Mammalian PAR-1 determines epithelial lumen polarity by organizing the microtubule cytoskeleton.

Mammalian PAR-1 determines epithelial lumen polarity by organizing the microtubule cytoskeleton.
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DOI:
10.1083/jcb.200308104
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发表时间:
2004-03-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Müsch A
Müsch A
中科院分区:
其他
文献类型:
--
作者:
Cohen D;Brennwald PJ;Rodriguez-Boulan E;Müsch A

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上皮分化包括管腔表面和沿极性轴排列的非中心体微管(MT)网络的产生。柱状上皮(如肾、肠和Madin-Darby犬肾[MDCK]细胞)产生顶腔并垂直定向MT,而肝上皮细胞(肝细胞和WIFB9细胞)在细胞-细胞接触部位(胆小管)产生腔并水平定向MT。我们报道,在培养的MDCK和WIFB9细胞极化过程中,敲除或抑制秀丽线虫PAR-1(EMK1和Mark2)的哺乳动物同源物可以阻止其特征管腔和非放射状MT网络的发展。反之,EMK1的过表达诱导MDCK细胞出现细胞间腔和水平MT排列,使EMK1成为第一个已知的调控肝和柱状上皮细胞之间发育分支决定的候选基因。我们的实验表明,EMK1主要促进MT网络的重组,这与该基因产物在其他系统中对MT的调节作用一致,后者反过来控制管腔的形成和位置。
Epithelial differentiation involves the generation of luminal surfaces and of a noncentrosomal microtubule (MT) network aligned along the polarity axis. Columnar epithelia (e.g., kidney, intestine, and Madin-Darby canine kidney [MDCK] cells) generate apical lumina and orient MT vertically, whereas liver epithelial cells (hepatocytes and WIFB9 cells) generate lumina at cell–cell contact sites (bile canaliculi) and orient MTs horizontally. We report that knockdown or inhibition of the mammalian orthologue of Caenorhabditis elegans Par-1 (EMK1 and MARK2) during polarization of cultured MDCK and WIFB9 cells prevented development of their characteristic lumen and nonradial MT networks. Conversely, EMK1 overexpression induced the appearance of intercellular lumina and horizontal MT arrays in MDCK cells, making EMK1 the first known candidate to regulate the developmental branching decision between hepatic and columnar epithelial cells. Our experiments suggest that EMK1 primarily promotes reorganization of the MT network, consistent with the MT-regulating role of this gene product in other systems, which in turn controls lumen formation and position.
WIF-B细胞:用于研究肝细胞极性的体外模型。
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