Voltage-gated sodium currents in cerebellar Purkinje neurons: functional and molecular diversity.

Voltage-gated sodium currents in cerebellar Purkinje neurons: functional and molecular diversity.
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DOI:
10.1007/s00018-018-2868-y
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发表时间:
2018-10
期刊:
Cellular and molecular life sciences : CMLS
影响因子:
--
通讯作者:
Nerbonne JM
Nerbonne JM
中科院分区:
其他
文献类型:
--
作者:
Ransdell JL;Nerbonne JM

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浦肯野神经元是小脑皮质的唯一输出,它将GABA介导的抑制传递到小脑深层核团。为了支持这一关键功能,浦肯野神经元重复和高频放电,这些特征与表达的电压门控钠(NAV)通道的独特属性有关。除了存在于许多类型的中枢和外周神经元中的NAV电流的快速激活和失活(INAT)或瞬时分量(INAT)外,浦肯野神经元还表达持续(INAP)和复发性(INAR)NAV电流。在详细研究这些离散的NAV电流分量的生物物理性质和确定其分子决定因素,以及确定它们在调节浦肯野神经元兴奋性中的作用方面,已经取得了相当大的进展。在这里,我们回顾了这项重要的工作,并强调了关于控制浦肯野神经元NAV电流表达和功能的分子机制的剩余问题。我们还讨论了NAV电流的动态调节对单个浦肯野神经元和小脑回路功能的影响。
Purkinje neurons, the sole output of the cerebellar cortex, deliver GABA-mediated inhibition to the deep cerebellar nuclei. To subserve this critical function, Purkinje neurons fire repetitively and at high frequencies, features that have been linked to the unique properties of the voltage-gated sodium (Nav) channels expressed. In addition to the rapidly activating and inactivating, or transient, component of the Nav current (INaT) present in many types of central and peripheral neurons, Purkinje neurons also express persistent (INaP) and resurgent (INaR) Nav currents. Considerable progress has been made in detailing the biophysical properties and identifying the molecular determinants of these discrete Nav current components, as well as defining their roles in the regulation of Purkinje neuron excitability. Here we review this important work and highlight remaining questions about the molecular mechanisms controlling the expression and the functioning of Nav currents in Purkinje neurons. We also discuss the impact of the dynamic regulation of Nav currents on the functioning of individual Purkinje neurons and cerebellar circuits.
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