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首页> 外文期刊>Neuron >Purkinje Cells Directly Inhibit Granule Cells in Specialized Regions of the Cerebellar Cortex
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Purkinje Cells Directly Inhibit Granule Cells in Specialized Regions of the Cerebellar Cortex

机译:Purkinje细胞直接抑制小脑皮层特定区域中的颗粒细胞

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摘要

Inhibition of granule cells plays a key role in gating the flow of signals into the cerebellum, and it is thought that Golgi cells are the only interneurons that inhibit granule cells. Here we show that Purkinje cells, the sole output neurons of the cerebellar cortex, also directly inhibit granule cells via their axon collaterals. Anatomical and optogenetic studies indicate that this non-canonical feedback is region specific: it is most prominent in lobules that regulate eye movement and process vestibular information. Collaterals provide fast, slow, and tonic inhibition to granule cells, and thus allow Purkinje cells to regulate granule cell excitability on multiple timescales. We propose that this feedback mechanism could regulate excitability of the input layer, contribute to sparse coding, and mediate temporal integration.
机译:抑制颗粒细胞在控制进入小脑的信号流中起关键作用,并且据认为高尔基细胞是唯一抑制颗粒细胞的中间神经元。在这里,我们显示小脑皮质的唯一输出神经元浦肯野细胞也通过其轴突侧支直接抑制颗粒细胞。解剖学和光遗传学研究表明,这种非规范性反馈是特定于区域的:在调节眼球运动和处理前庭信息的小叶中最为突出。络合物对颗粒细胞提供快速,缓慢和强直的抑制作用,因此可使浦肯野细胞在多个时间尺度上调节颗粒细胞的兴奋性。我们建议这种反馈机制可以调节输入层的兴奋性,有助于稀疏编码,并介导时间整合。

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