シナプス競争におけるニューロンアイデンティティの役割
Narayanan Kasthuri1, Jeff W Lichtman
1Department of Anatomy and Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA.
Nature
|July 25, 2003
まとめ
運動ニューロンのアクソン競争は,筋肉内置を決定する. ニューロンはニューロンです.
科学分野:
- 神経科学は神経科学である.
- 発達生物学 発達生物学とは
- 筋肉の神経化は
背景:
- 哺乳類の筋肉発達の過程で,複数のモーターニューロン軸索の枝が個々の筋肉繊維を共活性化します.
- このプロセスには競争が伴うため,一部の分野は廃止され,他の分野は強化される.
- どの軸索が生き残るか,競争の解決のタイミングを決める正確なメカニズムはまだ不明です.
研究 の 目的:
- 筋肉の発達中のモーターニューロンのアクソン枝の生存と退去を決定する要因を調査する.
- 軸索の競争の結果におけるニューロンのアイデンティティと樹木化の大きさの役割を明らかにする.
主な方法:
- この研究では,発達中の哺乳類の筋肉を内蔵するモーターニューロン軸索の枝間の競争的相互作用を分析した.
- 観察は,ニューロンが複数の標的細胞を共内化するときのアクソン枝の運命に焦点を当てた.
- 植林の規模と競争の成功の関係が検討されました.
主要な成果:
- 軸索の競争の結果は,競合するニューロンのアイデンティティに強く依存しています.
- 単一のニューロンが複数のパートナーと競争するとき,その負けた枝は同様の離脱段階にあります.
- 樹木化が大きいニューロンは,樹木化が小さいニューロンに対して競争上の不利な立場にあり,グローバルな資源が競争に影響することを示唆しています.
結論:
- ニューロンのアイデンティティと軸索の樹木化の相対的な大きさは,モーターニューロン競争の結果の決定的な決定因子です.
- 競争は単に局所的な出来事ではなく,神経構造に関連するグローバルな要因の影響を受けます.
- これらの発見は,発達中の選択的シナプス除去および標的内置のメカニズムについての洞察を提供します.
さらに関連する動画
10:24Electrophysiological and Morphological Characterization of Neuronal Microcircuits in Acute Brain Slices Using Paired Patch-Clamp Recordings
Published on: January 10, 2015
16.8K
05:27Author Spotlight: Investigating the Mechanisms of Neural Circuit Assembly and Synapse Formation in Drosophila
Published on: July 26, 2024
1.0K
関連する概念動画
01:12Synaptic Signaling
69.9K
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.
69.9K
02:47The Synapse
99.8K
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.
99.8K
01:09Synaptic Signaling
5.7K
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...
5.7K
01:19The 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....
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....
3.2K
01:28Integration of Synaptic Events
6.4K
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...
6.4K
01:28Neuronal Communication
5.4K
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...
5.4K