中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (29): 4669-4674.doi: 10.3969/j.issn.2095-4344.0625

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

Lingo-1介导Rho-ROCK通路调控神经干细胞的分化

彭志明,赵晓阳,朱  凯,万  勇   

  1. 中山大学附属第一医院脊柱外科,广东省广州市 510080
  • 修回日期:2018-05-14 出版日期:2018-10-18 发布日期:2018-10-18
  • 通讯作者: 万勇,教授,主任医师,中山大学附属第一医院脊柱外科,广东省广州市 510080
  • 作者简介:彭志明,男,1993年生,江西省上饶市人,汉族,中山大学附属第一医院脊柱外科在读硕士,主要从事神经干细胞与脊髓损伤相关研究。
  • 基金资助:

    国家自然科学基金(面上项目)(81472069,81171711)

Lingo-1 regulates neural stem cell differentiation via Rho-ROCK signaling pathway

Peng Zhi-ming, Zhao Xiao-yang, Zhu Kai, Wan Yong   

  1. Department of Spine Surgery, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
  • Revised:2018-05-14 Online:2018-10-18 Published:2018-10-18
  • Contact: Wan Yong, Professor, Chief physician, Department of Spine Surgery, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
  • About author:Peng Zhi-ming, Master candidate, Department of Spine Surgery, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, Guangdong Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81472069 and 81171711

摘要:

文章快速阅读:

文题释义:
Lingo-1:
由位于15q24-26染色体的LRRN6A基因表达的含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(leucine-rich repeats,LRR)蛋白家族成员,是一种特异表达于神经元和少突胶质细胞的功能蛋白,对轴突再生、成髓鞘细胞分化等过程可能具有重要的负向调控作用。
Lingo-1的重要意义:已有较多的相关研究显示Lingo-1在中枢神经系统损伤后神经元死亡、轴突变性等多种病理生理过程中发挥重要作用,Lingo-1拮抗剂亦已成为了促进脊髓损伤修复的研究热点之一。Lv等发现使用Lingo-1抗体可改善脊髓损伤模型动物神经元的存活,Zhang等发现敲除Lingo-1基因可促进脊髓脱髓鞘病变动物的轴突再生。但目前关于Lingo-1对于神经干细胞影响的研究相对较少,而后者是治疗中枢神经系统损伤的一种极具应用前景的种子细胞,故探索Lingo-1对神经干细胞的影响及其具体机制具有重要的科研价值与现实意义。

 

摘要
背景:
Lingo-1在神经元轴突再生、髓鞘形成等过程中具有重要作用,但其是否参与对神经干细胞分化的调控以及具体机制尚无定论。
目的:观察干预神经干细胞Lingo-1表达水平对其分化方向的影响,并探索其可能机制。
方法:从新生大鼠脑组织分离培养神经干细胞,经神经干细胞标志物检测鉴定后分别使用Lingo-1 shRNA慢病毒载体及阴性对照病毒转染神经干细胞,再用成神经元诱导分化培养基培养7 d,随后运用免疫荧光、免疫印迹技术检测神经元相关标志物表达,并检测RhoA、ROCK1蛋白表达水平。
结果与结论:①从新生大鼠脑组织所分离培养的神经干细胞呈浮球状生长,高表达神经干细胞特异性标志物Nestin、Sox2与Pax6,符合神经干细胞特征;②慢病毒载体转染可在mRNA及蛋白质水平实现对神经干细胞Lingo-1的干扰,经诱导培养7 d后Lingo-1敲低的神经干细胞分化为神经元的比例显著增加,且伴随着RhoA、ROCK1蛋白表达水平的下降;③结果表明,Lingo-1参与对神经干细胞分化方向的调控,抑制Lingo-1可促进其向神经元方向分化,该过程可能与调控Rho-ROCK通路有关。

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:
0000-0003-3399-7452(彭志明)

关键词: 神经干细胞, 巢蛋白, β-微管蛋白Ⅲ, 微管相关蛋白2, Rho/ROCK通路, Lingo-1蛋白, 细胞分化, 干细胞, 国家自然科学基金

Abstract:

BACKGROUND: It has been reported that Lingo-1 plays an important role in neuronal axon regeneration and myelination, but whether it participates in the regulation of neural stem cell differentiation remains unknown.
OBJECTIVE: To examine the effect of Lingo-1 knockdown on the differentiation of neural stem cells and to explore its potential mechanism.
METHODS: Neural stem cells were isolated from neonatal rat brain tissue and identified by determination of several neural stem cell specific markers. Then the cells were transfected with Lingo-1 shRNA lentivirus or negative control vectors, and were further cultured in induced differentiation medium for 7 days. Immunofluorescence and western blot techniques were thereafter used to detect the expression of neuron specific markers and to examine expression levels of RhoA and ROCK1.
RESULTS AND CONCLUSION: The cells isolated from brain tissue of neonatal rats aggregated to form non-adherent spherical clusters with high expression of Nestin, Sox2, and Pax6, specific markers of neural stem cells, which exhibited the characteristics of neural stem cells. After transfected with lentivirus, expression of Lingo-1 was successfully knocked down at mRNA and protein levels. After 7 days of induction, expression of neuron specific markers was significantly increased in Lingo-1 knocked-down neural stem cells. Meanwhile, expressions of RhoA and ROCK1 were decreased. Thus, Lingo-1 can be involved in the differentiation of neural stem cells. Inhibition of Lingo-1 can induce neural stem cells to differentiate into neurons, which is possibly related to the regulation of Rho-ROCK signaling pathway.

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: Neural Stem Cells, Cell Differentiation, Neurons, Tissue Engineering

中图分类号: