The tumour suppressor DLC2 ensures mitotic fidelity by coordinating spindle positioning and cell-cell adhesion.

The tumour suppressor DLC2 ensures mitotic fidelity by coordinating spindle positioning and cell-cell adhesion.
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DOI:
10.1038/ncomms6826
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发表时间:
2014-12-18
影响因子:
16.6
通讯作者:
Matter, Karl
Matter, Karl
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Vitiello, Elisa;Ferreira, Jorge G.;Maiato, Helder;Balda, Maria S.;Matter, Karl

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分裂的上皮细胞需要协调纺锤体的定位和形状的变化,以维持细胞与细胞的粘附。微管与细胞皮层的相互作用调节有丝分裂纺锤体在分裂平面内的定位。纺锤体如何与肌动蛋白细胞骨架相互作用以确保忠实的有丝分裂和纺锤体定位尚不清楚。在这里,我们证明肿瘤抑制因子 DLC2(Cdc42 的负调节因子)和相互作用的驱动蛋白 Kif1B 通过调节微管生长和与肌动蛋白细胞骨架的串扰来协调细胞连接维持和平面纺锤体定位。 DLC2 的缺失会导致 Kif1B 的错误定位、Cdc42 活性增加以及 Cdc42 效应器 mDia3(一种微管稳定剂和肌动蛋白动力学启动子)的皮质募集。因此,DLC2 或 Kif1B 缺失会促进微管稳定、纺锤体定位缺陷、染色体错位和非整倍性。因此,肿瘤抑制因子 DLC2 和 Kif1B 是指导纺锤体定位、细胞间粘附和有丝分裂保真度的信号网络的核心组成部分。 上皮细胞必须正确定位其有丝分裂纺锤体以维持细胞间粘附。这里是维蒂洛等人。结果表明,肿瘤抑制因子 DLC2 和有丝分裂驱动蛋白 Kif1b 协调 mDia3 上游的微管-肌动蛋白相互作用,指导纺锤体定位和有丝分裂保真度。
Dividing epithelial cells need to coordinate spindle positioning with shape changes to maintain cell–cell adhesion. Microtubule interactions with the cell cortex regulate mitotic spindle positioning within the plane of division. How the spindle crosstalks with the actin cytoskeleton to ensure faithful mitosis and spindle positioning is unclear. Here we demonstrate that the tumour suppressor DLC2, a negative regulator of Cdc42, and the interacting kinesin Kif1B coordinate cell junction maintenance and planar spindle positioning by regulating microtubule growth and crosstalk with the actin cytoskeleton. Loss of DLC2 induces the mislocalization of Kif1B, increased Cdc42 activity and cortical recruitment of the Cdc42 effector mDia3, a microtubule stabilizer and promoter of actin dynamics. Accordingly, DLC2 or Kif1B depletion promotes microtubule stabilization, defective spindle positioning, chromosome misalignment and aneuploidy. The tumour suppressor DLC2 and Kif1B are thus central components of a signalling network that guides spindle positioning, cell–cell adhesion and mitotic fidelity. Epithelial cells must position their mitotic spindle correctly to maintain cell–cell adhesion. Here Vitiello et al. show that the tumour suppressor DLC2 and the mitotic kinesin Kif1b coordinate microtubule–actin interactions upstream of mDia3, guiding spindle positioning and mitotic fidelity.
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