Modeling spinal muscular atrophy in Drosophila links Smn to FGF signaling.

Modeling spinal muscular atrophy in Drosophila links Smn to FGF signaling.
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DOI:
10.1083/jcb.201004016
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发表时间:
2011-02-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Artavanis-Tsakonas S
Artavanis-Tsakonas S
中科院分区:
其他
文献类型:
--
作者:
Sen A;Yokokura T;Kankel MW;Dimlich DN;Manent J;Sanyal S;Artavanis-Tsakonas S

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神经元中的FGF信号是由存活运动神经元调控的,存活运动神经元是调节snRNP生物发生和FGF受体表达的复合物的一个组成部分。脊髓性肌萎缩症(SMA)是一种以运动神经元丧失和肌肉萎缩为特征的破坏性神经退行性疾病,与存活运动神经元(SMN)基因突变有关。基于我们在果蝇中开发的SMA模型,该模型显示出类似于人类病理和脊椎动物SMA模型的特征,我们在功能上将成纤维细胞生长因子(FGF)信号通路与果蝇的SMN同源物联系起来,SMN。在这里,我们描述了这种关系,并证明Smn活性调节FGF信号传导成分的表达,从而调节FGF信号传导。此外,我们发现FGF信号活性的改变能够改变由Smn功能丧失引起的神经肌肉连接缺陷,并且肌肉特异性激活FGF足以挽救Smn相关异常。
FGF signaling in neurons is regulated by Survival Motor Neuron, a component of a complex that regulates snRNP biogenesis and FGF receptor expression. Spinal muscular atrophy (SMA), a devastating neurodegenerative disorder characterized by motor neuron loss and muscle atrophy, has been linked to mutations in the Survival Motor Neuron (SMN) gene. Based on an SMA model we developed in Drosophila, which displays features that are analogous to the human pathology and vertebrate SMA models, we functionally linked the fibroblast growth factor (FGF) signaling pathway to the Drosophila homologue of SMN, Smn. Here, we characterize this relationship and demonstrate that Smn activity regulates the expression of FGF signaling components and thus FGF signaling. Furthermore, we show that alterations in FGF signaling activity are able to modify the neuromuscular junction defects caused by loss of Smn function and that muscle-specific activation of FGF is sufficient to rescue Smn-associated abnormalities.
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