Regulation of epithelial cell polarity by PAR-3 depends on Girdin transcription and Girdin–Gαi3 signaling

Regulation of epithelial cell polarity by PAR-3 depends on Girdin transcription and Girdin–Gαi3 signaling
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PAR-3 对上皮细胞极性的调节取决于 Girdin 转录和 Girdin-Gαi3 信号传导

DOI:
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发表时间:
2015
影响因子:
4
通讯作者:
S. Ohno
S. Ohno
中科院分区:
生物学2区
文献类型:
--
作者:
K. Sasaki;Taku Kakuwa;K. Akimoto;H. Koga;S. Ohno

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摘要 上皮顶端基底极性在上皮生理学和形态发生中具有重要作用。 PAR 复合物由 PAR-3、PAR-6 和非典型蛋白激酶 C (aPKC) 组成,参与确定各种生物环境(包括上皮细胞)中的细胞极性。然而,尚不完全了解 PAR 复合物如何诱导顶端基底极性。在这项研究中,我们发现PAR-3通过与AP-2转录因子配合在转录水平上调节Girdin(也称为GIV或CCDC88A)的蛋白表达,Girdin是异三聚体Gαi亚基的鸟嘌呤核苷酸交换因子(GEF)。此外,我们证实了 PAR-3 与 Girdin 发生物理相互作用,并表明 Girdin 与 Gαi3(也称为 GNAI3)一起控制 PAR-3 下游的紧密连接形成、顶端结构域发育和肌动蛋白组织。综上所述,我们的研究结果表明,Girdin 表达和 Girdin-Gαi3 信号传导的转录上调在通过 PAR 复合物调节上皮顶端基底极性方面发挥着至关重要的作用。重点文章:Girdin 表达的转录上调和 Girdin-Gαi3 信号传导在通过 PAR 复合物调节上皮顶端基底极性方面发挥着至关重要的作用。
ABSTRACT Epithelial apicobasal polarity has fundamental roles in epithelial physiology and morphogenesis. The PAR complex, comprising PAR-3, PAR-6 and atypical protein kinase C (aPKC), is involved in determining cell polarity in various biological contexts, including in epithelial cells. However, it is not fully understood how the PAR complex induces apicobasal polarity. In this study, we found that PAR-3 regulates the protein expression of Girdin (also known as GIV or CCDC88A), a guanine-nucleotide-exchange factor (GEF) for heterotrimeric Gαi subunits, at the transcriptional level by cooperating with the AP-2 transcription factor. In addition, we confirmed that PAR-3 physically interacts with Girdin, and show that Girdin, together with the Gαi3 (also known as GNAI3), controls tight junction formation, apical domain development and actin organization downstream of PAR-3. Taken together, our findings suggest that transcriptional upregulation of Girdin expression and Girdin–Gαi3 signaling play crucial roles in regulating epithelial apicobasal polarity through the PAR complex. Highlighted Article: Transcriptional upregulation of Girdin expression and Girdin–Gαi3 signaling play crucial roles in regulating epithelial apicobasal polarity through the PAR complex.
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