Wnts regulate planar cell polarity via heterotrimeric G protein and PI3K signaling.

Wnts regulate planar cell polarity via heterotrimeric G protein and PI3K signaling.
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DOI:
10.1083/jcb.201912071
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发表时间:
2020-10-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Lu X
Lu X
中科院分区:
其他
文献类型:
--
作者:
Landin Malt A;Hogan AK;Smith CD;Madani MS;Lu X

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平面细胞极性(PCP)途径是组织形态发生所必需的。然而,Wnt配体在哺乳动物PCP途径中的作用仍然知之甚少。本研究确定了一个Wnt/异源三聚体G蛋白/PI 3 K途径,调节细胞内在和组织水平的PCP在小鼠耳蜗。在哺乳动物耳蜗中,平面细胞极性(PCP)通路使毛细胞取向沿着感觉上皮的平面排列。同时,多个细胞固有平面极性(称为iPCP)模块介导毛细胞顶端细胞骨架的平面极化,包括动力纤毛和V形毛束必不可少的mechanotransduction。PCP和iPCP在发育过程中如何协调以及Wnt配体在这一过程中的作用仍然没有得到解决。在这里,我们表明,在耳蜗上皮细胞中的Wnt分泌的遗传阻断导致耳蜗导管缩短和定向和畸形的毛束。在机制上,Wnt通过调节Daple(Gαi的鸟嘌呤核苷酸交换因子(GEF))的定位来刺激Gi活性。反过来,Gβγ复合物通过磷酸肌醇3-激酶(PI 3 K)发出信号,调节动纤毛定位和核心PCP蛋白子集的不对称定位,从而协调PCP和iPCP。因此,我们的研究结果确定了一个假定的Wnt/异源三聚体G蛋白/PI 3 K途径PCP的调节。
The planar cell polarity (PCP) pathway is essential for tissue morphogenesis. However, the roles of Wnt ligands in the mammalian PCP pathway remain poorly understood. This study identifies a Wnt/heterotrimeric G protein/PI3K pathway that regulates cell-intrinsic and tissue-level PCP in the mouse cochlea. In the mammalian cochlea, the planar cell polarity (PCP) pathway aligns hair cell orientation along the plane of the sensory epithelium. Concurrently, multiple cell intrinsic planar polarity (referred to as iPCP) modules mediate planar polarization of the hair cell apical cytoskeleton, including the kinocilium and the V-shaped hair bundle essential for mechanotransduction. How PCP and iPCP are coordinated during development and the roles of Wnt ligands in this process remain unresolved. Here we show that genetic blockade of Wnt secretion in the cochlear epithelium resulted in a shortened cochlear duct and misoriented and misshapen hair bundles. Mechanistically, Wnts stimulate Gi activity by regulating the localization of Daple, a guanine nucleotide exchange factor (GEF) for Gαi. In turn, the Gβγ complex signals through phosphoinositide 3-kinase (PI3K) to regulate kinocilium positioning and asymmetric localizations of a subset of core PCP proteins, thereby coordinating PCP and iPCP. Thus, our results identify a putative Wnt/heterotrimeric G protein/PI3K pathway for PCP regulation.
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