Automated tracking of mitotic spindle pole positions shows that LGN is required for spindle rotation but not orientation maintenance.

Automated tracking of mitotic spindle pole positions shows that LGN is required for spindle rotation but not orientation maintenance.
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DOI:
10.4161/cc.25671
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发表时间:
2013-08-15
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Draviam VM
Draviam VM
中科院分区:
其他
文献类型:
--
作者:
Corrigan AM;Shrestha RL;Zulkipli I;Hiroi N;Liu Y;Tamura N;Yang B;Patel J;Funahashi A;Donald A;Draviam VM

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纺锤体方向确定细胞分裂的平面,从而确定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来提取人类上皮细胞系的纺锤体运动,并研究纺锤体如何被带到预定的方向。我们证明纺锤体经历两种不同的运动模式。纺锤体首先主动地朝着细胞的长轴旋转,然后沿着这个预先定义的轴保持。通过量化失去LGN的细胞中的纺锤体运动,我们发现旋转运动的第一种机制需要LGN招募皮质动力蛋白。相比之下,维持纺锤体方向的第二种运动不需要LGN,但对抑制微管动力学的2ME2很敏感。我们的研究首次揭示了人类细胞中纺锤体运动机制的空间定义,并支持了星状微管中LGN和动力蛋白独立皮质锚点的存在。
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.
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