Mammalian Fat and Dachsous cadherins regulate apical membrane organization in the embryonic cerebral cortex.

Mammalian Fat and Dachsous cadherins regulate apical membrane organization in the embryonic cerebral cortex.
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DOI:
10.1083/jcb.200811030
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发表时间:
2009-06-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tanoue T
Tanoue T
中科院分区:
其他
文献类型:
--
作者:
Ishiuchi T;Misaki K;Yonemura S;Takeichi M;Tanoue T

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细胞中质膜的区室化是其正常功能的基础。在这项研究中,我们提出的证据表明,哺乳动物Fat 4和Dachsous 1钙粘蛋白调节胚胎大脑皮层的顶端质膜组织。在皮质的神经祖细胞中,Fat 4和Dachsous 1集中在一起,位于比粘附连接(AJ)更顶端的细胞-细胞接触区。这些分子以异嗜性方式相互作用,影响它们各自的蛋白质水平。我们进一步发现,Fat 4与Pals 1复合体相关并共定位。超微结构上,顶端交界处的祖细胞包括AJ和伸展的质膜并置延伸从AJ,其位置对应于Fat 4-Dachsous 1阳性区。Fat 4或Pals 1的消耗消除了这种膜沉积。这些结果突出了Fat 4-Dachsous 1-Pals 1复合物在组织神经祖细胞顶膜结构中的重要性。
Compartmentalization of the plasma membrane in a cell is fundamental for its proper functions. In this study, we present evidence that mammalian Fat4 and Dachsous1 cadherins regulate the apical plasma membrane organization in the embryonic cerebral cortex. In neural progenitor cells of the cortex, Fat4 and Dachsous1 were concentrated together in a cell–cell contact area positioned more apically than the adherens junction (AJ). These molecules interacted in a heterophilic fashion, affecting their respective protein levels. We further found that Fat4 associated and colocalized with the Pals1 complex. Ultrastructurally, the apical junctions of the progenitor cells comprised the AJ and a stretch of plasma membrane apposition extending apically from the AJ, which positionally corresponded to the Fat4–Dachsous1-positive zone. Depletion of Fat4 or Pals1 abolished this membrane apposition. These results highlight the importance of the Fat4–Dachsous1–Pals1 complex in organizing the apical membrane architecture of neural progenitor cells.
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