Sensitivity analysis of a model of mammalian neural membrane.

Sensitivity analysis of a model of mammalian neural membrane.
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哺乳动物神经膜模型的敏感性分析。

DOI:
10.1007/s004220050455
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发表时间:
1998
影响因子:
1.9
通讯作者:
Grill,WM
Grill,WM
中科院分区:
工程技术3区
文献类型:
--
作者:
McIntyre,CC;Grill,WM

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通过计算机模拟确定强度-持续时间(S-D)关系对描述哺乳动物神经元膜钠通道的参数变化的敏感性。通过并行非线性钠电导、线性漏电导和膜电容对空间夹紧的神经元膜片进行建模。控制钠通道激活 (m) 和失活 (h) 变量的每个参数在其默认值的 -50% 到 +50% 之间变化,并且对于每个变化生成 S-D 关系。十一个参数中的六个(αmA、αmD、αhA、βmA、βmB 和 βhB)的单独变化会导致模型的流变碱电流和时间时间 (Tch) 发生显着变化。单独更改参数值并不能纠正模型在长时间超极化(阳极断裂激励)释放后无法生成激励的问题。将五个参数(αmA、αmB、αhA、βmA 和 βhB)的组合按等量缩放产生的模型可产生阳极断裂激励并增加 Tch,但也降低了动作电位的幅度。为了重现动作电位的幅度,增加了最大钠电导和钠能斯特电位。这些修改生成的模型具有更接近实验结果的 S-D 特性,可以产生阳极断裂激励,并再现动作电位幅度。
The sensitivity of the strength-duration (S-D) relationship to changes in the parameters describing the sodium channel of mammalian neuronal membrane was determined by computer simulation. A space-clamped patch of neuronal membrane was modeled by a parallel nonlinear sodium conductance, linear leakage conductance, and membrane capacitance. Each parameter that governs the activation (m) and inactivation (h) variables of the sodium channel was varied from −50% to +50% of its default value, and for each variation a S-D relationship was generated. Individual changes in six of the eleven parameters (αmA,αmD,αhA,βmA,βmB, andβhB) generated substantial changes in the rheobase current and chronaxie time (Tch) of the model. Changing the parameter values individually did not correct for the model's failure to generate excitation after the release from a long duration hyperpolarization (anode break excitation). Scaling a combination of five parameters (αmA,αmB,αhA,βmA, andβhB) by an equal amount produced a model that generated anode break excitation and increasedTch, but also decreased the amplitude of the action potential. To reproduce the amplitude of the action potential, the maximum sodium conductance and sodium Nernst potential were increased. These modifications generated a model that had S-D properties closer to experimental results, could produce anode break excitation, and reproduced the action potential amplitude.
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