Neuropeptide signaling remodels chemosensory circuit composition in Caenorhabditis elegans.

Neuropeptide signaling remodels chemosensory circuit composition in Caenorhabditis elegans.
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神经肽信号转导秀丽隐杆线虫中的化学感应回路组成。

DOI:
10.1038/nn.3511
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发表时间:
2013-10
影响因子:
25
通讯作者:
Chalasani, Sreekanth H.
Chalasani, Sreekanth H.
中科院分区:
医学1区
文献类型:
--
作者:
Leinwand, Sarah G.;Chalasani, Sreekanth H.

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神经回路检测环境变化并驱动行为。通过密集的神经网络流动的信息途径是动态的。但是,该电路灵活性的基础机制知之甚少。在这里,我们定义了一种新颖的,感官上下文依赖性和神经肽调节的开关。主要的盐探测器ASE感觉神经元使用BLI-4内蛋白依赖性裂解释放胰岛素样肽INS-6,响应外部盐刺激的较大但不小的变化。通过胰岛素受体DAF-2发出信号的胰岛素在功能上将AWC嗅觉感觉神经元转换为盐回路中的中间神经元。胰岛素信号传导中断的动物在盐吸引力方面存在缺陷,这表明肽能信号传导增强了对高盐刺激的反应,这可能会促进离子稳态。我们的结果表明,感觉环境和神经肽信号传导修改神经网络,并提出了通过调节神经电路组成来产生柔性行为输出的一般机制。
Neural circuits detect environmental changes and drive behavior. The routes of information flow through dense neural networks are dynamic; however, the mechanisms underlying this circuit flexibility are poorly understood. Here, we define a novel, sensory context-dependent and neuropeptide-regulated switch in the composition of a C. elegans salt sensory circuit. The primary salt detectors, ASE sensory neurons, use BLI-4 endoprotease-dependent cleavage to release the insulin-like peptide INS-6 in response to large but not small changes in external salt stimuli. Insulins, signaling through the insulin receptor DAF-2, functionally switch the AWC olfactory sensory neuron into an interneuron in the salt circuit. Animals with disrupted insulin signaling have deficits in salt attraction, suggesting that peptidergic signaling potentiates responses to high salt stimuli, which may promote ion homeostasis. Our results show that sensory context and neuropeptide signaling modify neural networks and suggest general mechanisms for generating flexible behavioral outputs by modulating neural circuit composition.
DOI: 10.1093/cercor/bhs270
发表时间: 2014-01
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