Control of bone formation by the serpentine receptor Frizzled-9.

Control of bone formation by the serpentine receptor Frizzled-9.
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DOI:
10.1083/jcb.201008012
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发表时间:
2011-03-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schinke T
Schinke T
中科院分区:
其他
文献类型:
--
作者:
Albers J;Schulze J;Beil FT;Gebauer M;Baranowsky A;Keller J;Marshall RP;Wintges K;Friedrich FW;Priemel M;Schilling AF;Rueger JM;Cornils K;Fehse B;Streichert T;Sauter G;Jakob F;Insogna KL;Pober B;Knobeloch KP;Francke U;Amling M;Schinke T

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Fzd9在成骨细胞分化过程中被诱导,是初代成骨细胞骨基质矿化所必需的。尽管成骨细胞中的Wnt信号对于骨重塑的调节至关重要,但目前尚不清楚Frizzled家族中哪些特定的Wnt受体在这一过程中具有功能相关性。在本文中,我们发现Fzd9可诱导成骨细胞分化,并且Fzd9−/−小鼠由于骨形成受损而表现出低骨量。我们对Fzd9−/−原代成骨细胞的分析显示,尽管已建立的分化标志物正常表达,但基质矿化存在缺陷。相反,我们观察到趋化因子和干扰素调节基因在Fzd9−/−成骨细胞中的表达降低。我们还发现泛素样修饰物Isg15是这些细胞中Fzd9的一个潜在下游介质。重要的是,我们的分子分析进一步揭示了典型的Wnt信号在缺乏Fzd9的情况下不会受损,从而解释了骨吸收表型的缺乏。总的来说,我们的研究结果揭示了Fzd9在成骨细胞中的一种以前未知的功能,这一发现可能对骨质流失疾病具有治疗意义。
Fzd9, induced upon osteoblast differentiation, is required for bone matrix mineralization in primary osteoblasts. Although Wnt signaling in osteoblasts is of critical importance for the regulation of bone remodeling, it is not yet known which specific Wnt receptors of the Frizzled family are functionally relevant in this process. In this paper, we show that Fzd9 is induced upon osteoblast differentiation and that Fzd9−/− mice display low bone mass caused by impaired bone formation. Our analysis of Fzd9−/− primary osteoblasts demonstrated defects in matrix mineralization in spite of normal expression of established differentiation markers. In contrast, we observed a reduced expression of chemokines and interferon-regulated genes in Fzd9−/− osteoblasts. We also identified the ubiquitin-like modifier Isg15 as one potential downstream mediator of Fzd9 in these cells. Importantly, our molecular analysis further revealed that canonical Wnt signaling is not impaired in the absence of Fzd9, thus explaining the absence of a bone resorption phenotype. Collectively, our results reveal a previously unknown function of Fzd9 in osteoblasts, a finding that may have therapeutic implications for bone loss disorders.
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