中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (1): 87-92.doi: 10.3969/j.issn.2095-4344.1875

• 干细胞基础实验 basic experiments of stem cells • 上一篇    下一篇

ANLN缺失后Hela细胞的力学特性与骨架蛋白变化分析

徐丽萌,罗文宇,张书伟,王  立   

  1. 太原理工大学生物医学工程学院,山西省太原市  030024
  • 收稿日期:2019-03-06 修回日期:2019-03-15 接受日期:2019-04-15 出版日期:2020-01-08 发布日期:2019-12-12
  • 通讯作者: 王立,博士,讲师,太原理工大学生物医学工程学院,山西省太原市 030024
  • 作者简介:徐丽萌,女,1993年生,河北省平乡县人,汉族,太原理工大学在读硕士,主要从事细胞力学方面的研究。
  • 基金资助:
    国家自然科学基金(青年)(31300771)

Mechanical properties and cytoskeletal protein changes after ANLN deficiency

Xu Limeng, Luo Wenyu, Zhang Shuwei, Wang Li   

  1. College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, China
  • Received:2019-03-06 Revised:2019-03-15 Accepted:2019-04-15 Online:2020-01-08 Published:2019-12-12
  • Contact: Wang Li, MD, Lecturer, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, China
  • About author:Xu Limeng, Master candidate, College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, China
  • Supported by:
    the National Natural Science Foundation of China (Youth Program), No. 31300771

摘要:

文题释义:

Anillin蛋白(ANLN):最早是以F-actin的绑定蛋白被发现的,后经研究表明其与细胞骨架的肌动蛋白纤维和肌球蛋白等主要组分相互作用,是一种高度保守的脚手架蛋白,在胞质分裂中稳定收缩环。在细胞分裂间期中维持正常的细胞-细胞连接和细胞形态。

原子力显微镜:利用探针与测量样本之间的各种相互作用力,再通过激光束反射放大微悬臂形变的信号,能够以极高分辨率(纳米级)检测样本表面并成像,同时可对样本进行力学性能测试,获得样本表面特定点的力-距离曲线,再通过对曲线分析获得精确的力学特性,是近期运用最为广泛的工具之一。

背景:目前关于ANLN蛋白在细胞分裂间期调节细胞形态、细胞-细胞间接完整性以及胞质分裂中稳定收缩环的作用已经明确,但其对细胞力学性能和骨架蛋白的影响还鲜有报道。

目的:探讨ANLN缺失对分裂间期细胞力学特性与骨架蛋白的影响。

方法:通过原子力显微镜分别测量正常Hela细胞与siRNA敲降ANLN的Hela细胞的表面弹性模量和破膜力;采用激光共聚焦显微镜观察正常Hela细胞与siRNA敲降ANLN的Hela细胞的肌球蛋白ⅡA以及肌动蛋白纤维分布特征。

结果与结论:①敲降ANLN的Hela细胞的表面弹性模量明显高于未经处理的正常Hela细胞,与敲降ANLN的细胞相比,正常细胞的表面弹性模量更倾向于极性分布(两极间逐步降低),但两组细胞长轴边缘区域的破膜力并没有明显差别;②ANLN敲降组细胞在边缘位置有较低的肌球蛋白ⅡA分布;③ANLN敲降组近底层细胞-细胞连接区域的肌动蛋白纤维趋向更散乱,并且细胞内纤维束沿长轴排列不明显,中层有细胞间隙变大的倾向;④结果说明,敲降ANLN对细胞的边缘区域影响最大,ANLN的缺失会导致细胞边缘区域更频繁的重构,细胞需要聚集更多的骨架蛋白及其结合蛋白来稳定细胞状态,导致了更高的表面弹性模量。

ORCID: 0000-0002-3501-4467(徐丽萌)

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

关键词: ANLN蛋白, 细胞铺展, 原子力显微镜, 力曲线, 表面弹性模量, 破膜力, 细胞骨架, 肌动蛋白纤维, 国家自然科学基金

Abstract:

BACKGROUND: To date, ANLN has definite roles in altering cell shape, regulating cell-cell junction integrity in interphase and stabilizing actomyosin contractile rings in cytokinesis, but its effects on cell mechanical properties and on cytoskeletal proteins have rarely been reported.

OBJECTIVE: To investigate the effect of ANLN deletion on the mechanical properties and cytoskeleton of interphase Hela cells.

METHODS: Surface elastic modulus and membrane rupture force of normal untreated Hela cells and ANLN RNA stably knocked down Hela cells were measured by atomic force microscopy. We screened for the cells that stably expressed mCherry-Myosin II A, and observed the distribution characteristics of cytoskeletal proteins by laser scanning confocal microscopy.

RESULTS AND CONCLUSION: (1) The elastic modulus of Hela cells with ANLN stably knocked down was significantly higher than that of normal Hela cells, and the elastic modulus of normal cells were more prone to polar distribution (gradually decreasing between the two poles) than that of ANLN knockdown Hela cells. However, there was no significant difference in the membrane rupture force at the long-axis edge region between the two groups. (2) Myosin IIA lowly expressed in the marginal region of ANLN knockdown cells. (3) The actin fibers tended to be scattered in the near-bottom cell-cell junction region of the ANLN knockdown group, and there were no obvious intracellular fibers bundles arranging along the long axis. The cell gap tended to enlarge in the middle layer. To conclude, ANLN knockdown cells have the greatest impact in the marginal region, the deficiency of ANLN leads to a more frequent remodeling in the cell marginal region, and the cells need to accumulate more cytoskeletal proteins and binding proteins to stabilize the cell state, resulting in higher modulus of elastics.

Key words: ANLN protein, cell spreading, atomic force microscopy, force curve, surface elastic modulus, membrane rupture force, cytoskeleton, actin fiber, National Natural Science Foundation of China

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