Molecular and Cellular Biochemistry

, Volume 382, Issue 1–2, pp 273–282 | Cite as

Effect of mechanical stretch on the proliferation and differentiation of BMSCs from ovariectomized rats

  • Yuqiong Wu
  • Peng Zhang
  • Qinggang Dai
  • Xiao Yang
  • Runqing Fu
  • Lingyong JiangEmail author
  • Bing FangEmail author


Osteoporosis is characterized by a broken balance between bone formation and bone resorption. Mechanical stress has been considered to be an important factor in bone modeling and remodeling. However, biological responses of stromal cells in osteoporosis to mechanical stimuli remain unknown. To explore the correlation between mechanical stress and osteoblastic differentiation of bone mesenchymal stem cells (BMSCs) in osteoporosis, we built an osteoporosis model in ovariectomized (OVX) rats, and then investigated proliferation, alkaline phosphatase (ALP) activity, and the expression of osteoblastic genes in BMSCs under mechanical stress of 5 and 10 % elongation, using the Flexercell Strain system. The proliferation of BMSCs was detected using alamarBlue. The expression of osteoblastic genes was analyzed by real-time quantitative polymerase chain reaction. Protein expression was examined by Western blotting. BMSCs (OVX) and BMSCs (Sham-operated, Sham in short) proliferations were inhibited at 5 and 10 % elongation at day 3, compared with the un-stretched group, while BMSCs (OVX) proliferation was slower than BMSCs (Sham). ALP activity increased significantly at 10 % elongation in both cells, but it was less active in BMSCs (OVX) than BMSCs (Sham). At days 3 and 7, the mRNA expression of osteoblastic genes was unregulated by mechanical stretch (5 and 10 % elongation); however, osteoblastic gene expression in BMSCs (OVX) was less than that in BMSCs (Sham). The mRNA and protein expression of Runx2 showed similar trends in BMSCs (OVX) under mechanical stretch. These results indicate that the mechanical stretch stimulates osteoblastic differentiation of BMSCs (OVX); however, this differentiation was weaker than that of BMSCs (Sham).


Ovariectomized rats Mechanical stretch BMSCs Runx2 Osteoblastic differentiation 



This work was supported by grants from the National Nature Science Foundation of China (Nos.30901698, 10972142), the Collaborative Foundation of Medical and Engineering Science of Shanghai JiaoTong University (No. YG2012MS40), the Key Basic Research Foundation of the Shanghai Committee of Science and Technology (No. China 12JC1405700), and the “Chen Xing” project from Shanghai Jiaotong University, and also supported by the Innovative Research Team of Shanghai Municipal Education Commission. The authors would like to thank Professor Kerong Dai, Xiaoling Zhang, and Lab of Orthopaedics Cellular and Molecular Biology for generously providing the experimental situation. They also greatly thank Professor Zonglai Jiang and Institute of Mechanobiology and Medical Engineering, Shanghai Jiao Tong University.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Center of Craniofacial Orthodontics, Department of Oral and Cranio-maxillofacial Science, Shanghai Ninth People’s Hospital, Shanghai Key Laboratory of StomatologyShanghai Jiao Tong University School of MedicineShanghaiPeople’s Republic of China

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