中国神经再生研究(英文版) ›› 2015, Vol. 10 ›› Issue (1): 90-94.doi: 10.4103/1673-5374.150714

• 原著:周围神经损伤修复保护与再生 • 上一篇    下一篇

电刺激延迟修复损伤坐骨神经:谁在影响神经再生?

  

  • 收稿日期:2014-12-16 出版日期:2015-01-15 发布日期:2015-01-15
  • 基金资助:

    国家重点基础研究发展计划(973计划,No. 2014CB542206); 教育部创新团队(IRT1201);国家自然科学基金(31271284,31171150,81171146,30971526,31100860,31040043);教育部新世纪优秀人才支持计划(No. BMU20110270)。

Electrical stimulation does not enhance nerve regeneration if delayed after sciatic nerve injury: the role of fibrosis

Na Han, Chun-gui Xu, Tian-bing Wang, Yu-hui Kou, Xiao-feng Yin, Pei-xun Zhang *, Feng Xue *   

  1. Department of Trauma and Orthopedics, Peking University People’s Hospital, Beijing, China
  • Received:2014-12-16 Online:2015-01-15 Published:2015-01-15
  • Contact: Pei-xun Zhang, Ph.D., zhangpeixun@163.com. Feng Xue, Ph.D., drxue@gmail.com.
  • Supported by:

    This study was supported by grants from the National Program on Key Basic Research Project of China (973 Program), No. 2014CB542206;  Program for Innovative Research Team in University of Ministry of Education of China, No. IRT1201; the National Natural Science Foundation of China, No. 31271284, 31171150, 81171146, 30971526, 31100860, 31040043, 31440055; the Natural Science Foundation of Beijing of China, No. 7142164; and Program for New Century Excellent Talents in University of Ministry of Education of China, No. BMU20110270.

摘要:

电刺激已被证明可以提高损伤感觉和运动神经再生的速度和准确性,但对延迟修复的损伤周围神经组织已形成不同程度的纤维化时的作用目前研究较少。我们对坐骨神经横断性损伤模型大鼠在损伤后1 d、1周、1,2个月后进行生物可吸收套管套接修复后将其为2个亚组:实验组大鼠在神经修复完成后,给予1 h直流电压3 V,频率 20 Hz,波宽100 ms的电刺激,对照组大鼠不给予电刺激。修复后5 d,Masson染色结果发现,在延迟1 d和延迟1周修复组,无论是对照组还是实验组,Masson染色胶原纤维面积比例都不超过20%,但随着神经损伤后修复时间的延迟,胶原纤维面积逐渐增大;免疫组织化学结果显示,在延迟1 d和延迟1周修复组中,标志组织纤维化的转化生长因子β表达较少,而在延迟1个月和延迟2个月修复组中,转化生长因子β表达较多。结果说明,坐骨神经损伤后使用生物可吸收套管延迟套接神经修复,并预以电刺激,延迟修复时间越晚,效果越差。坐骨神经损伤1个月后,组织退变及神经远端组织发生了纤维化,是电刺激不再能够有效促进延迟修复损伤神经再生的原因之一。

关键词: 神经再生, 周围神经损伤, 电刺激, 生物可吸收套管, 延迟修复, 成纤维细胞, 胶原纤维, 转化生长因子β, Masson染色, 神经保护, 免疫组织化学染色, 国家自然科学基金

Abstract:

Electrical stimulation has been shown to accelerate and enhance nerve regeneration in sensory and motor neurons after injury, but there is little evidence that focuses on the varying degrees of fibrosis in the delayed repair of peripheral nerve tissue. In this study, a rat model of sciatic nerve transection injury was repaired with a biodegradable conduit at 1 day, 1 week, 1 month and 2 months after injury, when the rats were divided into two subgroups. In the experimental group, rats were treated with electrical stimuli of frequency of 20 Hz, pulse width 100 ms and direct current voltage of 3 V; while rats in the control group received no electrical stimulation after the conduit operation. Histological results showed that stained collagen fibers comprised less than 20% of the total operated area in the two groups after delayed repair at both 1 day and 1 week but after longer delays, the collagen fiber area increased with the time after injury. Immunohistochemical staining revealed that the expression level of transforming growth factor β (an indicator of tissue fibrosis) decreased at both 1 day and 1 week after delayed repair but increased at both 1 and 2 months after delayed repair. These findings indicate that if the biodegradable conduit repair combined with electrical stimulation is delayed, it results in a poor outcome following sciatic nerve injury. One month after injury, tissue degeneration and distal fibrosis are apparent and are probably the main reason why electrical stimulation fails to promote nerve regeneration after delayed repair.

Key words: nerve regeneration, peripheral nerve injury, electrical stimulation, bioabsorbable conduit, delayed repair, fibroblast, collagen fibers, transforming growth factor β, Masson staining, neuroprotection, immunohistochemistry, NSFC grants, neural regeneration