SMN is required for sensory-motor circuit function in Drosophila.

SMN is required for sensory-motor circuit function in Drosophila.
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SMN是果蝇中感觉运动电路函数所必需的。

DOI:
10.1016/j.cell.2012.09.011
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发表时间:
2012-10-12
期刊:
影响因子:
64.5
通讯作者:
McCabe BD
McCabe BD
中科院分区:
生物学1区
文献类型:
--
作者:
Imlach WL;Beck ES;Choi BJ;Lotti F;Pellizzoni L;McCabe BD

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脊髓性肌萎缩症(SMA)是一种致命的人类疾病,其特征在于运动神经元功能障碍和肌肉退化,这是由于普遍存在的运动神经元生存(SMN)蛋白的耗尽。果蝇SMN突变体具有减小的肌肉尺寸和缺陷的运动、运动节律和运动神经元神经传递。出乎意料的是,肌肉或运动神经元中SMN的恢复并没有改变这些表型。相反,SMN必须在运动回路中的本体感受神经元和中间神经元中表达,以非自主地纠正运动神经元和肌肉中的缺陷。SMN耗竭破坏了回路发育后的运动系统,并且可以通过运动网络功能的抑制来模仿。此外,通过遗传或药物抑制K+通道来增加运动回路兴奋性可以纠正SMN依赖性表型。这些结果确立了感觉运动回路功能障碍是SMA模型中运动系统缺陷的起源,并表明运动神经网络活动的增强可以改善疾病。
Spinal muscular atrophy (SMA) is a lethal human disease characterized by motor neuron dysfunction and muscle deterioration due to depletion of the ubiquitous Survival Motor Neuron (SMN) protein. Drosophila SMN mutants have reduced muscle size and defective locomotion, motor rhythm and motor neuron neurotransmission. Unexpectedly, restoration of SMN in either muscles or motor neurons did not alter these phenotypes. Instead, SMN must be expressed in proprioceptive neurons and interneurons in the motor circuit to non-autonomously correct defects in motor neurons and muscles. SMN depletion disrupts the motor system subsequent to circuit development and can be mimicked by the inhibition of motor network function. Furthermore, increasing motor circuit excitability by genetic or pharmacological inhibition of K+ channels can correct SMN-dependent phenotypes. These results establish sensory-motor circuit dysfunction as the origin of motor system deficits in this SMA model and suggest that enhancement of motor neural network activity could ameliorate the disease.
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