The keratin-binding protein Albatross regulates polarization of epithelial cells.

The keratin-binding protein Albatross regulates polarization of epithelial cells.
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角蛋白结合蛋白信天翁调节上皮细胞的极化。

DOI:
10.1083/jcb.200803133
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发表时间:
2008-10-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Inagaki M
Inagaki M
中科院分区:
其他
文献类型:
--
作者:
Sugimoto M;Inoko A;Shiromizu T;Nakayama M;Zou P;Yonemura S;Hayashi Y;Izawa I;Sasoh M;Uji Y;Kaibuchi K;Kiyono T;Inagaki M

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角蛋白中间丝网络在上皮细胞中含量丰富,但其在细胞极性建立和维持中的作用尚不清楚。在这里,我们展示了信天翁与Par3的复合体调节顶端连接复合体(AJC)的形成和维持侧膜的一致性。在非极化的上皮细胞中,信天翁定位于角蛋白细丝,而在极化的上皮细胞中,信天翁主要定位于AJC附近。在极化细胞中敲除信天翁会导致AJC的关键成分在细胞-细胞边界消失,并导致角蛋白细丝重组。侧方蛋白E-钙粘附素和桥粒芯糖蛋白2甚至在顶端也有错位分布。虽然信天翁促进了Par3在AJC的定位,但在信天翁击倒细胞中,Par3和Ezrin仍然保留在顶端表面,保留了完整的微绒毛。对角蛋白缺乏的上皮细胞的分析表明,角蛋白需要稳定信天翁蛋白,从而促进AJC的形成。我们认为角蛋白和角蛋白结合蛋白信天翁在上皮细胞极化中起重要作用。
The keratin intermediate filament network is abundant in epithelial cells, but its function in the establishment and maintenance of cell polarity is unclear. Here, we show that Albatross complexes with Par3 to regulate formation of the apical junctional complex (AJC) and maintain lateral membrane identity. In nonpolarized epithelial cells, Albatross localizes with keratin filaments, whereas in polarized epithelial cells, Albatross is primarily localized in the vicinity of the AJC. Knockdown of Albatross in polarized cells causes a disappearance of key components of the AJC at cell–cell borders and keratin filament reorganization. Lateral proteins E-cadherin and desmoglein 2 were mislocalized even on the apical side. Although Albatross promotes localization of Par3 to the AJC, Par3 and ezrin are still retained at the apical surface in Albatross knockdown cells, which retain intact microvilli. Analysis of keratin-deficient epithelial cells revealed that keratins are required to stabilize the Albatross protein, thus promoting the formation of AJC. We propose that keratins and the keratin-binding protein Albatross are important for epithelial cell polarization.
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