Inhibitors of endocytosis prevent Wnt/Wingless signalling by reducing the level of basal β-catenin/Armadillo.

Inhibitors of endocytosis prevent Wnt/Wingless signalling by reducing the level of basal β-catenin/Armadillo.
复制标题

DOI:
10.1242/jcs.155424
复制
发表时间:
2014-11-15
影响因子:
4
通讯作者:
Vincent JP
Vincent JP
中科院分区:
生物学2区
文献类型:
--
作者:
Gagliardi M;Hernandez A;McGough IJ;Vincent JP

文献摘要

参考文献

被引文献

相似文献

经典Wnt信号通路中的关键步骤是抑制GSK 3 β,这导致核β-连环蛋白(也称为CTNNB 1)的积累,从而调节靶基因。有证据表明内吞作用是信号传导所必需的,但其作用和分子理解仍不清楚。最近的一个有争议的模型表明,内吞作用通过引起配体-受体复合物(包括LRP 6和GSK 3)螯合到多泡体(MVB),从而阻止GSK 3 β接近β-连环蛋白,从而促进Wnt信号传导。在这里,我们使用特定的抑制剂(Dynasore和Dyngo-4a),以确认在人类和果蝇细胞中的Wnt/Wingless信号转导的内吞作用的重要作用。然而,我们没有发现任何证据表明,在果蝇细胞或翼成虫盘,LRP 6/箭头交通MVBs或MVBs所需的Wnt/Wingless信号。此外,我们发现通过化学阻断GSK 3 β的信号传导的激活被内吞抑制剂阻止,表明内吞作用影响配体-受体复合物下游的Wnt/Wingless信号传导。我们认为,通过一种未知的机制,内吞作用增加了GSK 3 β通常作用的β-连环蛋白的静息池。
A key step in the canonical Wnt signalling pathway is the inhibition of GSK3β, which results in the accumulation of nuclear β-catenin (also known as CTNNB1), and hence regulation of target genes. Evidence suggests that endocytosis is required for signalling, yet its role and the molecular understanding remains unclear. A recent and controversial model suggests that endocytosis contributes to Wnt signalling by causing the sequestration of the ligand–receptor complex, including LRP6 and GSK3 to multivesicular bodies (MVBs), thus preventing GSK3β from accessing β-catenin. Here, we use specific inhibitors (Dynasore and Dyngo-4a) to confirm the essential role of endocytosis in Wnt/Wingless signalling in human and Drosophila cells. However, we find no evidence that, in Drosophila cells or wing imaginal discs, LRP6/Arrow traffics to MVBs or that MVBs are required for Wnt/Wingless signalling. Moreover, we show that activation of signalling through chemical blockade of GSK3β is prevented by endocytosis inhibitors, suggesting that endocytosis impacts on Wnt/Wingless signalling downstream of the ligand–receptor complex. We propose that, through an unknown mechanism, endocytosis boosts the resting pool of β-catenin upon which GSK3β normally acts.
DOI: 10.3410/b1-59
发表时间: 2009-08-17
期刊: F1000 biology reports
影响因子: --
作者:
Constam DB
通讯作者: Constam DB
DOI: 10.1038/sj.emboj.7601981
发表时间: 2008-02-06
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Katanaev, Vladimir L.;Solis, Gonzalo P.;Hausmann, George;Buestorf, Silke;Katanayeva, Natalya;Schrock, Yvonne;Stuermer, Claudia A. O.;Basler, Konrad
通讯作者: Basler, Konrad
DOI: 10.1016/j.devcel.2006.04.002
发表时间: 2006-06-01
期刊: DEVELOPMENTAL CELL
影响因子: 11.8
作者:
Macia, Eric;Ehrlich, Marcelo;Kirchhausen, Tomas
通讯作者: Kirchhausen, Tomas
DOI: 10.1016/s1074-5521(00)00025-9
发表时间: 2000-10-01
影响因子: --
作者:
Coghlan, MP;Culbert, AA;Holder, JC
通讯作者: Holder, JC
DOI: 10.1242/dev.02338
发表时间: 2006-05-01
期刊: DEVELOPMENT
影响因子: 4.6
作者:
Jafar-Nejad, H;Tien, AC;Bellen, HJ
通讯作者: Bellen, HJ