中国神经再生研究(英文版) ›› 2015, Vol. 10 ›› Issue (9): 1491-1497.doi: 10.4103/1673-5374.165522

• 原著:周围神经损伤修复保护与再生 • 上一篇    下一篇

含3种营养因子的聚乳酸-羟基乙酸复合微球可促进损伤坐骨神经修复

  

  • 收稿日期:2015-06-07 出版日期:2015-09-28 发布日期:2015-09-28
  • 基金资助:

    湖南省自然科学基金(13JJ6016)

Polylactic-co-glycolic acid microspheres containing three neurotrophic factors promote sciatic nerve repair after injury

Qun Zhao1, Zhi-yue Li2, Ze-peng Zhang2, Zhou-yun Mo3, Shi-jie Chen2, Si-yu Xiang2, Qing-shan Zhang2, Min Xue4   

  1. 1 Health Management Center, Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China 
    2 Department of Orthopedics, Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
    3 Department of Orthopedics, Yiyang Municipal Central Hospital, Yiyang, Hunan Province, China
    4 Department of Gynecology , Third Xiangya Hospital of Central South University, Changsha, Hunan Province, China
  • Received:2015-06-07 Online:2015-09-28 Published:2015-09-28
  • Contact: Min Xue, Ph.D., xuemin5908@sina.com.
  • Supported by:

    This study was financially supported by a grant from the Natural Science Foundation of Hunan Province of China, No. 13JJ6016.

摘要:

多种神经营养因子修复损伤周围神经的作用已得到诸多研究的证实,但在实践应用中,神经生长因子、神经营养素3和脑源性神经营养因子均为多肽或蛋白质,在损伤局部很快失活,单次用药维持局部有效浓度时间常不能满足脊髓轴突再生穿越胶质瘢痕区所需的时间。为解决这一问题,实验以聚乳酸-羟基乙酸共聚物做为微球系统囊壁材料,制造含神经生长因子、神经营养素3、脑源性神经营养因子直径约300μm的高分子缓释微球,在坐骨神经吻合处沿坐骨神经行径纵行植入高分子微球6颗,设为实验组,并设仅10/0丝线进行端端吻合神经的对照组作对比。植入后6周后,实验组大鼠术侧下肢活动度、小腿三头肌质量、坐骨神经传导速度及最大波幅明显优于对照组。与对照组相比,苏木精-伊红染色可见实验组新生神经纤维数量多,较密集,排列均匀,并可见新生的毛细血管,且髓鞘较厚。结果证实,搭载神经生长因子、神经营养素3、脑源性神经营养因子的聚乳酸-羟基乙酸共聚物复合微球可促进大鼠损伤坐骨神经的修复。

关键词: 神经再生, 生物材料, 生物相容性, 微球, 神经损伤, 神经修复, 聚乳酸-羟基乙酸共聚物, 神经生长因子, 神经营养素3, 脑源性神经营养因子

Abstract:

A variety of neurotrophic factors have been shown to repair the damaged peripheral nerve. However, in clinical practice, nerve growth factor, neurotrophin-3 and brain-derived neurotrophic factor are all peptides or proteins that may be rapidly deactivated at the focal injury site; their local effective concentration time following a single medication cannot meet the required time for spinal axons to regenerate and cross the glial scar. In this study, we produced polymer sustained-release microspheres based on the polylactic-co-glycolic acid copolymer; the microspheres at 300-μm diameter contained nerve growth factor, neurotrophin-3 and brain-derived neurotrophic factor. Six microspheres were longitudinally implanted into the sciatic nerve at the anastomosis site, serving as the experimental group; while the sciatic nerve in the control group was subjected to the end-to-end anastomosis using 10/0 suture thread. At 6 weeks after implantation, the lower limb activity, weight of triceps surae muscle, sciatic nerve conduction velocity and the maximum amplitude were obviously better in the experimental group than in the control group. Compared with the control group, more regenerating nerve fibers were observed and distributed in a dense and ordered manner with thicker myelin sheaths in the experimental group. More angiogenesis was also visible. Experimental findings indicate that polylactic-co-glycolic acid composite microspheres containing nerve growth factor, neurotrophin-3 and brain-derived neurotrophic factor can promote the restoration of sciatic nerve in rats after injury.

Key words: nerve regeneration, biological compatibility, microspheres, nerve injury, nerve repair, polylactic-co-glycolic acid copolymer, nerve growth factor, neurotrophin-3, brain-derived neurotrophic factor