関連する実験動画
Updated: Jun 28, 2026
10:52
Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
Published on: April 23, 2019
自調性ニューロン:刺激性シナプスのシナプススケーリング
1Department of Biology, Volen Center for Complex Systems, and National Center for Behavioral Genomics, Brandeis University, Waltham, MA 02454, USA. turrigiano@brandeis.edu
Cell
|November 6, 2008
まとめ
ホメオスタティック・シナプス・スケーリングは,刺激シナプスの強さを調整することによって,ニューロンの発火を安定させます. カルシウムセンサーと並列経路は,この重要な神経プロセスのためのグルタミン酸受容体輸送を調節します.
科学分野:
- 神経科学は神経科学である.
- シナプスの可塑性
- セルラー・シグナリング
背景:
- ホメオスタティック・シナプス・スケーリングは,ニューロンの活動を安定させるための重要なメカニズムです.
- それは,すべての興奮性シナプスの強さをニューロンに調整することを含む.
- このプロセスは,脳のネットワークの安定性を維持するために不可欠です.
研究 の 目的:
- ホメオスタティックシナプススケーリングの基礎となるメカニズムを解明する.
- ニューロンの発火速度の変化を検知するセンサーを特定する.
- 受容体密輸がシナプス強度のスケーリングにどのように寄与するかを理解する.
主な方法:
- カルシウムに依存するシグナル伝達経路の調査.
- グルタミン酸受容体の密輸ダイナミクスの分析.
- 神経活動の感知のための並列経路の探索.
主要な成果:
- ニューロンはカルシウムに依存するセンサーを使用して,発射速度の変化を検出します.
- これらのセンサーは,グルタミン酸受容体のシナプスへの輸送を調節する.
- ネストされたホメオスタティックメカニズムは,様々な時的,空間的なスケールで動作します.
結論:
- ホメオスタティックシナプススケーリングは,カルシウムシグナル伝達と受容体ダイナミクスを含む多面的なプロセスです.
- ニューロンの発火速度の変化は感知され,シナプス強度の調整に変換されます.
- パラレル経路は,神経ホメオスタシスを維持するための複雑でスケーラブルなシステムに寄与します.
関連する概念動画
01:28Integration of Synaptic Events
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
01:09Synaptic Signaling
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
01:12Synaptic Signaling
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
02:47The Synapse
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
01:29Excitatory and Inhibitory Effects of Neurotransmitters
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...
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.