中国组织工程研究 ›› 2014, Vol. 18 ›› Issue (37): 5905-5910.doi: 10.3969/j.issn.2095-4344.2014.37.001

• 骨髓干细胞 bone marrow stem cells •    下一篇

间歇张应力对骨质疏松大鼠骨髓基质干细胞骨向分化中细胞骨架的影响

欧阳宁鹃,傅润卿,张  鹏,吴玉琼,王  洁,江凌勇,房  兵   

  1. 上海交通大学医学院附属第九人民医院口腔颅颌面科;上海市口腔医学重点实验室,上海市  200011
  • 修回日期:2014-08-23 出版日期:2014-09-03 发布日期:2014-09-03
  • 通讯作者: 江凌勇,博士,副教授,上海交通大学医学院附属第九人民医院口腔颅颌面科;上海市口腔医学重点实验室,上海市 200011 并列通讯作者:房兵,博士,教授,上海交通大学医学院附属第九人民医院口腔颅颌面科;上海市口腔医学重点实验室,上海市 200011
  • 作者简介:欧阳宁鹃,女,1990年生,上海市人,汉族,在读硕士,主要从事口腔科方面的研究。
  • 基金资助:

    国家自然科学基金项目(81371121, 11342005, 30901698, 10972142);上海市自然科学基金(13ZR1423700);上海交通大学“医工交叉基金”(YG2012MS40);上海市科委基础研究重点项目(12JC1405700);上海交通大学SMC-晨星青年学者奖励计划优秀青年教师(B类计划);上海市教委创新团队

Effect of intermittent tensile stress on cytoskeleton of bone marrow mesenchymal stem cells during osteogenic differentiation in osteoporosis rats

Ouyang Ning-juan, Fu Run-qing, Zhang Peng, Wu Yu-qiong, Wang Jie, Jiang Ling-yong, Fang Bing   

  1. Department of Crania & Oral Maxillofacial Science, Shanghai Ninth People’s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
  • Revised:2014-08-23 Online:2014-09-03 Published:2014-09-03
  • Contact: Jiang Ling-yong, M.D., Associate professor, Department of Crania & Oral Maxillofacial Science, Shanghai Ninth People’s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China Corresponding author: Fang Bing, M.D., Professor, Department of Crania & Oral Maxillofacial Science, Shanghai Ninth People’s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
  • About author:Ouyang Ning-juan, Studying for master’s degree, Department of Crania & Oral Maxillofacial Science, Shanghai Ninth People’s Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81371121, 11342005, 30901698, 10972142; the Natural Science Foundation of Shanghai, No. 13ZR1423700; Medical and Engineering Crossing Fund of Shanghai Jiao Tong University, No. YG2012MS40; the Basic Research Major Project of Shanghai Science and Technology Commission, No. 12JC1405700; the SMC-Young Scholar Bonus Scheme for Excellent Young Teachers (Class B); the Innovative Team of Shanghai Education Bureau

摘要:

背景:细胞骨架在力学信号的传递中发挥着重要作用,间歇张应力可促进骨髓间充质干细胞的骨向分化,但关于骨质疏松大鼠骨髓间充质干细胞的细胞骨架在间歇张应力作用下骨向分化中的变化尚无相关报道。
目的:探讨间歇性张应力在骨质疏松大鼠骨髓间充质干细胞骨向分化过程中对细胞骨架的影响。
方法:建立大鼠骨质疏松模型,提取骨髓间充质干细胞进行体外培养,用FX-4000T Flexcell对细胞施加不同强度的间歇性张应力(5%,10%,15%),对照组不予施力,碱性磷酸酶染色明确骨向分化情况,激光共聚焦显微镜观察并应用Image ProPlus6.0软件进行分析,测定细胞面积、长宽比及骨架蛋白F-actin的积分荧光强度。
结果与结论:力学作用下,骨质疏松大鼠骨髓间充质干细胞的排列基本垂直于加力方向,所选幅度皆可促进细胞骨向分化,以10%应变组碱性磷酸酶染色最深,15%张应力组细胞排列出现连续性中断。加力后,细胞骨架发生适应性改建,F-actin纤维束平行排列似栅栏状。图像分析显示:间歇性张应力刺激下,骨质疏松大鼠骨髓间充质干细胞面积减小(10%,15%应变组)、长宽比增加(10%,15%应变组)、F-actin表达量增加(5%,10%,15%应变组),与对照组比较差异有显著性意义(P < 0.05)。由此可得,力学刺激下,在骨质疏松大鼠骨髓间充质干细胞骨向分化的过程中,细胞骨架结构发生了相应改建。


中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程


全文链接:

关键词: 干细胞, 骨髓干细胞, 间歇性张应力, 骨髓间充质干细胞, 骨质疏松, 骨向分化, 细胞骨架, 国家自然科学基金

Abstract:

BACKGROUND: Cytoskeleton plays an important role in the transduction of mechanical signal, and intermittent tensile stress can promote osteogenic differentiation. However, there is no relevant study about the change of cytoskeleton in osteoporosis rat bone marrow mesenchymal stem cells under intermittent tensile stress.
OBJECTIVE: To investigate the effects of intermittent tensile stress on the cytoskeleton of osteoporosis rat bone marrow mesenchymal stem cells during osteogenic differentiation. 
METHODS: Bone marrow mesenchymal stem cells were obtained from osteoporosis rats and cultured in vitro. The 5%, 10% and 15% tensile stress were strained on the bone marrow mesenchymal stem cells through FX-4000T Flexcell. No stress was in the control group. Osteogenic differentiation of bone marrow mesenchymal stem cells was observed through alkaline phosphatase staining, while the change of cytoskeleton was observed by confocal laser scanning microscopy with figures collected for analysis by Image-ProPlus 6.0 software. The area of cells, ratio of length to width and integrated fluorescence intensity of cytoskeleton protein F-actin were measured.
RESULTS AND CONCLUSION: Under tensile stress, bone marrow mesenchymal stem cells from osteoporosis rats arranged in the direction vertical to mechanical stimulation. Cells under different tensile stress differentiated towards osteoblasts. The result of alkaline phosphatase staining showed the most significant difference in 10% group, and quite an amount of cells lining lost succession in the 15% group. Under stress, the F-actin filaments were rearranged in parallel accordingly, which showed a reconstruction of cytoskeleton. Imaging analysis indicated that the area of bone marrow mesenchymal stem cells was decreased in 10% and 15% groups (P < 0.05) with the increased ratio of length to width (P < 0.05), and expression of F-actin increased in5%, 10%, 15% groups (P < 0.05) after tensile stress. Under mechanical stimulation, the cytoskeleton of bone marrow mesenchymal stem cells from osteoporosis rats is shown to have corresponding alterations during osteogenic differentiation.


中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程


全文链接:

Key words: bone marrow, mesenchymal stem cells, osteoporosis, stress, mechanical, cytoskeleton

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