中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (5): 686-691.doi: 10.3969/j.issn.2095-4344.0436

• 干细胞移植 stem cell transplantation • 上一篇    下一篇

亚低温干预并神经干细胞蛛网膜下腔移植修复大鼠脊髓损伤

张建军,王 东,史焕昌,杨卫山,王 琳   

  1. 天津市第四中心医院神经外科,天津市 300140
  • 修回日期:2017-09-18 出版日期:2018-02-18 发布日期:2018-02-18
  • 作者简介:张建军,男,1980年生,河北省沽源县人,汉族,2010年天津医科大学毕业,硕士,主治医师,主要从事神经损伤修复、神经外科相关研究。
  • 基金资助:

    天津市自然科学基金(12JCYBJC18000,17JCY13JC27300)

Mild hypothermia with subarachnoid transplantation of neural stem cells to repair spinal cord injury in rats

Zhang Jian-jun, Wang Dong, Shi Huan-chang, Yang Wei-shan, Wang Lin   

  1. Department of Neurosurgery, Tianjin Fourth Central Hospital, Tianjin 300140, China
  • Revised:2017-09-18 Online:2018-02-18 Published:2018-02-18
  • About author:Zhang Jian-jun, Master, Attending physician, Department of Neurosurgery, Tianjin Fourth Central Hospital, Tianjin 300140, China
  • Supported by:

    the Natural Science Foundation of Tianjin, No. 12JCYBJC18000,17JCY13JC27300

摘要:

文章快速阅读:

文题释义:
低温疗法:
是一种以物理方法将患者的体温降低到预期水平而达到治疗疾病目的的方法。根据治疗温度的不同,分为深低温治疗、低温治疗、亚低温治疗等。研究发现亚低温对脑血流有调节作用,包括降低脑氧代谢率和改善细胞能量代谢,减少兴奋性氨基酸的释放,减少氧自由基的生成,减少细胞内钙超载,增加神经元泛素的合成,减少神经元坏死和凋亡,促进细胞间信号传导的恢复,减少脑梗死的体积,减轻脑水肿和降低颅内压等。
诱发电位:指中枢神经系统在感觉外在或内在刺激过程中产生的生物电活动。代表中枢神经系统特定功能状态下的生物电活动。

 

摘要
背景:
研究表明,亚低温治疗能发挥调控神经干细胞凋亡、增殖、分化的作用。
目的:探讨亚低温干预联合大鼠神经干细胞蛛网膜下腔移植对脊髓损伤大鼠损伤神经功能恢复的影响。  
方法:成年SD大鼠110只,随机取20只为假手术组,余90只大鼠采用改良Allen打击法于T9节段建立脊髓损伤模型,成功造模80只,随机分为脊髓损伤组、亚低温组、神经干细胞组、联合组,每组20只。亚低温组将大鼠放在冰毯上,维持亚低温(34.0±0.5) ℃ 3 d;神经干细胞移植组,将大鼠体温维持37 ℃,6 h后蛛网膜下腔植入1×104 L-1神经干细胞悬液1 mL,1次/d,连续3 d;联合组采用亚低温和神经干细胞联合治疗。分别于造模后1,3 d和1,2,3,4周通过BBB评分和斜板实验测定大鼠双下肢运动功能。造模后4周,取材行病理切片苏木精-伊红染色,采用RT-PCR检测脊髓损伤区周围Caspase-3、BCL-2、Syn基因的表达,通过检测体感诱发电位和运动诱发电位观察大鼠神经电生理恢复情况。
结果与结论:①联合组大鼠下肢运动功能优于神经干细胞组及亚低温组,神经干细胞组及亚低温组优于脊髓损伤组;②造模后4周,与脊髓损伤组相比,联合组Caspase-3基因表达显著降低(P < 0.05);Bcl-2及Syn基因表达显著升高(P < 0.05);③造模后4周,脊髓损伤组可见脊髓空洞形成。神经干细胞组及亚低温组损伤区脊髓空洞较小,联合组脊髓空洞几乎消失;④造模后4周,体感诱发电位和运动诱发电位的潜伏期:联合组<神经干细胞组和亚低温组<脊髓损伤组,组间差异有显著性意义(P < 0.05);体感诱发电位和运动诱发电位的波幅:联合组>神经干细胞组和亚低温组>脊髓损伤组,组间差异有显著性意义(P < 0.05);⑤结果表明,亚低温干预联合大鼠神经干细胞蛛网膜下腔移植可促进脊髓损伤大鼠神经突触的再生,降低脊髓损伤区周围Caspase-3基因表达,促进Bcl-2及Syn基因表达,改善大鼠的肢体运动功能和电生理功能。

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程
ORCID: 0000-0003-2528-3644(张建军)

关键词: 亚低温, 脊髓损伤, 神经干细胞, 移植, 干细胞, 运动功能, 大鼠, 天津市自然科学基金

Abstract:

BACKGROUND: Studies have shown that mild hypothermia therapy can regulate the apoptosis, proliferation and differentiation of neural stem cells (NSCs).
OBJECTIVE: To explore the effect of mild hypothermia therapy combined with subarachnoid NSCs transplantation on functional recovery from spinal cord injury (SCI) in rats.
METHODS: The 20 of 110 Sprague-Dawley rats were randomly selected as sham group, and the remaining 90 rats were used to make spinal cord injury models using modified Allen’s method. After modeling, 80 successful models were randomized into SCI, mild hypothermia, NSCs, and combined groups (n=20 per group). Rats in the mild hypothermia group were placed onto an ice blanket at a temperature of (34.0±0.5) ℃ for 3 days. Rats in the NSCs group were raised at 37 ℃ and implanted with 1×104/L NSCs suspension (1 mL, once a day, for continuous 3 days) into the subarachnoid space at 6 hours after modeling. Rats in the combined group were given the combined treatment of mild hypothermia and NSCs transplantation. Motor functional assessment for the bilateral rat lower limbs was performed based on Basso, Beattie and Bresnahan scoring and inclined plate test at 1, 3 days and 1, 2, 3, 4 weeks after modeling. At 4 weeks after modeling, pathological detection by hematoxylin-eosin staining was done; RT-PCR was used to detect expression of Caspase-3, BCL-2 and Syn around the injured region; and electrophysiological recovery of the nerves was assessed based on somatosensory and motor evoked potentials. 
RESULTS AND CONCLUSION: (1) Lower limb motor function of the rats was improved after NSCs transplantation, mild hypothermia therapy or their combined use, especially in the combined group. (2) At 4 weeks after modeling, there was significant reduced Caspase-3 and significantly increased Bcl-2 and Syn in the combined group compared with the SCI group (both P < 0.05). (3) At 4 weeks after modeling, cystic cavities in the spinal cord formed in the SCI group, became smaller in the NSCs and mild hypothermia groups, and almost disappeared in the combined group. (4) At 4 weeks after modeling, the latency of somatosensory and motor evoked potentials was shortest in the combined group, followed by the NSCs and mild hypothermia groups, and longest in the SCI group. A significant difference was found among groups (P < 0.05). The amplitudes of somatosensory and motor evoked potentials were ranked as follows: combined group > NSCs group and mild hypothermia group > SCI group, and there was also a significant difference among groups (P < 0.05). In summary, the combined use of mild hypothermia and NSCs transplantation via the subarachnoid space can promote synaptic regeneration, reduce Caspase-3 mRNA expression, increase Bcl-2 and Syn mRNA expression, and improve motor and electrophysiological functions of the lower limbs in rats.

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

Key words: Spinal Cord Injuries, Neural Stem Cells, Hypothermia, Tissue Engineering

中图分类号: