华西口腔医学杂志

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Osterix过表达对人牙周膜细胞骨向分化的影响

赵艳红1    李洪发1    王春玲2    杨强3    郑朝1    付雅丽1   

  1. 1.天津医科大学口腔医院正畸科,天津300070;2.山东大学口腔医院正畸科,济南250012;3.天津市天津医院骨科,天津300211
  • 出版日期:2013-04-01 发布日期:2013-04-01
  • 通讯作者: 王春玲,Tel:0531-88382070
  • 作者简介:赵艳红(1979—),女,山东人,讲师,博士
  • 基金资助:

    国家自然科学基金资助项目(31000432);天津医科大学科学基金资助项目(2008ky09)

Effect of Osterix overexpression on osteogenic differentiation of human periodontal ligament cells

Zhao Yanhong1, Li Hongfa1, Wang Chunling2, Yang Qiang3, Zheng Zhao1, Fu Yali1   

  1. 1. Dept. of Orthodontics, Stomatological Hospital of Tianjin Medical University, Tianjin 300070, China; 2. Dept. of Orthodontics, School of Stomatology, Shandong University, Jinan 250012, China; 3. Dept. of Orthopaedics, Tianjin Hospital, Tianjin 300211, China
  • Online:2013-04-01 Published:2013-04-01

摘要:

目的    研究Osterix(Osx)过表达对人牙周膜细胞受力后骨向分化的影响,探讨Osx与正畸牙周组织骨改建的关系。方法    采用组织块法培养人牙周膜细胞,用重组质粒pcDNA3.1 flag- Osx 转染人牙周膜细胞。采用逆转录聚合酶链反应(RT-PCR)和Western blot方法检测未转染组、转染空质粒组、转染Osx组细胞Osx mRNA和蛋白表达水平;并观察核心结合因子α1(Cbfα1)、碱性磷酸酶(ALP)、骨桥素(OPN)、骨钙素(OC)、骨涎蛋白(BSP)和a1(I)型胶原蛋白(Col I)的mRNA表达情况。3组细胞加载6 h离心力后,观察上述检测指标的变化。结果    转染24 h后,相对未转染组,转染空质粒组Osx mRNA和蛋白水平无明显变化(P>0.05);而转染Osx组Osx mRNA和蛋白表达水平明显升高(P<0.01),同时5个成骨标志基因的mRNA表达亦均明显升高(P<0.05,P<0.01)。加力6 h后,3组Osx和成骨标志基因表达水平均明显升高,但是转染Osx组Osx mRNA和蛋白表达增强更加显著,增加量约为其他两组的2倍,其 ALP、OPN、OC、BSP和Col I的mRNA表达亦升高更显著。结论    Osx过表达可以促进人牙周膜细胞在机械力作用下向成骨样细胞分化。Osx可能通过调控多种成骨基因的表达,从而在正畸牙周组织的骨改建过程中发挥着重要的作用。

关键词: Osterix, 过表达, 人牙周膜细胞, 机械刺激, 成骨分化

Abstract:

Objective  To investigate the effects of Osterix (Osx) overexpression on the osteogenic differentiation of human periodontal ligament cells in response to mechanical force. Methods Human periodontal ligament cells were isolated and cultured in vitro with explant method. Cells were transfected with either an Osx expression vector pcDNA3.1 flag-Osx or the mock control vector pcDNA3.1 flag. Then, cells were centrifuged for 6 h. After transfection and cen- trification, the expression of Osx mRNA and protein in untransfected cells, mock-transfected cells and Osx-transfected cells were measured by reverse transcription-polymerase chain reaction (RT-PCR) and Western blot respectively. Furthermore, the changes of mRNA expressions of core-binding factor a1 (Cbfa1), alkaline phosphatase (ALP) , osteopontin (OPN) , osteocalcin (OC) , bone sialoprotein (BSP) and collagen protein a1 (Col I ) genes were measured to assess the differentiation of human periodontal ligament cells. Results  At 24 h after transfection, Osx mRNA and protein level increased significantly in Osx-transfected cells (P<0.01) , while there were no significant difference in Osx mRNA and protein levels between mock-transfected cells and untransfected cells (P>0.05) . Simultaneously, the upregulated mRNA expressions of all the five osteogenic genes were observed (P<0.05, P<0.01) . After 6 h of mechanical stimulation, a significant increase in Osx expression was shown in all three groups. However, compared to mock-transfected and untransfected cells, Osx-transfected cells further showed the highest Osx mRNA and protein expression level. Furthermore, the mRNA expressions of all five osteogenic markers in Osx-transfected cells also exhibited the greater increase and showed the highest levels. Conclusion The overexpression of Osx promotes the mechanical stress-induced osteogenic differentiation of human periodontal ligament cells. Osx may be essential for mechanical stress-induced differentiation of human periodontal ligament cells to osteoblastic-like cells and be involved in orthodontic osteogenic remodeling.

Key words: Osterix, overexpression, human periodontal ligament cells, mechanical stimulation, osteogenic differentiation