中国组织工程研究 ›› 2017, Vol. 21 ›› Issue (33): 5394-5399.doi: 10.3969/j.issn.2095-4344.2017.33.023

• 干细胞培养与分化 stem cell culture and differentiation • 上一篇    下一篇

LINGO-1在脊髓神经干细胞分化过程中的表达特征及效应

许 刚1,赵晨光2,孙 玮2,琚 芬2,袁 华2,牟 翔2   

  1. 1解放军新疆军区总医院全军骨科中心,新疆维吾尔自治区乌鲁木齐市 830000;2空军军医大学第一附属医院康复医学科,陕西省西安市 710032
  • 修回日期:2017-06-18 出版日期:2017-11-28 发布日期:2017-12-01
  • 通讯作者: 赵晨光,博士,主治医师,空军军医大学第一附属医院康复医学科,陕西省西安市 710032
  • 作者简介:许刚,男,1970年生,浙江省杭州市人,汉族,1996年解放军第四军医大学毕业,硕士,主任医师,主要从事脊柱及创伤骨科方向研究。
  • 基金资助:

    新疆维吾尔自治区自然科学基金(2016D01C395)

The expression and effect of LINGO-1 during the differentiation of spinal cord derived neural stem cells

Xu Gang1, Zhao Chen-guang2, Sun Wei2, Ju Fen2, Yuan Hua2, Mou Xiang2   

  1. 1Orthopedic Center of Chinese PLA, General Hospital of Xinjiang Military Region, Urumqi 830000, Xinjiang Uygur Autonomous Region, China; 2Department of Rehabilitation, Xijing Hospital, Air Force Military Medical University, Xi’an 710032, Shaanxi Province, China
  • Revised:2017-06-18 Online:2017-11-28 Published:2017-12-01
  • Contact: Zhao Chen-guang, M.D., Attending physician, Department of Rehabilitation, Xijing Hospital, Air Force Military Medical University, Xi’an 710032, Shaanxi Province, China
  • About author:Xu Gang, Master, Chief physician, Orthopedic Center of Chinese PLA, General Hospital of Xinjiang Military Region, Urumqi 830000, Xinjiang Uygur Autonomous Region, China
  • Supported by:

    the Natural Science Foundation of Xinjiang Uygur Autonomous Region, No. 2016D01C395

摘要:

文章快速阅读:

文题释义:
LINGO-1:
是由614个氨基酸构成的跨膜生物蛋白,定位于15q24.3。由LINGO-1及NgR、P75/Troy组成的共同复合受体在髓鞘源性抑制因子介导的多种生理作用中扮演了重要的角色。研究表明,LINGO-1可以通过NgR1/P75/LINGO-1或NgR1/Troy/LINGO-1调节调控轴突延伸和再生、调控神经元存活以及调控少突胶质细胞成熟及再髓鞘化。
神经干细胞:Mckay 于1997年在《Science》上将神经干细胞的概念总结为:具有分化为神经元、星形胶质细胞及少突胶质细胞的能力,能自我更新并足以提供大量脑组织细胞的细胞。神经干细胞移植可以通过分化为神经元替代损伤区缺损的神经元,也可以通过旁分泌作用分泌神经生长因子作用于脊髓内源性的神经干/祖细胞,也可以通过分化为少突胶质细胞促进轴突的再髓鞘化等机制修复脊髓损伤,促进功能恢复。

 

摘要
背景:
研究LINGO-1在脊髓神经干细胞分化过程中的表达及效应对调控神经干细胞分化及修复脊髓损伤有着重要的意义。
目的:观察LINGO-1在脊髓神经干细胞分化过程中的表达特征及生物学作用。
方法:体外培养大鼠脊髓神经干细胞,并对培养细胞进行Nestin染色干性鉴定及诱导分化多能性鉴定。于分化第0天及第5天进行LINGO-1与Nestin(神经干细胞)、β-Tubulin Ⅲ(神经元细胞)、GFAP(星形胶质细胞)及O4(少突胶质细胞)免疫荧光双染色,观察LINGO-1的表达特征。体外培养的大鼠脊髓神经干细胞分为对照组及干扰组,干扰组脊髓神经干细胞感染LINGO-1 shRNA慢病毒下调LINGO-1表达,对照组脊髓神经干细胞感染Scramble-shRNA慢病毒,于感染第5天免疫荧光染色检测神经元突起长度。
结果与结论:①脊髓神经干细胞可以分化成为神经元、星形胶质细胞和少突胶质细胞;②LINGO-1在脊髓神经干细胞及其分化的神经元、少突胶质细胞中表达,但不在星形胶质细胞中表达;③下调LINGO-1表达后,干扰组神经元突起长度较对照组明显增长,差异有显著性意义(P < 0.05);④结果表明,体外培养的脊髓神经干细胞具有多项分化潜能,LINGO-1在脊髓神经干细胞及分化早期的神经元、少突胶质细胞中表达,但不在星形胶质细胞中表达。LINGO-1对分化后神经元突起生长具有负性调控作用。

 

关键词: 干细胞, 神经干细胞, LINGO-1, 脊髓神经干细胞, 克隆球, 突起, 新疆维吾尔自治区自然科学基金

Abstract:

BACKGROUND: It is of great significance to explore the expression and effect of LINGO-1 in the differentiation of spinal cord derived neural stem cells (SpNSCs) for regulating neural stem cell differentiation and repairing spinal cord injury.
OBJECTIVE: To investigate the expression features and biological effects of LINGO-1 in the differentiation of SpNSCs. 
METHODS: SpNSCs were isolated from the rat spinal cord and cultured in vitro. The expression characteristics of LINGO-1 was observed through double immunofluorescence staining of LINGO-1 and Nestin (neural stem cells), β-Tubulin III (neurons), GFAP (astrocytes) and O4 (oligodendrocyte) at 0-5 days of differentiation. SpNSCs isolated from the rat spinal cord were cultured in vitro and divided into siRNA group and control group. The siRNA group was transfected with LINGO-1 shRNA lentiviral vector to down-regulate the expression of LINGO-1, and the control group was transfected with Scramble-shRNA lentiviral vector. The growth of neurites was detected by immunofluorescence staining at 5 days after transfection. 
RESULTS AND CONCLUSION: The SpNSCs could differentiate into neurons, astrocytes and oligodendrocytes. LINGO-1 was expressed in SpNSCs, neurons and oligodendrocytes, but not in astrocytes. The neurite length of the siRNA group was significantly longer than that of the control group (P < 0.05). In summary, the SpNSCs have the potential of multi-directional differentiation, and LINGO-1 has a negative effect on the neurite growth.

 

Key words: Spinal Cord, Neural Stem Cells, Cell Differentiation, Tissue Engineering

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