パルバルブミンを発現する内部ニューロンにおける軸索の作用力の利用依存的調節
bioRxiv : the preprint server for biology
|February 12, 2026
まとめ
アクソン活性調節は,ニューロンにおいて極めて重要です. 長期にわたる高周波発射は,パルバルブミン発現インターニューロン (PV-INs) の軸索運動ポテンシャル (APs) を変化させ,シナプス伝達とニューロン回路のダイナミクスに影響を与えます.
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.
- 計算神経科学とは
背景:
- アクションポテンシャル (AP) は,従来,軸索に沿って忠実に伝播すると考えられている.
- 最近の証拠は,軸索がニューロン活動と計算を積極的に調節することを示唆しています.
- パルバルブミンを発現する内ニューロン (PV-INs) は,皮質回路機能において重要な役割を果たします.
研究 の 目的:
- 持続的な高周波活動中にPV-INの軸索AP伝播を調査する.
- 長時間のニューロン発火によって軸索APが変化するかどうかを判断する.
- 変異した軸索APがシナプス伝送に及ぼす機能的影響を理解する.
主な方法:
- マウスとヒトの脳断片における,ペアリングされた全細胞体内および軸索結合パッチクランプの記録.
- 生理学的および発作型の活動中のアクソナルAP伝播の評価.
- プレシナプス発作におけるAP波形の変化と関連するカルシウム流入の分析.
主要な成果:
- PV-INにおけるアクソナルAPの伝播は,中程度の周波数での発射でも堅調に留まった.
- 長期にわたる高周波活動は,アクソナルのAP波形における使用依存の変化を誘発したが,体的APは誘発しなかった.
- これらの軸索APの変化は,PV-IN boutonsでのカルシウム流入とシナプス伝播の減少と相関していた.
結論:
- PV-INsの軸索刺激性は,激しい活動中に体刺激性から分離することがあります.
- 使用に依存する軸索APの改変は,高周波発射中のPV-INシナプス出力を制限する可能性があります.
- この現象は,PV-INが活発な脳におけるネットワークダイナミクスへの貢献を著しく形作る可能性がある.
関連する概念動画
Action Potentials
143.2K
Overview
143.2K
Action Potential
4.8K
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...
4.8K
Action Potential
11.4K
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...
11.4K
Propagation of Action Potentials
9.6K
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...
9.6K
Cardiac Action Potential
6.8K
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
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
6.8K
Regulation of Expression Occurs at Multiple Steps
26.5K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
26.5K


