中国神经再生研究(英文版) ›› 2020, Vol. 15 ›› Issue (9): 1724-1731.doi: 10.4103/1673-5374.276361

• 原著:周围神经损伤修复保护与再生 • 上一篇    下一篇

用于动态压迫腰神经根的双网络水凝胶

  

  • 出版日期:2020-09-08 发布日期:2020-09-23
  • 基金资助:


A double-network hydrogel for the dynamic compression of the lumbar nerve root

Hui Li1, #, Hua Meng1, #, Yan-Yu Yang2, 3, Jia-Xi Huang1 , Yong-Jie Chen1 , Fei Yang2, * , Jia-Zhi Yan1, *   

  1. 1 Department of Orthopedic Surgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China 2 Institute of Chemistry, Chinese Academy of Science, Beijing, China 3 Zhengzhou University, Zhengzhou, Henan Province, China
  • Online:2020-09-08 Published:2020-09-23
  • Contact: Jia-Zhi Yan, PhD, beijingtiantan@163.com; Fei Yang, fyang@iccas.ac.cn.
  • Supported by:
    This work was supported by the High Levels of Health Technical Personnel in Beijing Health System of China, No. 2013-3-050 (to
    JZY).

摘要: orcid:  0000-0001-7404-4688 (Jia-Zhi Yan)

Abstract: Current animal models of nerve root compression due to lumbar disc herniation only assess the mechanical compression of nerve roots and the inflammatory response. Moreover, the pressure applied in these models is static, meaning that the nerve root cannot be dynamically compressed. This is very different from the pathogenesis of lumbar disc herniation. In this study, a chitosan/polyacrylamide double-network hydrogel was prepared by a simple two-step method. The swelling ratio of the double-network hydrogel increased with prolonged time, reaching 140. The compressive strength and compressive modulus of the hydrogel reached 53.6 and 0.34 MPa, respectively. Scanning electron microscopy revealed the hydrogel’s crosslinked structure with many interconnecting pores. An MTT assay demonstrated that the number of viable cells in contact with the hydrogel extracts did not significantly change relative to the control surface. Thus, the hydrogel had good biocompatibility. Finally, the double-network hydrogel was used to compress the L4 nerve root of male sand rats to simulate lumbar disc herniation nerve root compression. The hydrogel remained in its original position after compression, and swelled with increasing time. Edema appeared around the nerve root and disappeared 3 weeks after operation. This chitosan/polyacrylamide double-network hydrogel has potential as a new implant material for animal models of lumbar nerve root compression. All animal experiments were approved by the Animal Ethics Committee of Neurosurgical Institute of Beijing, Capital Medical University, China (approval No. 201601006) on July 29, 2016.

Key words: chitosan, double-network hydrogel, dynamic compression, lumbar disc herniation, micro-MRI, nerve root, peripheral neuropathic pain, polyacrylamide