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机构地区:[1]哈尔滨医科大学口腔医学院正畸科,黑龙江哈尔滨150001 [2]第四军医大学口腔医学院正畸科
出 处:《临床口腔医学杂志》2008年第3期133-136,共4页Journal of Clinical Stomatology
基 金:国家自然科学基金资助(30300393);黑龙江省教育厅科学技术研究项目(11521117);哈尔滨医科大学附属第一医院科研基金(2007069)
摘 要:目的:研究不同大小机械牵张力对成骨细胞MMP-13/TIMP-1表达的影响。方法:通过自制的多通道细胞牵张应力加载系统对小鼠成骨样细胞MC3T3-E1同时施加0%、6%、12%和18%的机械牵张力,作用24h后,用RT-PCR方法检测细胞受力后MMP-13/TIMP-1mRNA表达的变化,用免疫印迹法检测其蛋白表达的变化。结果:细胞受力后,MMP-13mRNA/TIMP-1mRNA及蛋白表达随牵张力值的增大明显增加。结论:不同大小机械牵张力可以影响成骨细胞的MMP-13/TIMP-1表达,进而影响骨改建。Objective: To investigate the effects of different magnitudes of mechanical strain on expression of matrix metalloproteinase-13 (MMP-13) / tissue inhibitors of metalloproteinase-1 (TIMP-1) in MC3T3-E1 osteoblastic cells in vitro. Method: MC3T3-E1 cells were subjected to 0%, 6%, 12% or 18% elongation by using multi-passage cell stress loading system simultaneously for 24 h.Then MMP-13 / TIMP-1 mRNA and protein expression in MC3T3-E1 cells were detected by reverse transcription polymerase chain reaction (RT-PCR) and Western blotting, respectively. Result: The expression of MMP-13/TIMP-1 in MC3T3-E1 cells significantly increased in groups under strain (6%, 12%, 18% elongation) in magnitude-dependent manner compared to control (0%) after mechanical strain treatment for 24 h.Condusion: These results indicate that different magnitudes of mechanical strain can affect expression of MMP-13 / TIMP-1 in MC3T3-E1 cells in magnitude-dependent manner, which profoundly affect bone remodeling.
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