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相关概念视频

Cardiac Action Potential01:30

Cardiac Action Potential

1.4K
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

3.2K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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相关实验视频

Updated: Jul 1, 2025

Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology
08:54

Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology

Published on: April 18, 2018

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人类心肌细胞动作潜能建模:探索离子通道输入组合.

Emmanuel Boulay1,2, Eric Troncy1, Vincent Jacquemet3,4,5

  • 1GREPAQ (Groupe de Recherche en Pharmacologie Animale du Québec), Université de Montréal, Saint-Hyacinthe, QC, Canada.

International journal of toxicology
|March 13, 2024
PubMed
概括

在模型可以预测药物对心脏动作潜力持续时间 (APD) 的影响. 延迟整流器通道 (IKr) 显著影响APD,而其他通道如INa和ICa也起着至关重要的作用.

关键词:
这就是CiPA CiPA.奥哈拉鲁迪模型模型行动潜力的持续时间.赫尔格 (hERGG) 是一个在的中.在Torsade de Pointes的位置上

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Human iPSC-Derived Cardiomyocyte Networks on Multiwell Micro-electrode Arrays for Recurrent Action Potential Recordings
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Human iPSC-Derived Cardiomyocyte Networks on Multiwell Micro-electrode Arrays for Recurrent Action Potential Recordings

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In Silico Clinical Trials for Cardiovascular Disease
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相关实验视频

Last Updated: Jul 1, 2025

Creating a Structurally Realistic Finite Element Geometric Model of a Cardiomyocyte to Study the Role of Cellular Architecture in Cardiomyocyte Systems Biology
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Human iPSC-Derived Cardiomyocyte Networks on Multiwell Micro-electrode Arrays for Recurrent Action Potential Recordings
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In Silico Clinical Trials for Cardiovascular Disease
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科学领域:

  • 计算生物学是一种计算生物学.
  • 心血管药理学心血管药理学
  • 药物安全性评估 药物安全性评估

背景情况:

  • 在模型加速药物安全性测试通过模拟电生理相互作用.
  • 奥哈拉-鲁迪模型预测了由于离子通道抑制导致的心脏动作电位持续时间 (APD) 变化.

研究的目的:

  • 评估离子通道抑制组合用于in silico proarrhythmic效应建模.
  • 为了确定个体心脏离子通道对APD变化的贡献.

主要方法:

  • 使用O'Hara-Rudy模型模拟不同程度的离子通道抑制 (30%,60%,90%).
  • 为表心,心肌和内心细胞计算了动作潜力的值.
  • 建模了动作潜力曲线,以分析对APD的影响.

主要成果:

  • 延迟整流器通道 (IKr) 抑制最显著地延长了APD.
  • 快速通道 (INa) 和L型通道 (ICa) 的抑制导致了大量的APD变化.
  • 暂时向外通道 (Ito),向内整流器 (IK1) 和缓慢延迟整流器 (IKs) 显示了最小的APD效应.

结论:

  • 在药理学上,in silico 建模对于预测前节律失常效应具有重要意义.
  • 专注于IKr,INa和ICa对于早期药物开发安全性评估来说已经足够了.
  • 计算模拟可以指导心脏安全测试.