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树突钙持续内流定位对脊髓运动神经元池输入-输出特性的影响:一项计算研究。

Impact of the localization of dendritic calcium persistent inward current on the input-output properties of spinal motoneuron pool: a computational study.

机构信息

Convergence Research Institute, DGIST, Daegu, Korea

出版信息

J Appl Physiol (1985). 2017 Nov 1;123(5):1166-1187. doi: 10.1152/japplphysiol.00034.2017. Epub 2017 Jul 6.

Abstract

The goal of this study is to investigate how the dendritic Ca-PIC location influences nonlinear input-output properties and depends on the type of motoneurons across the motoneuron pool. A model motoneuron pool consisting of 10 motoneurons was constructed using a recently developed two-compartment modeling approach that reflected key cell type-associated properties experimentally identified. The dendritic excitability and firing output depended systematically on both the PIC location and the motoneuron type. The PIC onset and offset in the current-voltage () relationship tended to occur at more hyperpolarized voltages as the path length to the PIC channels from the soma increased and as the cell type shifted from high- to low-threshold motoneurons. At the same time, the firing acceleration and frequency hysteresis in the frequency-current () relationship became faster and larger, respectively. However, the PIC onset-offset hysteresis increased as the path length and the recruitment threshold increased. Furthermore, the gain of frequency-current function before full PIC activation was larger for PIC channels located over distal dendritic regions in low- compared with high-threshold motoneurons. When compared with previously published experimental observations, the modeling concurred when Ca-PIC channels were placed closer to the soma in high- than low-threshold motoneurons in the model motoneuron pool. All of these results suggest that the negative relationship of Ca-PIC location and cell recruitment threshold may underlie the systematic variation in and transformation across the motoneuron pool. How does the dendritic location of calcium persistent inward current (Ca-PIC) influence dendritic excitability and firing behavior across the spinal motoneuron pool? This issue was investigated developing a model motoneuron pool that reflected key motoneuron type-specific properties experimentally identified. The simulation results point out the negative relationship between the distance of Ca-PIC source from the soma and cell recruitment threshold as a basis underlying the systematic variation in input-output properties of motoneurons over the motoneuron pool.

摘要

本研究旨在探讨树突 Ca-PIC 位置如何影响非线性输入-输出特性,并取决于运动神经元池中运动神经元的类型。使用最近开发的两室建模方法构建了一个模型运动神经元池,该方法反映了从实验中确定的关键细胞类型相关特性。树突兴奋性和放电输出取决于 PIC 位置和运动神经元类型。PIC 在电流-电压(I-V)关系中的起始和结束位置随着从胞体到 PIC 通道的路径长度的增加以及细胞类型从高阈值运动神经元向低阈值运动神经元的转变而趋于更超极化的电压。同时,频率-电流(I-F)关系中的放电加速和频率滞后分别变得更快和更大。然而,随着路径长度和募集阈值的增加,PIC 起始-关闭滞后增加。此外,在完全激活 PIC 之前,位于低阈值运动神经元中远端树突区域的 PIC 通道的频率-电流函数的增益大于高阈值运动神经元。与之前发表的实验观察结果相比,当 Ca-PIC 通道在模型运动神经元池中靠近高阈值运动神经元的胞体时,建模结果与实验结果一致。所有这些结果表明,Ca-PIC 位置和细胞募集阈值之间的负相关关系可能是运动神经元池中的 I-V 和 I-F 转换系统变化的基础。钙持续内向电流 (Ca-PIC) 的树突位置如何影响脊髓运动神经元池中的树突兴奋性和放电行为?本研究通过开发一个反映实验确定的关键运动神经元类型特定特性的模型运动神经元池来研究这个问题。模拟结果指出了 Ca-PIC 源与胞体之间的距离与细胞募集阈值之间的负相关关系是运动神经元池内运动神经元输入-输出特性系统变化的基础。

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