Preparation of healing-promoting and fibrosis-inhibiting asymmetric poly(ethylene glycol-b-L-phenylalanine)/cRGD-modified hyaluronate sponges and their applications in hemorrhage and nasal mucosa repair.

Acute or chromic bleeding, such as epistaxis, requires hemostatic materials to assist hemostasis. Even in complex cases, hemostatic materials must have other functions, including the promotion of healing and prevention of adhesion. Herein, a series of fibrosis-suppressive functional cRGD-modified crosslinking hyaluronic acid sponges were prepared. The in vitro hemostatic efficiency and mechanism were determined using blood clotting time, blood coagulation index, lactate dehydrogenase (LDH) and thromboxane B2 (TX-B2) ELISA, and proteomics. Among the prepared sponges, both poly(ethylene-b-L-Phe) (PEBP)-and cRGD contained SPN4 and exhibited the highest platelet concentration and activation efficiency as well as the most effective coagulative effect. In addition, no significant cytotoxicity was observed for the sponges in rat airway epithelial cells. The in vivo hemostatic and adhesion-preventive effects of the sponges were evaluated using rat models of liver injury and sidewall defect-cecum abrasion. PEBP-containing sponges effectively prevented postoperative adhesion and cRGD-modified sponges exhibited excellent hemostatic effects. Finally, the comprehensive repair effects of the sponges were evaluated using a rabbit maxillary sinus mucosal injury model, based on CT, MRI examination, and pathological staining. SPN4 exhibited the best comprehensive reparative effects, including the promotion of mucosal repair and infection inhibition. Thus, SPN4 is a promising multifunctional hemostatic material.