The serine/threonine kinase Par1b regulates epithelial lumen polarity via IRSp53-mediated cell-ECM signaling.

The serine/threonine kinase Par1b regulates epithelial lumen polarity via IRSp53-mediated cell-ECM signaling.
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DOI:
10.1083/jcb.201007002
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发表时间:
2011-02-07
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;Fernandez D;Lázaro-Diéguez F;Müsch A

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Par 1b调节细胞ECM信号传导,并通过靶向IRSp 53(Rho GT3适配器和支架蛋白)来决定上皮内腔组织。丝氨酸/苏氨酸激酶Par 1b促进细胞-细胞粘附并决定上皮细胞中管腔结构域的极性。在这项研究中,我们证明,Par 1b还调节细胞-细胞外基质(ECM)信号在肾脏衍生的Madin-Darby犬肾(MDCK)细胞,并确定了rho-鸟苷三磷酸酶接头和支架蛋白IRSp 53作为参与这一途径的Par 1b基板。Par 1b过表达抑制基底层形成、细胞铺展、粘着斑、应力纤维形成和致密化,而Par 1b缺失具有相反的作用。IRSp 53耗竭模拟Par 1b过表达对细胞-ECM信号传导和管腔极性的影响,但对粘附连接形成没有影响。Par 1b直接磷酸化细胞裂解物中S366上的IRSp 53,并通过间接机制刺激S453/3/5上的磷酸化。Par 1b磷酸化缺陷的IRSp 53突变体而不是野生型蛋白质有效地挽救了Par 1b MDCK细胞中的细胞铺展和腔极性缺陷。我们的数据表明,在一个模型中,Par 1b磷酸化防止招聘IRSp 53效应蛋白的Src同源结构域3,促进14-3-3结合在该域附近。
Par1b regulates cell–ECM signaling and dictates epithelial lumenal organization by targeting IRSp53, a Rho GTPase adaptor and scaffolding protein. The serine/threonine kinase Par1b promotes cell–cell adhesion and determines the polarity of the luminal domain in epithelial cells. In this study, we demonstrate that Par1b also regulates cell–extracellular matrix (ECM) signaling in kidney-derived Madin–Darby canine kidney (MDCK) cells and identified the rho–guanosine triphosphatase adaptor and scaffolding protein IRSp53 as a Par1b substrate involved in this pathway. Par1b overexpression inhibits basal lamina formation, cell spreading, focal adhesion, stress fiber formation, and compaction, whereas Par1b depletion has the opposite effect. IRSp53 depletion mimics Par1b overexpression on cell–ECM signaling and lumen polarity but had no effect on adherens junction formation. Par1b directly phosphorylates IRSp53 on S366 in cell lysates and stimulates phosphorylation on S453/3/5 via an indirect mechanism. A Par1b phosphorylation–deficient IRSp53 mutant but not the wild-type protein efficiently rescues both the cell spreading and the lumen polarity defects in Par1b MDCK cells. Our data suggest a model in which Par1b phosphorylation prevents recruitment of IRSp53 effector proteins to its Src homology domain 3 by promoting 14-3-3 binding in the vicinity of that domain.
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