FBW7 couples structural integrity with functional output of primary cilia.

FBW7 couples structural integrity with functional output of primary cilia.
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DOI:
10.1038/s42003-021-02504-4
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发表时间:
2021-09-13
影响因子:
5.9
通讯作者:
Tsiokas L
Tsiokas L
中科院分区:
生物学2区
文献类型:
--
作者:
Petsouki E;Gerakopoulos V;Szeto N;Chang W;Humphrey MB;Tsiokas L

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原发性纤毛的结构缺陷在不同组织和系统中具有显著影响。然而,纤毛长度紊乱如何导致功能结果尚不清楚。我们研究了FBW7介导的NDE1降解这一纤毛长度控制机制在间充质干细胞(MSC)分化中的功能作用。我们表明,FBW7作为纤毛发生的负向(NDE1)和正向(TALPID3)调节因子的主要调控因子发挥作用,对原发性纤毛形成、MSC向成骨细胞分化以及骨结构具有总体正向的净效应。Fbxw7的缺失抑制纤毛形成、刺猬蛋白(Hedgehog)活性和分化,而在Fbxw7/Nde1缺失的细胞中这些情况部分得到挽救。我们还表明,尽管NDE1抑制纤毛发生,但它通过直接结合并以不依赖纤毛的方式增强GLI2活性来增加刺猬蛋白通路的活性,从而促进MSC分化。我们提出,FBW7控制着一个将纤毛结构和功能耦合的蛋白质 - 蛋白质相互作用网络,这对干细胞分化至关重要。 佩特苏基(Petsouki)等人剖析了FBW7介导的对间充质干细胞(MSCs)中NDE1和TALPID3的调控的重要性。他们发现,通过调节纤毛负向(NDE1)和正向(TALPID3)调节因子的丰度,FBW7有助于原发性纤毛的组装和信号传导功能,而这些功能对成骨细胞分化是必需的。
Structural defects in primary cilia have robust effects in diverse tissues and systems. However, how disorders of ciliary length lead to functional outcomes are unknown. We examined the functional role of a ciliary length control mechanism of FBW7-mediated destruction of NDE1, in mesenchymal stem cell (MSC) differentiation. We show that FBW7 functions as a master regulator of both negative (NDE1) and positive (TALPID3) regulators of ciliogenesis, with an overall positive net effect on primary cilia formation, MSC differentiation to osteoblasts, and bone architecture. Deletion of Fbxw7 suppresses ciliation, Hedgehog activity, and differentiation, which are partially rescued in Fbxw7/Nde1-null cells. We also show that NDE1, despite suppressing ciliogenesis, promotes MSC differentiation by increasing the activity of the Hedgehog pathway by direct binding and enhancing GLI2 activity in a cilia-independent manner. We propose that FBW7 controls a protein-protein interaction network coupling ciliary structure and function, which is essential for stem cell differentiation. Petsouki et al. dissect the importance of FBW7-mediated regulation of NDE1 and TALPID3 in mesenchymal stem cells (MSCs). They find that by modulating the abundance of negative (NDE1) and positive (TALPID3) cilia regulators, FBW7 contributes to both the assembly and signaling functions of primary cilia that are necessary for osteoblast differentiation.
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