Llgl1 Connects Cell Polarity with Cell-Cell Adhesion in Embryonic Neural Stem Cells.

Llgl1 Connects Cell Polarity with Cell-Cell Adhesion in Embryonic Neural Stem Cells.
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DOI:
10.1016/j.devcel.2017.05.002
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发表时间:
2017-06-05
期刊:
影响因子:
11.8
通讯作者:
Vasioukhin V
Vasioukhin V
中科院分区:
生物学1区
文献类型:
--
作者:
Jossin Y;Lee M;Klezovitch O;Kon E;Cossard A;Lien WH;Fernandez TE;Cooper JA;Vasioukhin V

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大脑皮层畸形(MCC)是一种毁灭性的发育障碍。我们在这里报告,小鼠胚胎神经干细胞特异性缺失Llgl 1(Nestin-Cre/Llgl 1fl/fl),哺乳动物直系同源的果蝇细胞极性基因lgl,表现出MCC类似于严重的脑室周围异位症(PH)。PH形成的免疫组织化学分析和活体皮质成像显示,顶端连接复合物(AJCs)的破坏是Nestin-Cre/Llgl 1fl/fl脑中PH的原因。虽然众所周知,细胞极性蛋白控制AJC的形成,但确切的机制仍不清楚。我们发现LLGL 1直接结合并促进N-钙粘蛋白的内化,并且N-钙粘蛋白/LLGL 1相互作用被aPKC介导的LLGL 1磷酸化抑制,限制了AJCs在基底外侧-顶端边界的积累。破坏N-钙粘蛋白-LLGL 1在体内皮质发育过程中的相互作用是足够的PH。这些研究结果揭示了一种机制,负责在哺乳动物细胞中的细胞极性和细胞-细胞粘附机制之间的物理和功能连接。
Malformations of cerebral cortex (MCC) are devastating developmental disorders. We report here that mice with embryonic neural stem cell-specific deletion of Llgl1 (Nestin-Cre/Llgl1fl/fl), a mammalian ortholog of Drosophila cell polarity gene lgl, exhibit MCC resembling severe periventricular heterotopia (PH). Immunohistochemical analyses and live cortical imaging of PH formation revealed that disruption of apical junctional complexes (AJCs) was responsible for PH in Nestin-Cre/Llgl1fl/fl brains. While it is well known that cell polarity proteins govern the formation of AJCs, the exact mechanisms remain unclear. We show that LLGL1 directly binds to and promotes internalization of N-cadherin, and N-cadherin/LLGL1 interaction is inhibited by aPKC-mediated phosphorylation of LLGL1, restricting the accumulation of AJCs to the basolateral-apical boundary. Disruption of N-cadherin-LLGL1 interaction during cortical development in vivo is sufficient for PH. These findings reveal a mechanism responsible for the physical and functional connection between cell polarity and cell-cell adhesion machineries in mammalian cells.
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