Lis1 and Ndel1 influence the timing of nuclear envelope breakdown in neural stem cells.

Lis1 and Ndel1 influence the timing of nuclear envelope breakdown in neural stem cells.
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LIS1和NDEL1会影响神经干细胞中核膜分解的时机。

DOI:
10.1083/jcb.200803071
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发表时间:
2008-09-22
影响因子:
7.8
通讯作者:
Smith, Deanna S.
Smith, Deanna S.
中科院分区:
生物学1区
文献类型:
--
作者:
Hebbar, Sachin;Mesngon, Mariano T.;Guillotte, Aimee M.;Desai, Bhavim;Ayala, Ramses;Smith, Deanna S.

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Lis1和Ndel1是动物发育所必需的。它们直接相互作用,并与细胞质动力蛋白相互作用。发育中的大脑对Lis1或Ndel1水平降低特别敏感,因为这两种蛋白质都会影响纺锤体的方向、神经细胞命运的决定和神经元的迁移。我们在此报告,有丝分裂细胞系中的Lis1和Ndel1的减少会损害前期核膜内陷(Pnei)。这种动力蛋白依赖的过程促进去甲肾上腺素的分解(NEBD),并发生在双极纺锤体建立之前。Ndel1的磷酸化对这一功能很重要,它调节与Lis1和Dynein的结合。胚胎13.5d的Lis1+/−小鼠脑室带(VZ)早期细胞数减少,前期/中期细胞比例增加,提示NEBD延迟。此外,VZ的前期细胞在关键的CDK5位点处含有高水平的Ndel1磷酸化。我们的数据表明,VZ中NEBD的延迟可能导致与Lis1-Ndel1中断相关的发育缺陷。
Lis1 and Ndel1 are essential for animal development. They interact directly with one another and with cytoplasmic dynein. The developing brain is especially sensitive to reduced Lis1 or Ndel1 levels, as both proteins influence spindle orientation, neural cell fate decisions, and neuronal migration. We report here that Lis1 and Ndel1 reduction in a mitotic cell line impairs prophase nuclear envelope (NE) invagination (PNEI). This dynein-dependent process facilitates NE breakdown (NEBD) and occurs before the establishment of the bipolar spindle. Ndel1 phosphorylation is important for this function, regulating binding to both Lis1 and dynein. Prophase cells in the ventricular zone (VZ) of embryonic day 13.5 Lis1+/− mouse brains show reduced PNEI, and the ratio of prophase to prometaphase cells is increased, suggesting an NEBD delay. Moreover, prophase cells in the VZ contain elevated levels of Ndel1 phosphorylated at a key cdk5 site. Our data suggest that a delay in NEBD in the VZ could contribute to developmental defects associated with Lis1–Ndel1 disruption.
DOI: 10.1083/jcb.147.2.321
发表时间: 1999-10-18
影响因子: 7.8
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