髪の細胞のシナプスリボンは,同期的な聴覚信号伝達に不可欠です
Darina Khimich1, Régis Nouvian, Rémy Pujol
1Department of Otolaryngology and Center for Molecular Physiology of the Brain, University of Goettingen, 37099 Goettingen, Germany.
Nature
|April 15, 2005
まとめ
プレシナプティック・ベサウンタンパク質は,聴覚信号伝達に不可欠な内部毛細胞 (IHC) のシナプスリボンに固定されます. リボンアンカリングの障害は,正常な聴覚に不可欠な膀の放出と同期神経活性化を妨げます.
科学分野:
- 神経科学は神経科学である.
- 監査システムの研究
- 細胞生物学 細胞生物学
背景:
- 聴覚信号は,内毛細胞 (IHC) リボンシナプスにおけるシナプス伝達に依存する.
- IHCにおけるプレシナプスリボンズの正確な機能は,ほとんど未定のままである.
研究 の 目的:
- IHCにおけるシナプスリボン固定におけるシナプス前支架タンパク質のBassoonの役割を調査する.
- 聴覚神経伝達におけるリボンアンカリングの障害による機能的影響を明らかにする.
主な方法:
- リボンシナプスの構造と機能を研究するために,機能的なBassoonが欠けているマウス変異体を使用しました.
- 記録されたエクソサイト性IHC容量変化と音に誘発されたスパイラルギャングリアニューロン活性化.
- IHCにおける膀プール,エクソサイトーシス,内細胞膜回収を分析した.
主要な成果:
- Bassoon欠乏マウスのシナプスリボン固定障害が観察されました.
- 容易に放出できる膀のプールが減少し,同期的な聴覚信号が損なわれたことが明らかでした.
- 髪の細胞エクソサイトーシスとスパイラルギャングリオンニューロン活性化が,アンカーされたリボン番号と相関しています.
結論:
- Bassoonによるリボンアンカリングは,IHCシナプスで容易に放出できる膀プールを維持するために重要です.
- リボン依存の同期解離は,正常な聴覚信号と聴覚に不可欠です.
- 持続的なエクソサイトーシスとエンドサイトーシスは無傷であるが,リボン欠乏は膜プロファイルの蓄積につながる.
関連する概念動画
Synaptic 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.
Hair Cells
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Synaptic 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...
Electrical Synapses
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...


