Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (36): 6423-6429.doi: 10.3969/j.issn.2095-4344.2013.36.007

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In vitro osteogenic differentiation of bone marrow mesenchymal stem cells from ovariectomied osteoporotic rats

Wang Yun, Bao Xiao-ming, Hou Yong-xin, Li Jun, Zhang Min   

  1. Department of Orthopedics, the Second Hospital of Shanxi Medical University, Taiyuan  030001, Shanxi Province, China
  • Received:2013-01-07 Revised:2013-02-19 Online:2013-09-03 Published:2013-09-03
  • Contact: Zhang Min, M.D., Associate professor, Department of Orthopedics, the Second Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China zhangminty@yahoo.com.cn
  • About author:Wang Yun★, Studying for master’s degree, Department of Orthopedics, the Second Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China wangyunff@163.com
  • Supported by:

    Key Science and Technology Project of Shanxi Province, No. 20100311098-2*

Abstract:

BACKGROUND: Cytological studies show that bone marrow mesenchymal stem cells play an important role in postmenopausal osteoporosis mechanism.
OBJECTIVE: To study the osteogenic differentiation in vitro of bone marrow mesenchymal stem cells from ovariectomied osteoporotic rats. 
METHODS: The osteoporotic animal model was established by performing ovariectomy in the 6-month-old female Sprague-Dawley rats. There were four groups: bone marrow mesenchymal stem cells control group, bone marrow mesenchymal stem cells osteoporosis group, bone marrow mesenchymal stem cells osteogenic induction group and oseogenesis induction group. Bone marrow mesenchymal stem cells were isolated from the rats of control group and oseogenesis induction group by means of the whole bone marrow adherence method and cultured to the 3rd generation. Then the bone marrow mesenchymal stem cells were used in all the experiments. Cell morphology was observed under the inverted phase contrast microscope, cell cycle and proliferation index of bone marrow mesenchymal stem cells were detected by flow cytometry. After osteogenic induction, the expression level of alkaline phosphatase was detected, and the fornation of calcium nodes of bone marrow mesenchymal stem cells were marked by alizarin red staining.
RESULTS AND CONCLUSION: The cells in the osteogenic induction group and oseogenesis induction group had the morphology of osteobalsts, and the change of morphology of the cells in the oseogenesis induction group was relatively tardiness. The proliferation index in the control group was higher than that in the osteoporosis group (P < 0.05); expression level of alkaline phosphatase in the osteogenic induction group was significantly higher than that in the oseogenesis induction group (P < 0. 05), and the control group was significantly higher than the oseogenesis group (P < 0.05). The alizarin red staining of the cells in the osteogenic induction group was positive, while negative in the control group and the oseogenesis group; the staining in the osteogenic induction group was stronger than that in the oseogenesis induction group. These findings indicate that both the proliferative potential and the osteogenic potential of bone marrow mesenchymal stem cells from the ovariectomized osteoporotic rats are decreased, which may be related with the ostoeporosis pathogensis of ovariectomied rats.

Key words: stem cells, mesenchymal stem cells, osteoporosis, ovariectomy, alkaline phosphatase

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