华西口腔医学杂志

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机械压力对成骨样细胞增殖活性及功能状态的影响

郑翼 陈国平 周征 罗颂椒   

  1. 610041  四川大学华西口腔医院正畸科
  • 收稿日期:2002-02-25 修回日期:2002-02-25 出版日期:2002-02-20 发布日期:2002-02-20
  • 基金资助:

    本课题为国家自然科学基金资助项目(编号39800145)

Effects of the Mechanical Stress on the Proliferation and Function of Osteoblast-like Cells in vitro

Zheng Yi , Chen Guoping , Zhou Zheng , et al   

  1. College of Stomatology , West China University of Medical Sciences
  • Received:2002-02-25 Revised:2002-02-25 Online:2002-02-20 Published:2002-02-20

摘要:

目的:初步探讨机械压力对成骨样细胞增殖活性及功能状态的影响,为研究正畸矫治力对牙周及骨组织的生长改建的机理提供理论依据。方法:对体外培养的成骨样细胞在受到顶—底轴向压力(225 ×g) 后6、12、18、24、30、36 h ,利用流式细胞术及MTT比色法,检测细胞增殖动力学的变化及线粒体琥珀酸脱氢酶的代谢活性。结果:加力组较对照组各期细胞所占百分比及细胞功能状态都有显著性差异( P < 0101) ,其中以加力后12 h、S 期细胞的增加及功能状态的降低最为明显,而增殖指数增加的最大值出现在加力后18 h ,加力组与对照组各项指标在24 h 后趋于一致;前向散射光参数FSC 两组间无显著性差异。结论:顶—底轴向压力(225 ×g) 可显著影响成骨样细胞的增殖活性和功能状态,并随时间的推移逐渐恢复,未发生病理性损害。

关键词: 机械力, 流式细胞术, MTT, 成骨细胞, 增殖, 代谢

Abstract:

The aim of this study was to investigate the effects of the mechanical stress on the proliferation and function of os2 teoblast-like cells (UMR106) of rats , and further to explore the mechanism of remodeling of periodontium from an angle of me2 chanics. Methods :The flow cytometry and MTTmethod was used to examine the number of osteoblasts-like cells and their prolifer2 ation and metabolic enzymic activity 6 h , 12 h , 18 h , 24 h , 30 h , and 36 h after the top- bottom axial stress (225 ×g) was exert2  ed on the UMR106 in vitro. Results :The difference of cell phase fraction and function between the experimental group and the con2 trol group were of great significance ( P < 0101) . The maximum SPF increasing and functional decreasing appeared 12 h after the appliance of the stress , and all indexes were no significantly different between the two groups 24 h after the stress was supplied. Forward light scatter had no remarkable alteration.Conclusion :The top- bottom axial stress (225 ×g) could inevitably influence the proliferation and function of osteoblast-like cells without pathological damage occurred.

Key words: mechanical stress, flow cytometry, MTT, osteoblast-like cell