中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (50): 8056-8061.doi: 10.3969/j.issn.2095-4344.2015.50.004

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

共沉默miR-221-3p/222-3p表达抑制骨髓间充质干细胞增殖及促成软骨分化

闫继红,杨 姝,孙海梅,曹丹丹,张秀英,季凤清,郭 多,吴 波,孙婷怡,周德山   

  1. 首都医科大学基础医学院人体解剖与组织胚胎学系组织胚胎学教研室,北京市 100069
  • 收稿日期:2015-11-04 出版日期:2015-12-03 发布日期:2015-12-03
  • 通讯作者: 周德山,博士,教授,首都医科大学基础医学院人体解剖与组织胚胎学系组织胚胎学教研室,北京市 100069
  • 作者简介:闫继红,女,1967年生,吉林省人,汉族,2005年中国协和医科大学毕业,博士,副教授,主要从事干细胞与组织工程研究。
  • 基金资助:

    国家自然科学基金面上项目(81271728);北京市自然科学基金面上项目(7152023)

Down-regulation of miR-221-3p/222-3p inhibits cell proliferation and promotes chondrogenic differentiation of human bone marrow mesenchymal stem cells

Yan Ji-hong, Yang Shu, Sun Hai-mei, Cao Dan-dan, Zhang Xiu-ying, Ji Feng-qing, Guo Duo, Wu Bo, Sun Ting-yi, Zhou De-shan
  

  1. Department of Histology & Embryology, Faculty of Human Anatomy and Embryology, School of Preclinical Medicine, Capital Medical University, Beijing 100069, China
  • Received:2015-11-04 Online:2015-12-03 Published:2015-12-03
  • Contact: Zhou De-shan, M.D., Professor, Department of Histology & Embryology, Faculty of Human Anatomy and Embryology, School of Preclinical Medicine, Capital Medical University, Beijing 100069, China
  • About author:Yan Ji-hong, M.D., Associate professor, Department of Histology & Embryology, Faculty of Human Anatomy and Embryology, School of Preclinical Medicine, Capital Medical University, Beijing 100069, China
  • Supported by:

    Bone Marrow; Mesenchymal Stem Cells; Cell Differentiation; MicroRNAs; Tissue Engineering
    Funding: the National Natural Science Foundation of China, No. 81271728; the Natural Science Foundation of Beijing, No. 7152023

摘要:

背景:基于干细胞的组织工程技术作为治疗骨关节损伤修复的有效手段,具有广泛的应用前景。研究表明miRNA在调控干细胞向软骨分化过程中具有重要的作用。
目的:探讨共感染慢病毒介导的反义miR-221-3p/222-3p(microRNA-221-3p,microRNA-222-3p)对人骨髓间充质干细胞成软骨分化的作用,为临床软骨损伤修复提供新的策略。
方法:利用miRNA基因芯片技术筛选转化生长因子β3诱导人骨髓间充质干细胞成软骨分化过程中不同阶段表达差异的miRNA,并利用荧光实时定量PCR(RT-qPCR)验证;构建慢病毒人反义miR-221-3p/222-3p载体(Lv-miR-221-3p-inhibition,Lv-miR-222-3p-inhibition)并共转染人骨髓间充质干细胞,空载体组(Lv-GFP)以及未转染组作为对照。利用CCK-8法检测沉默miR-221-3p/222-3p 6 d后细胞的增殖情况;通过番红O染色法、免疫组织化学方法以及RT-PCR验证各组软骨诱导21 d后软骨分化相关标志物的表达。
结果与结论:构建的Lv-miRNA-221-3p/222-3p inhibition 共转染人骨髓间充质干细胞,成功沉默了细胞中的miR-221-3p/222-3p表达水平;miRNA基因芯片与RT-qPCR验证结果显示miR-221-3p/222-3p在软骨分化后期表达明显降低;转染组与未转染组以及空载体组相比:①细胞增殖明显受到抑制。②番红O染色以及免疫组织化学显示软骨分化特征标志物硫酸软骨素以及Ⅱ型胶原表达增强。③RT-qPCR也证实硫酸软骨素以及Ⅱ型胶原的mRNA表达也明显上调。结果显示沉默人骨髓间充质干细胞miRNA-221-3p/222-3p,抑制了细胞增殖并促进了成软骨分化。
 

关键词: 干细胞, 骨髓干细胞, 成软骨分化, miR-221-3p, miR-222-3p, 慢病毒表达载体, 骨髓间充质干细胞, 沉默miRNA, 国家自然科学基金

Abstract:

BACKGROUND: The use of mesenchymal stem cells in the field of tissue engineering for osteoarticular injury repair is a very promising tool since these cells are readily expandable and able to differentiate into chondrocytes. Abundant evidence suggests that microRNAs play critical roles in chondrogenic differentiation of mesenchymal stem cells.
OBJECTIVE: To observe the chondrogenic effect of human bone marrow mesenchymal stem cells transfected with lentiviral vectors bearing miR-221-3p/222-3p inhibition, thereby provding new strategies for cartilage injury.
METHODS: miRNA microarray technology was applied to detect microRNAs expression profiles at three different stages of chondrogenic differentiation induction after transforming growth factor-β3 treatment and verified by 
real-time fluorescence quantitative PCR (RT-qPCR). Human bone marrow mesenchymal stem cells were infected with lentivirus bearing miR-221-3p/222-3p inhibition. After co-suppressing the expression of miR-221/222-3p, cell counting kit-8 was used to determine the cell proliferation, the differentiation of bone marrow mesenchymal stem cells towards chondrocytes was verified by type II collagen protein expression through immunohistochemistry and glycosaminoglycan accumulation was also elevated by sarranine O staining. RT-PCR was used to detect type II collagen and aggrecan mRNA expression at 21 days of chondrogenic induction.
RESULTS AND CONCLUSION: The expression of miR-221-3p/222-3p was inhibited after Lv-miR221-3p/222-3p inhibition co-transfected into bone marrow mesenchymal stem cells. microRNA microarray and RT-qPCR results showed that the expression of miR-221-3p/222-3p was declined significantly at the anaphase of chondrogenic differentiation. The expression levels of chondrogenic markers, Aggrecan and type II collagen were significantly increased in the miR-221-3p/222-3p inhibition group and cell proliferation was also inhibited significantly compared with non-transduced cells or transduced with the empty lentiviral vector group. miR-221-3p/222-3p knockdown in bone marrow mesenchymal stem cells could inhibit proliferation but promote chondrogenic differentiation of bone marrow mesenchymal stem cells.

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

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