Actomyosin is the main driver of interkinetic nuclear migration in the retina.

Actomyosin is the main driver of interkinetic nuclear migration in the retina.
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DOI:
10.1016/j.cell.2009.06.032
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发表时间:
2009-09-18
期刊:
影响因子:
64.5
通讯作者:
Harris WA
Harris WA
中科院分区:
生物学1区
文献类型:
--
作者:
Norden C;Young S;Link BA;Harris WA

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胚胎脊椎动物中枢神经系统快速扩张的上皮中的祖细胞核经历一个称为互动核迁移(IKNM)的过程。通常认为 IKNM 的运动涉及细胞周期的 G1 和 G2 期期间细胞核分别从顶端到基底以及返回的平滑迁移。然而,这一点尚未得到正式证明,驱动 IKNM 的分子机制也尚未确定。使用延时共聚焦显微镜观察斑马鱼视网膜神经上皮细胞的核运动,我们发现,除了有丝分裂前短暂的顶端核易位外,IKNM 是随机的,而不是平滑和定向的。我们还表明,IKNM 主要是由肌动球蛋白依赖性力驱动的,因为当微管细胞骨架受损时它仍然会发生,但当肌球蛋白 II 活性受到抑制时它会被阻断。
Progenitor cell nuclei in the rapidly expanding epithelium of the embryonic vertebrate central nervous system undergo a process called interkinetic nuclear migration (IKNM). Movements of IKNM are generally believed to involve smooth migration of nuclei from apical to basal and back during the G1 and G2 phases of the cell cycle, respectively. Yet, this has not been formally demonstrated, nor have the molecular mechanisms that drive IKNM been identified. Using time-lapse confocal microscopy to observe nuclear movements in zebrafish retinal neuroepithelial cells, we show that, except for brief apical nuclear translocations preceding mitosis, IKNM is stochastic rather than smooth and directed. We also show that IKNM is driven largely by actomyosin-dependent forces as it still occurs when the microtubule cytoskeleton is compromised but is blocked when MyosinII activity is inhibited.
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