Study on an Injectable Chitosan–Lignin/Poloxamer Hydrogel Loaded with Platelet-Rich Plasma for Intrauterine Adhesion Treatment

It is a great challenge to obtain an ideal hydrogel for the clinical treatment of intrauterine adhesion (IUA) disease. Here, a novel injectable chitosan-lignin/poloxamer hydrogel loaded with platelet-rich plasma (CL-PF127@PRP) was prepared by self-assembly at room temperature. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), rheological analysis, and injectable writing were used to characterize the structure of the hydrogel. The results confirmed that the amino group of chitosan and the sulfonic group of sodium lignosulfonate were ionic-crosslinked by electrostatic attraction, which stabilized the three-dimensional structure of the PF127 hydrogel loaded with PRP, and PRP made the porous structure gradually become tight. Moreover, the CL-PF127@PRP hydrogel displayed good injectability and a solid state. The soaking experiment showed that the CL-PF127@PRP hydrogel had suitable degradation at pH = 7 and a good PRP release rate (PRP release 70% at 96 h). Cell experiments in vitro demonstrated that the CL-PF127@PRP hydrogel possessed good biocompatibility, an anti-inflammatory function, and pro-angiogenic activity. Furthermore, an animal experiment of skin wound and IUA confirmed that the skin wound closure rate of the CL-PF127@PRP hydrogel was over 50% on the seventh day. PRP improved the thickness of the endometrium and uterus receptivity, suggesting that the CL-PF127@PRP hydrogel offers great promise for the clinical treatment of IUA.