中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (27): 4043-4048.doi: 10.3969/j.issn.2095-4344.2016.27.013

• 脑及脊髓损伤动物模型 Animal models of brain and spinal cord injuries • 上一篇    下一篇

脑白质损伤模型中Lingo-1的动态变化

索  磊1,杨印祥2,汤文燕2,栾  佐1   

  1. 1南方医科大学第三临床医学院,广东省广州市  510515
    2解放军海军总医院儿科,北京市 100048
  • 修回日期:2016-04-08 出版日期:2016-06-30 发布日期:2016-06-30
  • 通讯作者: 栾佐,硕士,主任医师,博士生导师,南方医科大学第三临床医学院,广东省广州市 510515
  • 作者简介:索磊,男,1989年生,陕西省西安市人,汉族,南方医科大学在读硕士,医师,主要从事儿童神经系统疾病以及干细胞移植方面的研究。
  • 基金资助:

    国家自然科学基金面上项目(81471486)

Dynamic expression of Lingo-1 in a model of white matter injury

Suo Lei1, Yang Yin-xiang2, Tang Wen-yan2, Luan Zuo1   

  1. 1Third Clinical College of Southern Medical University, Guangzhou 510515, Guangdong Province, China
    2Department of Pediatrics, Navy General Hospital of People’s Liberation Army, Beijing 100048, China
  • Revised:2016-04-08 Online:2016-06-30 Published:2016-06-30
  • Contact: Luan Zuo, Master, Chief physician, Doctoral supervisor, Third Clinical College of Southern Medical University, Guangzhou 510515, Guangdong Province, China
  • About author:Suo Lei, Studying for master’s degree, Physician, Third Clinical College of Southern Medical University, Guangzhou 510515, Guangdong Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81471486

摘要:

文章快速阅读:

文题释义:
脑白质损伤:
近年来随着新生儿重症监护病房的建立和发展,早产儿的存活率显著提高,早产儿是脑白质损伤的高危人群。由于胎儿成熟度、感染、缺氧缺血、营养等危险因素所致的早产儿出现脑室周围及皮质下白质出现广泛损伤,最终导致神经系统后遗症,如脑瘫、认知障碍、视听功能异常、癫痫等。遗憾的是,目前国际上对于脑白质损伤没有任何有效的治疗方法。
Lingo-1蛋白:是一个614个氨基酸组成的跨膜蛋白,属于富含亮氨酸重复片段结构域蛋白家族一员,其家族成员还有Lingo-2、Lingo-3以及Lingo-4等。研究证实Lingo-1是一种特异性表达于中枢神经系统的神经元和少突胶质细胞中的重要功能蛋白,尚未在星形胶质细胞中发现Lingo-1蛋白的存在。早期研究发现Lingo-1可以抑制轴突生长,近年来研究表明Lingo-1在神经元轴突的髓鞘化过程中也发挥了重要的负调控作用。

 

摘要
背景:
Lingo-1在少突胶质细胞分化和髓鞘形成过程中发挥了重要的负调控作用,其与脑白质损伤可能密切相关,但目前关于脑白质损伤后Lingo-1动态变化的研究,国内尚未见系统报道。
目的:观察Lingo-1在脑白质损伤模型不同时间窗的动态表达变化情况。
方法:将78只3 d龄SD大鼠随机等分为假手术组和模型组,模型组采用单侧结扎右颈总动脉联合缺氧方法建立脑白质损伤模型,假手术组仅分离右颈总动脉,不作结扎缺氧处理。
结果与结论:造模7 d后苏木精-伊红染色以及免疫荧光髓鞘碱性蛋白染色证实模型大鼠白质损伤区呈现选择性白质损伤,提示造模成功。荧光定量qPCR及Western blot结果显示,造模1 d后Lingo-1 mRNA及蛋白表达水平即开始明显增高,7 d时达到峰值,此后逐渐降低,至28 d时已基本接近假手术组水平。提示Lingo-1蛋白与脑白质损伤髓鞘损伤密切相关。

 

 

关键词: 实验动物, 神经损伤与修复动物模型, 脑白质损伤, 脑损伤, Lingo-1, 新生鼠, 髓鞘碱性蛋白, 国家自然科学基金

Abstract:

BACKGROUND: Lingo-1 has been identified as a negative regulator of oligodendrocyte differentiation and myelination, which may be closely related to the white matter damage, but there is no systematic report on the dynamic changes of Lingo-1 after white matter damage. 
OBJECTIVE: To explore the dynamic expression of Lingo-1 at different time points after white matter injury in newborn rats.
METHODS: Seventy-eight Sprague-Dawley rats aged 3 days old were equally and randomly divided into sham operation group and model group. In the model group, models of white matter injury were established by unilateral ligation of the right common carotid artery combined with hypoxia. In the sham operation group, the right common carotid artery was isolated only, without ligation or hypoxia. 
RESULTS AND CONCLUSION: At 7 days after model induction, hematoxylin-eosin staining and immunohistochemical staining for myelin basic protein showed that a selective white matter injury was seen at the injury site of a rat model, suggesting successful model establishment. Fluorescent quantitative PCR and western blot assay results demonstrated that the expression levels of Lingo-1 mRNA and protein were significantly up-regulated at 1 day and reached a peak at 7 days post-surgery. After 7 days, above expression was gradually decreased and the up-regulation of Lingo-1 protein lasted to the 28 days post-surgery compared to the sham operation group. These results show that Lingo-1 protein was closely related to the brain white matter injury.

 

 

Key words: Myelin Sheath, Anoxia, Tissue Engineering

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