中国组织工程研究 ›› 2014, Vol. 18 ›› Issue (33): 5323-5328.doi: 10.3969/j.issn.2095-4344.2014.33.013

• 神经组织构建 nerve tissue construction • 上一篇    下一篇

脊髓损伤大鼠远端神经元及骨骼肌的变化

王元元1,洪  毅2,3,王雪菲3,蔡  青4,唐和虎2,3,李  想2,3,梁广旭3,张军卫2,3   

  1. 1北京市第二医院,北京市  100031;2中国康复研究中心脊柱脊髓外科,北京市  100068;3首都医科大学康复医学院,北京市  100069;4首都医科大学实验与测试中心,北京市   100069
  • 出版日期:2014-08-13 发布日期:2014-08-13
  • 通讯作者: 张军卫,副教授,硕士生导师,中国康复研究中心脊柱脊髓外科,北京市 100068;首都医科大学康复医学院,北京市 100069
  • 作者简介:王元元,女,1984年生,安徽省灵璧县人,汉族,2012年首都医科大学毕业,硕士,医师,主要从事脊柱外科及脊髓损伤康复研究。

Change of motor neurons and skeletal muscles distal to the lesion after spinal cord injury in rats

Wang Yuan-yuan1, Hong Yi 2, 3, Wang Xue-fei3, Cai Qing4, Tang He-hu 2, 3, Li Xiang 2, 3, Liang Guang-xu 3, Zhang Jun-wei 2, 3   

  1. 1 Department of Rehabilitation, the Second Hospital of Beijing, Beijing 100031, China; 2 Department of Spine Surgery, China Rehabilitation Research Center, Beijing 100068, China; 3 School of Rehabilitation Medicine, Capital Medical University, Beijing 100069, China; 4 Core Facilities Center, Capital Medical University, Beijing 100069, China
  • Online:2014-08-13 Published:2014-08-13
  • Contact: Zhang Jun-wei, Associate professor, Master’s supervisor, Department of Spine Surgery, China Rehabilitation Research Center, Beijing 100068, China; School of Rehabilitation Medicine, Capital Medical University, Beijing 100069, China
  • About author:Wang Yuan-yuan, Master, Physician, Department of Rehabilitation, the Second Hospital of Beijing, Beijing 100031, China

摘要:

背景:目前针对脊髓损伤病灶的研究较多,而对脊髓损伤后远端神经、肌肉及运动终板三者形态结构实时变化观察和研究的文献很少。
目的:观察大鼠脊髓损伤后远端肢体神经、运动终板和骨骼肌随时间推移形态学变化的自然病程。
方法:将50只雌性SD大鼠随机分为对照组5只(不做处理)、假手术组10只和脊髓损伤组35只,假手术组行单纯椎板切除术,脊髓损伤组在椎板切除基础上,用横断法制成T10完全脊髓损伤模型,然后在第1,2,4,12,24周分别观察3组大鼠坐骨神经-运动终板-内侧腓肠肌的形态变化。
结果与结论: ①脊髓损伤组大鼠4周时部分有髓神经纤维髓鞘出现板层分离;24周时崩解髓鞘板层已模糊、碎裂髓鞘增多,薄髓与无髓神经纤维较12周时增多。②脊髓损伤组大鼠运动终板在脊髓损伤12周时明显退变突触结构与较完整突触结构并存;24周时已找不到运动终板。③脊髓损伤组大鼠内侧腓肠肌在脊髓损伤24周时,肌细胞融合,细胞核密集,融合细胞间可见大小不一空隙,结缔组织增生更加明显。结果表明大鼠在完全性横断性脊髓损伤后自然病程中,损伤平面以下周围神经、运动终板、骨骼肌的形态结构均呈规律性改变,损伤后12周时已有显著变化,24周时呈结构毁坏性改变。



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


全文链接:

关键词: 组织构建, 组织工程, 脊髓损伤, 坐骨神经, 运动终板, 腓肠肌, 髓鞘板层, 突触, 透射电镜

Abstract:

BACKGROUND: The majority of studies focus on the lesions of spinal cord injury, while little evidence is available on the change of morphology and structure of distal nerve, muscle and motor endplates following spinal cord injury.
OBJECTIVE: To investigate the time window change of the morphology of motor neurons and skeletal muscles caudal to the lesion after spinal cord injury in rats.
METHODS: Fifty healthy adult Sprague-Dawley rats were randomly divided into three groups: control group (n=5; without treatment), sham operation group (n=10), and spinal cord injury group (n=35). The sham operated rats only received laminectomy. In the spinal cord injury group, rats were subject to complete T10 spinal cord injury by total laminectomy and cord transverse resection. Then the morphological change including sciatic nerve, motor endplate and median gastrocnemius was observed for each group at 1, 2, 4, 12, 24 weeks after injury.
RESULTS AND CONCLUSION: (1) The myelin sheath layers of sciatic nerve were separated partially at 4 weeks in rats with spinal cord injury, the myelin sheaths were fragmented with the regeneration of thin-myelinated and unmyelinated axons at 12 weeks. There was a decrease in myelinated axons and an increase in thin-myelinated 
and unmyelinated axons at 24 weeks. (2) The synaptic gutters of motor endplate, the presynaptic and postsynaptic membrane and synaptic space were distinct at 4 weeks in rats with spinal cord injury, the degenerated motor endplates coexsisted with the intact ones at 12 weeks. The motor endplate disappeared at 24 weeks. (3) There was a slight decrease in muscle cross-sectional area at 2 weeks in rats with spinal cord injury, but no structural change was found, the membrane of myocytes was partially weakened at 4 weeks, the border of myocytes was obscure with hyperplasia of connective tissue at 12 weeks, and myocytes gathered and in fusion at 24 weeks. As natural history of completely transected spinal cord injury in rats, there were significant changes in morphology of peripheral nerve, motor endplate and skeletal muscles caudal to the lesion at 12 weeks, and the changes were destructive at 24 weeks.



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


全文链接:

Key words: spinal cord injury, neurons, skeletal muscles, morphology

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