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中华口腔医学研究杂志(电子版) ›› 2011, Vol. 5 ›› Issue (01) : 44 -51. doi: 10.3877/cma.j.issn.1674-1366.2011.01.007

基础研究

抑制细胞骨架改建对流体剪切力作用下成骨细胞增殖与分化影响研究
邵敏锋1, 徐亚娟1, 向映辉1, 李友瑞1, 张艺平1, 陈睿1, 付强1,()   
  1. 1.510055 广州,中山大学光华口腔医学院·附属口腔医院·口腔医学研究所
  • 收稿日期:2010-07-29 出版日期:2011-02-01
  • 通信作者: 付强
  • 基金资助:
    广东省科技计划(2009B050700027)广东省自然科学基金(10151008901000140)

Effects of cytoskeleton reorganization inhibition on the proliferation and differentiation of osteoblasts under fluid shear stress

Min-feng SHAO1, Ya-juan XU1, Ying-hui XIANG1, Yourui LI1, Yi-ping ZHANG1, Rui CHEN1, Qiang FU1,()   

  1. 1.Guanghua School of Stomatology, Institute of Stomatological Research, Sun Yat-sen University, Guangzhou 510055, China
  • Received:2010-07-29 Published:2011-02-01
  • Corresponding author: Qiang FU
引用本文:

邵敏锋, 徐亚娟, 向映辉, 李友瑞, 张艺平, 陈睿, 付强. 抑制细胞骨架改建对流体剪切力作用下成骨细胞增殖与分化影响研究[J/OL]. 中华口腔医学研究杂志(电子版), 2011, 5(01): 44-51.

Min-feng SHAO, Ya-juan XU, Ying-hui XIANG, Yourui LI, Yi-ping ZHANG, Rui CHEN, Qiang FU. Effects of cytoskeleton reorganization inhibition on the proliferation and differentiation of osteoblasts under fluid shear stress[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2011, 5(01): 44-51.

目的

探讨RNA 干扰抑制细胞骨架改建对流体剪切力(FSS)下成骨细胞增殖和分化的影响。

方法

对小鼠颅骨分离的成骨细胞分别给予RNA 干扰、阴性RNA 干扰两种处理后,进行FSS 加载或不加载。 分别应用噻唑蓝(MTT)比色法观测细胞增殖、检测细胞碱性磷酸酶(ALP)活性、采用流式细胞仪检测细胞周期,并进行统计分析。

结果

在无FSS 加载条件下,单纯应用RNA 干扰方法抑制细胞骨架改建,并不能促进成骨细胞的细胞周期中处于S 期的细胞百分比[(3.600±0.447)%与(3.420±0.217)%,t=-0.810,P>0.05]、成骨细胞增殖性能(0.208±0.724 与0.211±0.044,t=0.251,P>0.05)及ALP 活性(0.095 ± 0.001 与0.090 ± 0.020,t=-1.857,P>0.05)增高;FSS 能使成骨细胞的细胞周期中处于S 期的细胞百分比[(11.110 ±3.840)%>(3.420±0.217)%,t=-4.460,P<0.05]、成骨细胞的增殖性能(0.336±0.029 >0.211 ±0.044,t=-13.878,P<0.05)及ALP 的活性(0.110 ± 0.010 >0.090 ± 0.012,t=-7.937,P<0.05)增高;RNA 干扰处理可显著提高FSS 下的细胞周期中处于S 期的细胞百分比[(25.140 ±3.329)% >(3.600±0.447)%,t=-14.339,P<0.05]、成骨细胞增殖性能(0.480±0.953 >0.208±0.724,t=-13.454,P<0.05)及ALP 活性(0.140 ± 0.006 >0.095 ± 0.001,t=-7.384,P<0.05)。抑制细胞骨架改建与FSS 作用两因素对提高成骨细胞的细胞周期中处于S 期的细胞百分比(F=240.125,P<0.05)、成骨细胞增殖性能(F=44.550,P<0.05)及ALP 活性(F=13.798,P<0.05)存在正交互作用。

结论

采用RNA 干扰抑制细胞骨架改建,可以促进FSS 作用下成骨细胞的增殖和分化。

Objective

The study aimed at investigating the effects of cytoskeleton reorganization inhibition with RNA interference (RNAi) on cell proliferation and differentiation of osteoblasts under fluid shear stress (FSS).

Methods

Mouse primary osteoblasts were cultured and treated with or without LIMK2 specific siRNA, and then loaded or unloaded under FSS. MTT assay, alkaline phosphatase (ALP) activity measurement and cell cycle analysis were conducted to evaluate their effects on cell proliferation and differentiation.

Results

Treated with RNAi only, osteoblasts of each group free of FSS showed no significant difference on the percentage of S-phase cells [(3.600±0.447)% and (3.420±0.217)%, t=-0.810, P>0.05], the proliferation viability (0.208 ± 0.724 and 0.211± 0.044, t=0.251, P>0.05) and the ALP activity (0.095 ± 0.001 and 0.090 ± 0.020,t=-1.857,P>0.05). Without effects of RNAi, FSS up-regulated the percentage of S-phase cells [(11.110 ± 3.840)% >(3.420 ± 0.217)%, t=-4.460, P<0.05], the proliferation viability (0.336 ± 0.029 >0.211 ± 0.044, t=-13.878, P<0.05) and the ALP activity (0.110 ±0.010 >0.090±0.012, t=-7.937, P<0.05) of osteoblasts. And after the cytoskeleton reorganization inhibited with RNAi, the percentage of S-phase cells [(25.140 ± 3.329)% >(3.600 ± 0.447)%,t=-14.339, P<0.05], the proliferation viability (0.480 ± 0.953 >0.208 ± 0.724, t=-13.454, P<0.05) and the ALP activity(0.140±0.006 >0.095±0.001, t=-7.384, P<0.05) of cells under FSS had significantly increased. There was a synergistic effect of cytoskeleton reorganization inhibition with RNA interference and fluid shear stress on the percentage of S-phase cells (F=240.125,P<0.05), the proliferation viability (F=44.550, P<0.05), and as well as the ALP activity (F=13.798, P<0.05).

Conclusion

Current findings illustrated that cytoskeleton reorganization inhibition with RNA interference promoted the proliferation and differentiation of osteoblasts under fluid shear stress.

图1 1 ~4 组S 期细胞百分比
图2 组1(NC RNAi 不加载组)流式细胞仪分析成骨细胞的细胞周期分布情况
图3 组2(NC RNAi 加载组)流式细胞仪分析成骨细胞的细胞周期分布情况
图4 组3(RNAi 干扰不加载组)流式细胞仪分析成骨细胞的细胞周期分布情况
图5 组3(RNAi 干扰加载组)流式细胞仪分析成骨细胞的细胞周期分布情况
图6 1 ~4 组成骨细胞增殖功能的吸光度
图7 1 ~4 组碱性磷酸酶活性测定的吸光度
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