MIM and cortactin antagonism regulates ciliogenesis and hedgehog signaling.

MIM and cortactin antagonism regulates ciliogenesis and hedgehog signaling.
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DOI:
10.1016/j.devcel.2010.07.009
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发表时间:
2010-08-17
期刊:
影响因子:
11.8
通讯作者:
Oro, Anthony E.
Oro, Anthony E.
中科院分区:
生物学1区
文献类型:
--
作者:
Bershteyn, Marina;Atwood, Scott X.;Woo, Wei-Meng;Li, Mischa;Oro, Anthony E.

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初级纤毛对传导Sonic hedgehog (Shh)信号至关重要,但其瞬时组装的机制尚不清楚。先前我们发现肌动蛋白调控蛋白转移缺失(MIM)调节Shh信号,但MIM的作用性质尚不清楚。本研究表明,间充质细胞基底体需要MIM来维持纤毛、Shh反应和新生毛囊的形成。MIM敲低导致Src激酶活性增加和随后的肌动蛋白调节因子皮质蛋白的过度磷酸化。重要的是,在MIM敲除细胞中,Src的抑制或cortacn的缺失补偿了纤毛缺陷,而Src或磷酸化模拟cortacn的过度表达足以抑制纤毛发生。我们的研究结果表明,MIM通过拮抗src依赖性的皮质蛋白磷酸化来促进纤毛发生,并描述了一种将肌动蛋白细胞骨架调节与纤毛发生和组织再生过程中的Shh信号传导联系起来的机制。
The primary cilium is critical for transducing Sonic hedgehog (Shh) signaling, but the mechanisms of its transient assembly are poorly understood. Previously we showed that the actin regulatory protein Missing-in-Metastasis (MIM) regulates Shh signaling, but the nature of MIM’s role was unknown. Here we show that MIM is required at the basal body of mesenchymal cells for cilia maintenance, Shh responsiveness and de novo hair follicle formation. MIM knockdown results in increased Src kinase activity and subsequent hyperphosphorylation of the actin regulator Cortactin. Importantly, inhibition of Src or depletion of Cortactin compensates for the cilia defect in MIM knockdown cells whereas overexpression of Src or phospho-mimetic Cortactin is sufficient to inhibit ciliogenesis. Our results suggest that MIM promotes ciliogenesis by antagonizing Src-dependent phosphorylation of Cortactin and describe a mechanism linking regulation of the actin cytoskeleton with ciliogenesis and Shh signaling during tissue regeneration.
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