関連する実験動画
Updated: May 10, 2026

11:56
Slice Patch Clamp Technique for Analyzing Learning-Induced Plasticity
Published on: November 11, 2017
分割されたデンドリット性可塑性と,ニューロンにおける入力機能の記憶
Attila Losonczy1, Judit K Makara, Jeffrey C Magee
1Howard Hughes Medical Institute, Janelia Farm Research Campus, 19700 Helix Dr Ashburn, Virginia 20147, USA. losonczya@janelia.hhmi.org
Nature
|March 28, 2008
まとめ
中枢神経系の情報保存には,シナプス性可塑性以上のものが含まれているかもしれません. 研究者らは,ネズミのニューロンにおいて,新しい形の可塑性を発見した.
科学分野:
- 神経科学は神経科学である.
- 細胞神経科学は細胞神経科学である.
- シナプスの可塑性
背景:
- 中枢神経系における情報保存は,伝統的にシナプス性可塑性 (synaptic plasticity) に起因する.
- 膜興奮性の変化などの代替メカニズムも提案されています.
- 局所 dendritic スパイクは,機能検出器として機能する,デンドライトの非線形電圧イベントです.
研究 の 目的:
- 局所 dendritic スパイクの可塑性の存在とメカニズムを調査する.
- デンドリット刺激性の変化がシナプス可塑性とは異なる情報を保存できるかどうかを判断する.
主な方法:
- ネズミのヒポカンパのCA1ピラミッドニューロンを利用した.
- N-メチル-d-アスパラテート受容体 (NMDAR) に依存したKv4.2カリウムチャネルの調節を研究した.
- 枝別特異的な変異が, dendritic spikes と soma の間の結合を研究した.
主要な成果:
- ネズミのヒポカンパニューロンにおける局所 dendritic spikesの枝固有の可塑性を実証した.
- この可塑性は,Kv4.2カリウムチャネルのNMDAR依存の調節によって媒介されていることが示されました.
- 新しい情報保存メカニズムとして"ブランチ強度増強"を特定しました.
結論:
- 局所 dendritic spikeの可塑性は,脳内の情報保存のための新しいメカニズムを提供します.
- このメカニズムである"ブランチ強度増強"は,シナプスインプットの時空相関特性を保存します.
- これは,従来のシナプス効果の変化とは機械的に異なる.
関連する概念動画
Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
The 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.
Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...
Integration 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...
Neural Circuits
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuroplasticity
Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

