Adhesion Prevention after Laminectomy Using Silk‐Polyethylene Glycol Hydrogels. Issue 14 (24th August 2015)

• Record Type: Journal Article
• Authors: Wang, Yansong; Liang, Min; Zheng, Zhaozhu; Shi, Liangchen; Su, Bo; Liu, Jian; Kaplan, David L.; Zhang, Bin; Wang, Xiaoqin
• Is Part Of: Advanced healthcare materials. Volume 4:Issue 14(2015)
• Page Start: 2120
• Page End: 2127
• Publication Date: 2015-08-24
• Subjects: epidural adhesion -- laminectomy -- silk‐PEG hydrogel; Biomedical materials -- Periodicals; 610.28
• DOI: 10.1002/adhm.201500392
• Languages: English
• ISSNs: 2192-2640

Abstract

Abstract : Laminectomy is a common operation in spine surgery to reduce spinal cord and nerve pressure. However, scar tissues often form in the spinal canal and adhere to the dura surface, resulting in low back pain postsurgery. In the present study, biodegradable silk‐polyethylene glycol (PEG) hydrogels are evaluated for adhesion prevention after laminectomies in New Zealand rabbits, with nondegradable expanded polytetrafluoroethylene (ePTFE) membranes and saline as controls. No significant difference among the three groups is observed within 2 weeks. Silk is fully degraded within 6 weeks, leaving a gap separating the scar tissue and the dura mater. Severe dural scar adhesion form in the saline control group after 8 weeks, while no or mild adhesion is observed in the ePTFE membrane and silk‐PEG hydrogel samples. Human dermal fibroblasts (HS‐865‐SK cells) are cultured in the silk‐PEG hydrogel extracts and on top of gel surfaces. Compared to the controls of tissue culture plate (no silk) and sonicated silk hydrogels (no PEG), the proliferation of fibroblasts in both conditions is significantly reduced initially but resumes after 120 h, suggesting the surface properties of the hydrogels and local, temporal release of PEG accounts for the adhesion prevention observed in vivo in this study. Abstract : Injectable hydrogel composed of silk fibroin protein and polyvinyl alcohol (PEG) 400 can effectively inhibit scar tissue formation for more than 4 weeks after laminectomy in spine surgery, thus preventing tissue adhesion to dura surface, likely due to slow biodegradation of silk within 6 weeks and local release of PEG from hydrogel.