Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (32): 5113-5117.doi: 10.3969/j.issn.2095-4344.2015.32.006

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miR-155 is conductive to chondrogenic differentiation of bone marrow mesenchymal stem cells

Liu Bo, Wang Xi-ming, Pan Qi, Tian Qi-jun   

  1. Department of Orthopedics, the Fourth People’s Hospital of Jinan City, Jinan 250031, Shandong Province, China
  • Online:2015-08-06 Published:2015-08-06
  • About author:Liu Bo, Attending physician, Department of Orthopedics, the Fourth People’s Hospital of Jinan City, Jinan 250031, Shandong Province, China

Abstract:

BACKGROUND: It is discovered recently that miRNA is a new regulator that is able to have an impact on gene expression and miRNA contributes to proliferation, differentiation and self-renewal of pluripotent stem cells.
OBJECTIVE: To investigate the mechanism by which miR-155 regulates chondrogenic differentiation of bone marrow mesenchymal stem cells.
METHODS: Sixty healthy Sprague-Dawley aged 12 weeks were randomized into study group and control group, with 30 in each group. Under anesthesia, rats were sacrificed to harvest bone marrow of the lower limbs. Then bone marrow mesenchymal stem cells were isolated, cultured, and transfected with miR-155 mimics in the study group and a negative control sequence in the control group. After chondrogenic induction, RT-PCR was used to detect the expressions of Sox9, Collagen II, Aggrecan and Collagen X gene, and western blot assay to detect the expression of Sox9 and Runx2 proteins.
RESULTS AND CONCLUSION: Compared with the control group, the mRNA expressions of Sox9, Collagen II and Aggrecan were higher, but the mRNA expression of Collagen X was lower in the study group (P < 0.05); the protein expression of Sox9 was higher, but the protein expression of Runx2 was lower in the study group (P < 0.05). These findings indicate that miR-155 promotes the chondrogenic differentiation of bone marrow mesenchymal stem cells and moreover, it can suppress the hypertrophy trend of bone marrow mesenchymal stem cells differentiating into chondrocytes. 

 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: Bone Marrow, Mesenchymal Stem Cells, MicroRNAs, Cell Differentiation

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