中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (11): 1717-1722.doi: 10.3969/j.issn.2095-4344.3088

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

振荡电场刺激脊髓损伤模型大鼠抑制神经炎症反应促进功能恢复

方  超1,孙  健1,魏来福2,高  飞2,钱  军1,2   

  1. 1安徽医科大学第二附属医院,安徽省合肥市   230601;2安徽医科大学第一附属医院,安徽省合肥市   230031
  • 收稿日期:2020-03-09 修回日期:2020-03-13 接受日期:2020-05-16 出版日期:2021-04-18 发布日期:2020-12-21
  • 通讯作者: 钱军,博士,主任医师,硕士生导师,安徽医科大学第二附属医院,安徽省合肥市 230601;安徽医科大学第一附属医院,安徽省合肥市 230031
  • 作者简介:方超,男,1995年生,安徽省宿松县人,汉族,安徽医科大学在读博士,主要从事脊柱与脊髓损伤的研究。
  • 基金资助:
    国家自然科学基金项目(81471273),项目负责人,钱军

Oscillating field stimulation inhibits neuroinflammatory response and promotes functional recovery after spinal cord injury in rats

Fang Chao1, Sun Jian1, Wei Laifu2, Gao Fei2, Qian Jun1, 2    

  1. 1The Second Affiliated Hospital of Anhui Medical University, Hefei 230601, Anhui Province, China; 2The First Affiliated Hospital of Anhui Medical University, Hefei 230031, Anhui Province, China
  • Received:2020-03-09 Revised:2020-03-13 Accepted:2020-05-16 Online:2021-04-18 Published:2020-12-21
  • Contact: Qian Jun, MD, Chief physician, Master’s supervisor, the Second Affiliated Hospital of Anhui Medical University, Hefei 230601, Anhui Province, China; the First Affiliated Hospital of Anhui Medical University, Hefei 230031, Anhui Province, China
  • About author:Fang Chao, MD candidate, the Second Affiliated Hospital of Anhui Medical University, Hefei 230601, Anhui Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81471273 (to QJ)

摘要:

文题释义:
振荡电场:电场阴极刺激能显著促进轴突再生,而长期暴露于阳极的轴突最终萎缩。振荡电场即每隔15 min改变一次电场极性,减轻了电场阳极对神经轴突的抑制作用,使阴极对轴突生长的有益影响作用于头尾两个方向,从而实现轴突的双向生长。
损伤后炎症反应:炎症反应被认为是加速脊髓损伤病理生理变化的重要因素,包括趋化因子的募集、炎性细胞的浸润以及损伤局部星形胶质细胞和小胶质细胞的激活,这些变化加重了脊髓损伤的程度,使修复受损神经的难度显著增加。

背景:振荡场刺激是一种新兴的脊髓损伤治疗技术,在受伤的脊髓上施加电流可以促进愈合和组织再生。然而,振荡电场刺激导致脊髓损伤恢复的机制尚不完全清楚。
目的:探讨振荡电场能否通过减轻大鼠脊髓损伤后神经炎症反应促进神经功能恢复。
方法:雌性SD大鼠63只,随机被分为3组:实验组、脊髓损伤组和假手术组。假手术组大鼠仅行椎板切除术而不损伤脊髓;实验组和脊髓损伤组大鼠建立大鼠脊髓损伤模型,并在大鼠胸部(T9-T10)植入振荡电场刺激器装置,实验组在术后接受持续电刺激,脊髓损伤组不进行电刺激。用Basso-bettie-Bresnahan(BBB)评分法评价大鼠术后运动功能恢复情况;苏木精-伊红染色检测损伤部位组织修复和炎性细胞的募集;免疫荧光染色检测损伤部位星形胶质细胞和小胶质细胞的数量。动物实验方案由安徽医科大学实验动物伦理委员会批准,编号为LLSC20190736。
结果与结论:①BBB评分,实验组的BBB评分较脊髓损伤组显著增加;②苏木精-伊红染色结果表明,实验组损伤局部炎性细胞的数量较脊髓损伤组显著减少;③免疫荧光结果显示,实验组术后各时间点的神经胶质纤维酸性蛋白阳性细胞和小胶质细胞数量均明显少于脊髓损伤组;④结果说明,振荡电场刺激能改善大鼠脊髓损伤后的下肢运动功能,促进脊髓损伤后的组织修复,减轻炎性细胞募集,有效抑制星形胶质细胞和小胶质细胞的激活;提示振荡电场可以通过抑制脊髓损伤后炎症反应促进神经功能恢复。
https://orcid.org/0000-0003-2284-9323 (钱军)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程


关键词: 振荡电场, 脊髓, 脊髓损伤, 炎症, 功能恢复, 再生, 星形胶质细胞

Abstract: BACKGROUND: Oscillating field stimulation (OFS) is an emerging technology that has been used to treat spinal cord injury (SCI) with promising therapeutic effects. The application of electric current to the injured spinal cord is known to promote healing and tissue regeneration. However, the mechanisms by which OFS leads to SCI recovery are not yet fully understood.
OBJECTIVE: To investigate whether OFS can promote the recovery of neurological function by reducing neuroinflammatory responses after SCI in rats.
METHODS: Sixty-three female Sprague-Dawley rats were randomized into an experimental group, a SCI group and a sham operation group. Rats in the sham operation group only underwent laminectomy without damaging the spinal cord, and animal models of thoracic (T9-T10) SCI were established in the SCI and experimental groups. The OFS device was implanted into the injured site in the experimental group, followed by continuous electrical stimulation. Basso-Bettie-Bresnahan score was used to evaluate the recovery of motor function after SCI in rats. In addition, hematoxylin-eosin staining was used to test tissue repair and inflammatory cell recruitment. The number of astrocytes and microglia was examined by immunofluorescence staining. The study protocol was approved by the Animal Ethics Committee of Anhui Medical University, with an approval No. LLSC20190736.
RESULTS AND CONCLUSION: The Basso-Bettie-Bresnahan score of the experimental group was significantly higher than that of the SCI group. Hematoxylin-eosin staining results showed that the number of inflammatory cells in the injured site was considerably reduced in the experimental group compared with the SCI group. The results of immunofluorescence detection showed that the number of glial fibrillary acidic protein positive cells and microglia in the experimental group was dramatically lower than that in the SCI group at different time after surgery. These findings indicate that OFS can improve the motor function of lower limbs, promote tissue repair, reduce inflammatory cell recruitment, and inhibit the activation of astrocytes and microglia after spinal cord injury in rats. OFS can promote the recovery of neurological function by inhibiting inflammatory response after SCI.  


Key words: oscillating field, spinal cord, spinal cord injury, inflammation, functional recovery, regeneration, astrocyte

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