SLK-dependent activation of ERMs controls LGN-NuMA localization and spindle orientation.

SLK-dependent activation of ERMs controls LGN-NuMA localization and spindle orientation.
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DOI:
10.1083/jcb.201401049
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发表时间:
2014-06-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Echard A
Echard A
中科院分区:
其他
文献类型:
--
作者:
Machicoane M;de Frutos CA;Fink J;Rocancourt M;Lombardi Y;Garel S;Piel M;Echard A

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由SLK激酶激活的ERM促进LGN和NuMA有丝分裂皮层的极化缔合,这是适当纺锤体取向的必要步骤。有丝分裂纺锤体的方向依赖于纺锤体微管和细胞皮质之间复杂的对话,其中最近已经牵连到F-肌动蛋白。在这里,我们报告说,膜肌动蛋白连接蛋白埃兹蛋白/radixin/膜突蛋白(ERMs)的强烈和直接激活的Ste 20样激酶在有丝分裂进入哺乳动物细胞。使用微制造的粘合剂基板来控制细胞分裂的轴,我们发现ERMs的激活在引导有丝分裂纺锤体的方向中起着关键作用。因此,在小鼠胚胎新皮层的顶端祖细胞中损害ERM活化严重扰乱了体内纺锤体取向。在分子水平上,ERM激活促进了亮氨酸-甘氨酸-天冬酰胺重复蛋白(LGN)和核有丝分裂器(NuMA)蛋白(纺锤体取向的两个必需因素)在有丝分裂皮层的极化缔合。我们认为,激活的ERMs与Gαi一起,对于LGN-NuMA力发生器复合物的正确定位至关重要,因此对于正确的纺锤体方向至关重要。
ERM activation by SLK kinase promotes polarized association at the mitotic cortex of LGN and NuMA, a necessary step in proper spindle orientation. Mitotic spindle orientation relies on a complex dialog between the spindle microtubules and the cell cortex, in which F-actin has been recently implicated. Here, we report that the membrane–actin linkers ezrin/radixin/moesin (ERMs) are strongly and directly activated by the Ste20-like kinase at mitotic entry in mammalian cells. Using microfabricated adhesive substrates to control the axis of cell division, we found that the activation of ERMs plays a key role in guiding the orientation of the mitotic spindle. Accordingly, impairing ERM activation in apical progenitors of the mouse embryonic neocortex severely disturbed spindle orientation in vivo. At the molecular level, ERM activation promotes the polarized association at the mitotic cortex of leucine-glycine-asparagine repeat protein (LGN) and nuclear mitotic apparatus (NuMA) protein, two essential factors for spindle orientation. We propose that activated ERMs, together with Gαi, are critical for the correct localization of LGN–NuMA force generator complexes and hence for proper spindle orientation.
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