Lrp5 and Lrp6 redundantly control skeletal development in the mouse embryo.

Lrp5 and Lrp6 redundantly control skeletal development in the mouse embryo.
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DOI:
10.1016/j.ydbio.2011.08.020
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发表时间:
2011-11-15
影响因子:
2.7
通讯作者:
Williams BO
Williams BO
中科院分区:
生物学3区
文献类型:
--
作者:
Joeng KS;Schumacher CA;Zylstra-Diegel CR;Long F;Williams BO

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Wnt 信号在胚胎成骨细胞生成中的作用仍有待完全确定。尽管 β-连环蛋白(一种也介导经典 Wnt 信号传导的多功能蛋白)对于胚胎成骨细胞分化是不可或缺的,但关键的 Wnt 辅助受体 Lrp5 和 Lrp6 的作用尚不清楚。事实上,Lrp5 或 Lrp6 的整体缺失并没有明显影响小鼠胚胎中的成骨细胞分化。在这里,我们培育了胚胎间充质中缺乏这两种受体的小鼠,并观察到胚胎中不存在成骨细胞。此外,双缺陷胚胎在zeugopod中发育出多余的软骨元件,揭示了间充质Lrp5/6信号在肢体模式中的重要作用。重要的是,Lrp5/6 突变体的表型与β-连环蛋白缺陷胚胎的表型非常相似。这些表型可能与粘附连接的任何影响无关,因为复合物的另一个成分 α-连环蛋白的缺失不会导致类似的缺陷。因此,Lrp5 和 6 可能通过 β-连环蛋白信号传导冗余地控制胚胎骨骼发育。
The role of Wnt signaling in osteoblastogenesis in the embryo remains to be fully established. Although β-catenin, a multifunctional protein also mediating canonical Wnt signaling, is indispensable for embryonic osteoblast differentiation, the roles of the key Wnt co-receptors Lrp5 and Lrp6 are unclear. Indeed, global deletion of either Lrp5 or Lrp6 did not overtly affect osteoblast differentiation in the mouse embryo. Here, we generated mice lacking both receptors specifically in the embryonic mesenchyme and observed an absence of osteoblasts in the embryo. In addition, the double-deficient embryos developed supernumerary cartilage elements in the zeugopod, revealing an important role for mesenchymal Lrp5/6 signaling in limb patterning. Importantly, the phenotypes of the Lrp5/6 mutant closely resembled those of the β-catenin-deficient embryos. These phenotypes are likely independent of any effect on the adherens junction, as deletion of α-catenin, another component of the complex, did not cause similar defects. Thus, Lrp5 and 6 redundantly control embryonic skeletal development, likely through β-catenin signaling.
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