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首页> 外文期刊>Cell cycle >Automated tracking of mitotic spindle pole positions shows that LGN is required for spindle rotation but not orientation maintenance
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Automated tracking of mitotic spindle pole positions shows that LGN is required for spindle rotation but not orientation maintenance

机译:自动跟踪有丝分裂纺锤体的极点位置表明,纺锤体旋转需要LGN,但不需要方向保持

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摘要

Spindle orientation defines the plane of cell division and, thereby, the spatial position of all daughter cells. Here, we develop a live cell microscopy-based methodology to extract spindle movements in human epithelial cell lines and study how spindles are brought to a pre-defined orientation. We show that spindles undergo two distinct regimes of movements. Spindles are first actively rotated toward the cells' long-axis and then maintained along this pre-defined axis. By quantifying spindle movements in cells depleted of LGN, we show that the first regime of rotational movements requires LGN that recruits cortical dynein. In contrast, the second regime of movements that maintains spindle orientation does not require LGN, but is sensitive to 2ME2 that suppresses microtubule dynamics. Our study sheds first insight into spatially defined spindle movement regimes in human cells, and supports the presence of LGN and dynein independent cortical anchors for astral microtubules.
机译:纺锤定向定义了细胞分裂的平面,从而定义了所有子细胞的空间位置。在这里,我们开发了一种基于活细胞显微镜的方法,以提取人上皮细胞系中的纺锤运动,并研究纺锤如何达到预定的方向。我们显示主轴经历两种不同的运动方式。主轴首先主动朝着单元的长轴旋转,然后沿此预定义的轴保持。通过量化耗竭LGN的细胞中的纺锤运动,我们表明旋转运动的第一个机制要求LGN募集皮质动力蛋白。相反,保持主轴方向的第二种运动方式不需要LGN,但对抑制微管动力学的2ME2敏感。我们的研究首次揭示了人类细胞中空间定义的纺锤体运动机制,并支持了星状微管的LGN和动力蛋白独立皮质锚的存在。

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