中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (1): 20-25.doi: 10.3969/j.issn.2095-4344.2016.01.004

• 骨髓干细胞 bone marrow stem cells • 上一篇    下一篇

Let-7c慢病毒载体对骨髓间充质干细胞体外诱导分化为神经细胞的影响

王 静,赵绍云,李明哲,景黎君,焦淑洁,彭 涛,滕军放,贾延劼   

  1. 郑州大学第一附属医院神经内科,河南省郑州市 450052
  • 收稿日期:2015-11-30 出版日期:2016-01-01 发布日期:2016-01-01
  • 通讯作者: 贾延劼,博士后,主任医师,郑州大学第一附属医院神经内科,河南省郑州市 450052
  • 作者简介:王静,女,1990年生,河南省淅川县人,汉族,2016年郑州大学毕业,硕士,主要从事干细胞在神经系统疾病中的应用研究。
  • 基金资助:
    国家自然科学基金项目(骨髓间充质干细胞神经命运决定中的自噬现象及其mTOR信号通路的作用/ 81071114;Lin28/let-7调控的骨髓间充质干细胞移植治疗阿尔兹海默病的实验研究/81371385)

Effect of Let-7c on neural differentiation of bone marrow mesenchymal stem cells in vitro

Wang Jing, Zhao Shao-yun, Li Ming-zhe, Jing Li-jun, Jiao Shu-jie, Peng Tao, Teng Jun-fang, Jia Yan-jie   

  1. Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
  • Received:2015-11-30 Online:2016-01-01 Published:2016-01-01
  • Contact: Jia Yan-jie, M.D., Chief physician, Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
  • About author:Wang Jing, Master, Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81071114, 81371385

摘要:

文章快速阅读:

 

文题释义:
微小RNA:是一类内源性的长20-25个核苷酸的非编码RNA,通常靶向一个或者多个mRNA,通过翻译水平的抑制或断裂靶标mRNAs而调节基因的表达,进而参与骨髓间充质干细胞的重要生物学进程,包括发育、细胞增殖、分化、凋亡等多种过程。

慢病毒载体:是目前分子及细胞生物实验中非常有效的工具,在基因转染方面有着许多独特的优势,可将其携带的外源基因整合到宿主基因组,保证转基因长期稳定表达,且不编码病毒蛋白,并在中枢神经系统中不会引起免疫反应。

 

背景:微小RNA参与调控干细胞增殖、分化、衰老等过程,通过了解Let-7家族成员Let-7c对骨髓间充质干细胞向神经细胞分化的影响可以为干细胞移植治疗提供新思路。
目的:探讨Let-7c慢病毒载体在体外诱导大鼠骨髓间充质干细胞向神经细胞分化中的作用。
方法:构建Let-7c上调及下调慢病毒载体并体外转染大鼠骨髓间充质干细胞,筛选最适转染复数;实验分为未转染组、阴性转染组(转染空白慢病毒)、转染上调组(转染LV-rno-Let-7c-up)、转染下调组(转染LV-rno-Let-7c-5p-inhibition);采用法舒地尔诱导转染后的大鼠骨髓间充质干细胞分化为神经细胞,倒置荧光显微镜下观察骨髓间充质干细胞转染后荧光表达,免疫细胞化学染色检测神经元标记物NSE和MAP-2的表达,RT-PCR检测MAP-2 mRNA的表达,MTT法检测细胞存活率。
结果与结论:倒置荧光显微镜下观察大鼠LV-rno-Let-7c-up和LV-rno-Let-7c-5p- inhibition慢病毒载体转染成功。法舒地尔可以诱导骨髓间充质干细胞分化为神经细胞,与阴性转染组相比,转染上调组的诱导效率升高(P < 0.05),NSE和MAP-2表达率上升(P < 0.05),转染下调组的诱导效率下降,NSE和MAP-2表达率下降(P < 0.05)。转染LV-rno-Let-7c-up后骨髓间充质干细胞经法舒地尔诱导向神经细胞分化比率增加,Let-7c可能具有促进骨髓间充质干细胞向神经细胞分化的作用。 

关键词: 干细胞, 骨髓干细胞, 骨髓间充质干细胞, let-7c, 神经元, 慢病毒, 转染, 神经分化, 国家自然科学基金

Abstract:

BACKGROUND: The microRNAs are involved in regulation of stem cell proliferation, differentiation and aging. To study the effect of Let-7c, a member of Let-7, on the neural differentiation of bone marrow mesenchymal stem cells provides new ideas for stem cell therapy.
OBJECTIVE: To investigate the role of Let-7c in the neural differentiation of bone marrow mesenchymal stem cells.
METHODS: The lentiviral vectors of Let-7c-up and Let-7c-inhibition were constructed and transfected into rat bone marrow mesenchymal stem cells. Optimal multiplicity of infection was screened. The cells were divided into non-transfected group, negative control group (transfected with empty virus), transfected enhancement group (transfected with LV-rno-Let-7c-up), transfected inhibition group (transfected with LV-rno-Let-7c-5p-inhibition). Bone marrow mesenchymal stem cells were treated with fasudil as an inducer for triggering the cells to differentiate into neurons. The fluorescence expressed by transfected cells was observed under inverted fluorescence microscope. The expression of neuron-specific markers, neuron-specific enolase and microtubule-associated protein 2, were measured by immunocytochemical method. The mRNA expression of microtubule-associated protein 2 was detected by RT-PCR. The cell viability was determined by MTT method.
RESULTS AND CONCLUSION: Under the inverted fluorescence microscope, the cells were successfully transfected with LV-rno-Let-7c-up and LV-rno-Let-7c-5p-inhibition. Fasudil induced bone marrow mesenchymal stem cells to differentiate into neurons. The transfection efficiency and expression levels of neuron-specific enolase and microtubule-associated protein 2 in the transfected enhancement group were significantly higher than those in the negative control group (P < 0.05), while in the transfected inhibition group, they were lower than those in the negative control group (P < 0.05). These findings indicate that the differentiation percentage of bone marrow mesenchymal stem cells is increased by fasudil after transfection with LV-rno-Let-7c-up, and Let-7c may promote the differentiation of bone marrow mesenchymal stem cells into neurons. 

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