Control of Mitral/Tufted Cell Output by Selective Inhibition among Olfactory Bulb Glomeruli.

Control of Mitral/Tufted Cell Output by Selective Inhibition among Olfactory Bulb Glomeruli.
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通过在嗅球肾小球中选择性抑制对二尖瓣/簇状细胞输出的控制。

DOI:
10.1016/j.neuron.2016.06.001
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发表时间:
2016-07-20
期刊:
影响因子:
16.2
通讯作者:
Wachowiak M
Wachowiak M
中科院分区:
医学1区
文献类型:
--
作者:
Economo MN;Hansen KR;Wachowiak M

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抑制对于神经回路的信息处理至关重要。在嗅球(OB)中, glomeruli(肾小球,此处指嗅球中的小球)是气味信息编码的功能单位,但glomeruli之间的抑制作用特征尚不明确。我们在麻醉和清醒的小鼠中使用双光子钙成像技术,以观察嗅球输出神经元(僧帽细胞和簇状细胞,MT细胞)中由气味诱发的兴奋和抑制情况。MT细胞的反应极性均匀地映射到离散的嗅球glomeruli上,这使我们能够分析抑制作用相对于glomerular图谱如何塑造嗅球的输出。气味物质仅在可检测到抑制作用的一部分glomeruli中引发独特的抑制模式,并且兴奋的和被抑制的glomeruli在空间上相互交织。二元混合物实验表明,glomeruli间的抑制可抑制僧帽细胞对气味物质的兴奋性反应。这些结果表明,抑制性嗅球回路非线性地转换气味表征,并支持glomerular集合体之间选择性和非随机抑制的模型。
Inhibition is fundamental to information processing by neural circuits. In the olfactory bulb (OB), glomeruli are the functional units for odor information coding, but inhibition among glomeruli is poorly characterized. We used two-photon calcium imaging in anesthetized and awake mice to visualize both odorant-evoked excitation and suppression in OB output neurons (mitral and tufted, MT cells). MT cell response polarity mapped uniformly to discrete OB glomeruli, allowing us to analyze how inhibition shapes OB output relative to the glomerular map. Odorants elicited unique patterns of suppression in only a subset of glomeruli in which such suppression could be detected, and excited and suppressed glomeruli were spatially intermingled. Binary mixture experiments revealed that interglomerular inhibition could suppress excitatory mitral cell responses to odorants. These results reveal that inhibitory OB circuits nonlinearly transform odor representations and support a model of selective and nonrandom inhibition among glomerular ensembles.
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