从原子到神经:一个多尺度模拟框架
Ana Damjanovic1,2,3, Vincenzo Carnevale4,5, Thorsten Hater6
1Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
这项研究引入了一种多规模的模拟方法,将分子动力学和神经元模拟联系起来. 它揭示了离子通道变化如何影响神经元刺激性,有助于神经疾病研究和药物设计.
科学领域:
- 神经科学是一个神经科学.
- 计算生物学 计算生物学
- 生物物理学的生物物理.
背景情况:
- 了解离子通道功能对于阐明神经疾病和设计神经活性药物至关重要.
- 影响神经元刺激性的分子事件是复杂的,需要先进的模拟技术.
研究的目的:
- 开发和验证一个连接分子和神经元模拟的多尺度模拟框架.
- 预测离子通道中的分子变化如何影响膜潜力和神经峰值活动.
- 研究疾病相关变异和脂质膜组成对神经元刺激性的影响.
主要方法:
- 将离子通道的分子动力学模拟 (例如AMPAR,电压关闭的K+/Na+) 与神经网络模拟 (Arbor框架) 的合.
- 使用粗的蒙特卡洛方法进行离子通道封闭模拟.
- 将脂质膜组成和温度作为模拟参数.
- 离子通道状态和膜潜力之间的双向反循环.
主要成果:
- 与疾病相关的AMPAR变体显著改变神经元刺激能力.
- 电压导离子通道模拟与神经元模型相结合,可以准确预测膜电位动力学.
- 脂质膜的组成和温度明显影响神经元刺激性.
- 模拟的膜电位与实验电生理学记录一致.
结论:
- 开发的多尺度框架有效地将原子扰动与神经元刺激性联系起来.
- 这种方法为研究神经疾病和指导神经活性药物发现提供了强大的工具.
- 这项研究强调了脂质环境和温度对神经元功能的显著,但经常被忽视的影响.
相关概念视频
01:14Action Potential
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
01:19The Role of Ion Channels in Neuronal Computation
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.
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.
01:21Neurons: The Axon
Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment.
01:23Propagation of Action Potentials
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
01:28Neuronal Communication
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...