中国组织工程研究 ›› 2013, Vol. 17 ›› Issue (28): 5108-5112.doi: 10.3969/j.issn.2095-4344.2013.28.002

• 骨组织构建 bone tissue construction • 上一篇    下一篇

miR-376b-3p可促进Runx2诱导C2C12细胞进行成骨细胞早期分化

耿倩倩1,余守和1,张 越1, 2,王红梅1,孙奋勇1, 2   

  1. 1暨南大学生物工程研究所,广东省广州市  510632;
    2同济大学附属第十人民医院,上海市   200072
  • 出版日期:2013-07-09 发布日期:2013-07-09
  • 通讯作者: 孙奋勇,博士,博士生导师,同济大学附属第十人民医院,上海市 200072 sunfenyong@263.net
  • 作者简介:耿倩倩,女,1985年生,山东省邹平县人,汉族,硕士,主要从事遗传学方面的研究。 mimiqianqian@126.com
  • 基金资助:

    国家自然科学基金项目(81071524)资助。

miR-376b-3p promotes Runx2-induced early osteogenic differentiation of C2C12 cells

Geng Qian-qian1, Yu Shou-he1, Zhang Yue1, 2, Wang Hong-mei1, Sun Fen-yong1, 2   

  1. 1Institute of Bioengineering, Jinan University, Guangzhou  510632, Guangdong Province, China;
    2Tenth People’s Hospital of Tongji University, Shanghai  200072, China
  • Online:2013-07-09 Published:2013-07-09
  • Contact: Sun Fen-yong, Doctor, Doctoral supervisor, Institute of Bioengineering, Jinan University, Guangzhou, 510632, Guangdong Province, China; Tenth People’s Hospital of Tongji University, Shanghai 200072, China sunfenyong@263.net
  • About author:Geng Qian-qian, Master, Institute of Bioengineering, Jinan University, Guangzhou 510632, Guangdong Province, China mimiqianqian@126.com
  • Supported by:

    the National Natural Science Foundation of China, No. 81071524*

摘要:

背景:转录因子Runx2是调节成骨分化及骨发育的关键因子,过表达Runx2可诱导间质细胞C2C12分化为成骨细胞,但相关诱导分化分子机制并不清楚。   

目的:分析miR-376家族成员在Runx2诱导C2C12细胞进行成骨分化过程中的作用。

方法:利用可诱导表达Runx2的细胞系C2C12/Runx2Dox,在不同的时间点通过荧光定量PCR方法检测miR-376家族成员表达情况。C2C12/Runx2 Dox细胞转染miR-376b-3p mimic后利用荧光定量PCR检测成骨细胞标记基因碱性磷酸酶及骨钙素表达情况,并利用碱性磷酸酶染色法分析碱性磷酸酶活性。利用在线工具miRanda, miRWalk与TargetScan共同预测miR-376b-3p潜在靶基因。利用DAVID Bioinformatics Resources数据库对得到的靶基因进行功能聚类分析。

结果与结论:在Runx2诱导C2C12进行成骨分化过程中miR-376b-3p表达显著增加,其他成员表达无明显变化。转染miR-376b-3p mimic可上调碱性磷酸酶表达,但对骨钙素表达无影响;转染miR-376b-3p mimic也可增加碱性磷酸酶活性。靶基因功能聚类分析结果表明miR-376b-3p可参与机体骨骼发育过程,表明其在成骨分化过程中的作用。研究结果表明,Runx2通过上调miR-376b-3p的方式对与成骨分化相关基因的表达进行调节,以促进C2C12进行成骨细胞的早期分化。

关键词: 组织构建, 骨组织构建, Runx2, C2C12细胞, miR-376b-3p, 成骨分化, 强力霉素, 国家自然科学基金

Abstract:

BACKGROUND: The transcription factor Runx2 is the key factor that regulates osteogenic differention and bone development. It has been reported that the C2C12 mesenchymal cells can be induced to differentiate into osteoblasts by Runx2 overexpression, but the molecular mechanism of induction is still largely unclear.

OBJECTIVE: To investigate the role of the members of the miR-376 family during Runx2-induced osteogenic differentiation in C2C12 cells.

METHODS: The expression of the members of the miR-376 family was detected by real-time quantitative PCR at different time points using C2C12/Runx2Dox sub-line with conditional Runx2 expression. In miR-376b-3p-transfected C2C12/Runx2Dox cells, the expression of osteoblast markers, such as alkaline phosphatase and osteocalcin, was detected by real-time quantitative PCR, and the alkaline phosphatase activity was also examined by alkaline phosphatase staining. The putative miR-376b-3p targets were commonly predicted by online tools (miRanda, miRWalk and TargetScan). The functional classification of these putative targets was performed by DAVID Bioinformatics Resources database.

RESULTS AND CONCLUSION: The expression of miR-376b-3p was significantly increased during Runx2-induced osteogenic differentiation of C2C12 cells, but the expression of other members was not changed. Transfection of miR-376b-3p mimic upregulated alkaline phosphatase expression, but had no effect on osteocalcin expression. The alkaline phosphatase activity was also increased by transfection of miR-376b-3p. The functional classification of miR-376b-3p putative targets showed that miR-376b-3p is involved in the skeleton development, indicating the role of miR-376b-3p in osteoblast differentiation. Taken together, these results suggest that Runx2promotes early osteogenic differentiation in C2C12 cells by regulating the expression of genes related to osteogenic differentiation through upregulation of miR-376b-3p.

Key words: tissue construction, bone tissue construction, Runx2, C2C12 cells, miR-376b-3p, osteogenic differentiation, doxycycline, National Natural Science Foundation of China

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