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arXiv 1908.05086q-bio.NC
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鱿鱼动作电位的改进Hodgkin & Huxley模型

Improved Hodgkin & Huxley-type model for action potentials in squid

P. J. Stiles, C. G. Gray

摘要:

通过扩展粗Goldman-Hodgkin-Katz电扩散模型的静息态膜电位灌注巨型轴突的鱿鱼,我们重新制定的Hodgkin-Huxley(HH)的现象学定量模型,以创建一个新的模型,这是更简单,更根本上基于电扩散原理。我们的动力学系统,像HH,表现为一个4维谐振器呈现亚阈值振荡。20摄氏度下动作电位传播的预测速度与18.5摄氏度下HH实验值非常一致。外部浓度的钙离子减少后,产生的重复反弹动作电位预测我们的模型,在协议与实验,当膜刺激一个简短的(0.1毫秒)去极化电流。与HH模型不同,我们的模型预测,与实验一致,长时间的恒定电流刺激不会在灌注的轴突中产生脉冲序列。我们的谐振器模型预测了长时间超极化刺激后的反弹尖峰,HH在18.5摄氏度下观察到,但在这个温度下没有预测到。我们的电扩散模型也预测了在室温下短暂超极化促进的尖峰,但仅在低得多的温度下(大约)。6摄氏度)的HH模型。我们讨论定性,更完整地比HH,温度依赖性的各种物理效应,确定休息和动作电位。

英文摘要:

By extending the crude Goldman-Hodgkin-Katz electrodiffusion model for resting-state membrane potentials in perfused giant axons of squid, we reformulate the Hodgkin-Huxley (HH) phenomenological quantitative model to create a new model which is simpler and based more fundamentally on electrodiffusion principles. Our dynamical system, like that of HH, behaves as a 4-dimensional resonator exhibiting subthreshold oscillations. The predicted speed of propagating action potentials at 20 degrees Celsius is in good agreement with the HH experimental value at 18.5 degrees Celsius. After the external concentration of calcium ions is reduced, the generation of repetitive rebound action potentials is predicted by our model, in agreement with experiment, when the membrane is stimulated by a brief (0.1 ms) depolarizing current. Unlike the HH model, our model predicts, in agreement with experiment, that prolonged constant-current stimulation does not generate spike trains in perfused axons. Our resonator model predicts rebound spiking following prolonged hyperpolarizing stimulation, observed at 18.5 degrees Celsius by HH but not predicted at this temperature by their quantitative model. Spiking promoted by brief hyperpolarization is also predicted, at room temperature, by our electrodiffusion model, but only at much lower temperatures (ca. 6 degrees Celsius) by the HH model. We discuss qualitatively, more completely than do HH, temperature dependences of the various physical effects which determine resting and action potentials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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