Genetic evidence that SOST inhibits WNT signaling in the limb.

Genetic evidence that SOST inhibits WNT signaling in the limb.
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DOI:
10.1016/j.ydbio.2010.03.021
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发表时间:
2010-06-15
影响因子:
2.7
通讯作者:
Loots, Gabriela G.
Loots, Gabriela G.
中科院分区:
生物学3区
文献类型:
--
作者:
Collette, Nicole M.;Genetos, Damian C.;Murugesh, Deepa;Harland, Richard M.;Loots, Gabriela G.

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SOST是骨形成的负调节因子,人SOST的突变是导致骨质疏松症的原因。除了高骨量外,硬化症患者偶尔会出现手部缺陷,这表明SOST可能在胚胎期起作用。在这里,我们报告说,过度表达SOST导致损失的后结构的zeugopod和autopod的扰动前后和近端远端信号中心在发展中的肢体。过表达SOST与Grem 1和Lrp 6突变组合的突变小鼠显示出比单独的单一突变体更严重的肢体缺陷,而Sost-/-显著挽救了Lrp 6-/-骨骼表型,这表明SOST功能获得性通过抑制WNT通过LRP 5/6的信号传导而损害肢体模式。
SOST is a negative regulator of bone formation and mutations in human SOST are responsible for sclerosteosis. In addition to high bone mass, sclerosteosis patients occasionally display hand defects, suggesting that SOST may function embryonically. Here we report that overexpression of SOST leads to loss of posterior structures of the zeugopod and autopod by perturbing anterior-posterior and proximal-distal signaling centers in the developing limb. Mutant mice that overexpress SOST in combination with Grem1 and Lrp6 mutations display more severe limb defects than single mutants alone, while Sost-/- significantly rescues the Lrp6-/- skeletal phenotype, signifying that SOST gain-of-function impairs limb patterning by inhibition of WNT signaling through LRP5/6.
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