Engineering an Adhesive based on Photosensitive Polymer Hydrogel and Silver Nanoparticles for Wound Healing
Hemostasis, wound closure and prevention of infection are critical to wound healing after an injury. Skin adhesives have been used to seal incisions, thus aiding primary wound healing, as well as creating a barrier to microbes. We constructed a skin adhesive with antibacterial and hemostatic activities (AHAs) for wound management. The adhesive was made by using methacrylated hyaluronan-polyacrylamide (MHA-PAAm) hydrogel, integrated with silver nanoparticles (AgNPs) and bonded to gelatin. Because of the three-dimensional network structure of hydrogel, nanoscale particles can be encapsulated into their voids; the AgNPs, through sustained delivery of silver ions, endow the adhesive with sustained broad-spectrum antibacterial activity. Furthermore, due to the introduction of MHA which can be crosslinked by visible light, the polyacrylamide hydrogel matrix can be formed through photo crosslink. In addition, the gelatin can be bonded to both the hydrogel matrix and host tissue because of the interaction between carboxyl and amino-moieties. Our animal studies demonstrated that the AHAs which possess tissue adhesive and antibacterial properties were easy to stretch, and were able to stop bleeding in rat tail amputation and liver injury models. AHAs enhance wound granulation tissue formation, vascular tissue, and collagen formation, as well as alleviate inflammation. These properties promoted wound closure in rat wound infection models, promising great potential of applying AHAs in clinical uses.