APC sets the Wnt tone necessary for cerebral cortical progenitor development.

APC sets the Wnt tone necessary for cerebral cortical progenitor development.
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DOI:
10.1101/gad.302679.117
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发表时间:
2017-08-15
影响因子:
10.5
通讯作者:
Anton ES
Anton ES
中科院分区:
生物学1区
文献类型:
--
作者:
Nakagawa N;Li J;Yabuno-Nakagawa K;Eom TY;Cowles M;Mapp T;Taylor R;Anton ES

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Nakagawa等人表明,维持适当的β-连环蛋白介导的Wnt张力对于皮质祖细胞的有序分化和大脑皮质的最终形成是必要的。大肠腺瘤性息肉病(APC)调节β-连环蛋白(Wnt信号传导的组成部分)的活性。然而,APC-β-catenin通路在大脑皮质发育中的选择性作用尚不清楚。在这里,我们从遗传学角度分析了APC调节的β-连环蛋白信号在皮质祖细胞发育中的相对作用,这是大脑皮质形成的一个必要的早期步骤。APC-β-catenin通路的放射状祖细胞特异性失活表明,维持适当的β-catenin介导的Wnt张力对于皮质祖细胞的有序分化和大脑皮质的最终形成是必要的。APC缺失使β-catenin失调,导致高Wnt张力,并破坏Notch 1信号传导和辐射状祖细胞功能所必需的初级纤毛维持。β-连环蛋白失调直接破坏纤毛维持和通过Tulp 3的信号传导,Tulp 3是纤毛信号受体的鞭毛内转运所必需的。令人惊讶的是,APC-无效祖细胞中β-连环蛋白的缺失或β-连环蛋白活性的抑制挽救了APC-无效表型。这些结果表明,APC调节的皮质祖细胞中的β-连环蛋白活性设定了正常大脑皮质发育所需的适当Wnt张力。
Nakagawa et al. show that the maintenance of appropriate β-catenin-mediated Wnt tone is necessary for the orderly differentiation of cortical progenitors and the resultant formation of the cerebral cortex. Adenomatous polyposis coli (APC) regulates the activity of β-catenin, an integral component of Wnt signaling. However, the selective role of the APC–β-catenin pathway in cerebral cortical development is unknown. Here we genetically dissected the relative contributions of APC-regulated β-catenin signaling in cortical progenitor development, a necessary early step in cerebral cortical formation. Radial progenitor-specific inactivation of the APC–β-catenin pathway indicates that the maintenance of appropriate β-catenin-mediated Wnt tone is necessary for the orderly differentiation of cortical progenitors and the resultant formation of the cerebral cortex. APC deletion deregulates β-catenin, leads to high Wnt tone, and disrupts Notch1 signaling and primary cilium maintenance necessary for radial progenitor functions. β-Catenin deregulation directly disrupts cilium maintenance and signaling via Tulp3, essential for intraflagellar transport of ciliary signaling receptors. Surprisingly, deletion of β-catenin or inhibition of β-catenin activity in APC-null progenitors rescues the APC-null phenotype. These results reveal that APC-regulated β-catenin activity in cortical progenitors sets the appropriate Wnt tone necessary for normal cerebral cortical development.
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