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首页> 外文期刊>Neuron >Formation of precise connections in the olfactory bulb occurs in the absence of odorant-evoked neuronal activity.
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Formation of precise connections in the olfactory bulb occurs in the absence of odorant-evoked neuronal activity.

机译:嗅球中精确连接的形成是在没有气味引起的神经元活动的情况下发生的。

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摘要

Olfactory neurons expressing the same odorant receptor converge to a small number of glomeruli in the olfactory bulb. In turn, mitral and tufted cells receive and relay this information to higher cortical regions. In other sensory systems, correlated neuronal activity is thought to refine synaptic connections during development. We asked whether the pattern of connections between olfactory sensory axons and mitral cell dendrites is affected when odor-evoked signaling is eliminated in mice lacking functional olfactory cyclic nucleotide-gated (CNG) channels. We demonstrate that olfactory sensory axons converge normally in the CNG channel mutant background. We further show that the pruning of mitral cell dendrites, although slowed during development, is ultimately unperturbed in mutant animals. Thus, the olfactory CNG channel-and by inference correlated neural activity--is not required for generating synaptic specificity in the olfactory bulb.
机译:表达相同气味受体的嗅觉神经元会在嗅球中汇聚成少量的肾小球。反过来,二尖瓣和簇状细胞接收该信息并将其中继到更高的皮质区域。在其他感觉系统中,相关的神经元活动被认为可以改善发育过程中的突触连接。我们询问在缺少功能性嗅觉环状核苷酸门控(CNG)通道的小鼠中消除了气味诱发的信号传导时,嗅觉感觉轴突与二尖瓣细胞树突之间的连接模式是否受到影响。我们证明,在CNG通道突变体背景下,嗅觉感觉轴突通常会聚。我们进一步表明,二尖瓣细胞树突的修剪,尽管在发育过程中减慢了速度,但最终在突变动物中没有受到干扰。因此,嗅觉CNG通道以及通过推理相关的神经活动不需要在嗅球中产生突触特异性。

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