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首页> 外文期刊>Communications in Numerical Methods in Engineering >Electrophysiological models of the human pancreatic δ-cell: From single channels to the firing of action potentials
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Electrophysiological models of the human pancreatic δ-cell: From single channels to the firing of action potentials

机译:人胰腺δ细胞的电生理模型:从单个通道到动作电位的发射

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Minimal mathematical models were developed to describe the electrophysiological properties of human delta-cells. Markov models of single channels were first developed based on the analysis of electrophysiological data. Monte Carlo simulations of voltage-clamp experiments were performed in an iteratively optimization procedure to estimate the number of channels required to reproduce the main characteristics of the macroscopic currents recorded experimentally. A membrane model of the firing of action potentials was then developed based on the kinetic schemes of single channels and the number of channels estimated. We showed that macroscopic currents of human delta-cells can be reproduced by minimal models of single channels when the appropriate number of channels is considered. In addition, our simulations suggest that human delta-cells are capable of generating action potentials through the interaction of the ionic currents involved. Finally, we determined the relative contribution of the currents underlying the firing of action potentials in human pancreatic delta-cells, which allowed us to propose a qualitative model of an action potential in terms of the underlying ionic currents.
机译:建立了最小的数学模型来描述人类δ细胞的电生理特性。基于电生理数据的分析,首先开发了单通道的马尔可夫模型。电压钳制实验的蒙特卡罗模拟是在迭代优化程序中进行的,以估算再现实验记录的宏观电流的主要特征所需的通道数。然后根据单通道的动力学方案和估计的通道数,建立了动作电位触发的膜模型。我们表明,当考虑适当数量的通道时,可以通过单个通道的最小模型来再现人三角洲细胞的宏观电流。另外,我们的模拟表明,人类三角细胞能够通过所涉及的离子电流的相互作用产生动作电位。最后,我们确定了人类胰腺δ细胞中动作电位激发的电流的相对贡献,这使我们能够根据潜在的离子电流提出动作电位的定性模型。

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