets show stronger ROS scavenging capacity and better antibacterial effects than PtCu. We also revealed that the PtCuTe can enhance vascular tube formation, stimulate macrophage polarization towards the M2 phenotype and improve fibroblast mobility, outperforming conventional PtCu. Moreover, PtCuTe promotes crosstalk between different cell types to form a positive feedback loop. Consequently, PtCuTe stimulated a pro-regenerative environment with relevant cell populations to ensure normal tissue repair. Utilizing a diabetic mouse model, we demonstrated that PtCuTe significantly facilitated the regeneration of highly vascularized skin, with the percentage of wound closure being over 90% on the 8 th day, which is the best among the reported comparable multifunctional biomaterials. This article is protected by copyright. All rights reserved.