関連する実験動画
Updated: Aug 15, 2026
11:02
Presynaptically Silent Synapses Studied with Light Microscopy
Published on: January 4, 2010
SNAP媒介のタンパク質とタンパク質の相互作用は,神経伝達物質の放出に不可欠です
W M DeBello1, V O'Connor, T Dresbach
1Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710.
Nature
|February 16, 1995
まとめ
溶性NSF付着タンパク質 (SNAP) は,膀融合に不可欠である. イカのシナプスでは,SNAPは神経伝達物質の放出を促進し,構成膜融合とシナプスエクソサイトーシスの間の共通のメカニズムを示しています.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
背景:
- 溶性NSF付着タンパク質 (SNAP) は,輸送小胞と細胞内膜の構成的融合に不可欠です.
- シナプス胞エクソサイトーシスに関与するプレシナプスタンパク質はSNAPと結合し,神経伝達物質の放出のためにカルシウム調節された膜融合におけるSNAPの役割を示唆しています.
研究 の 目的:
- シナプスレベルで神経伝達物質の放出におけるSNAPの役割を調査する.
- SNAPが構成膜融合とシナプスエクソサイトーシスの共通の分子機構に関与しているかどうかを判断する.
主な方法:
- 再結合SNAPをイカの巨大シナプスに注入する.
- 結合パートナーとのSNAP相互作用を抑制するために設計されたペプチドの注射.
主要な成果:
- スカミの巨大シナプスへの再結合SNAP注入は,神経伝達物質の放出を大幅に強化しました.
- SNAPの相互作用を標的とする阻害性ペプチドは,シナプス膀のドッキングの下流で神経伝達物質の放出を阻害した.
結論:
- SNAPに依存するタンパク質複合体は,シナプスで神経伝達物質の放出を媒介する.
- 神経伝達物質の放出は,構成膜融合プロセスと共通の分子機構を共有しています.
関連する概念動画
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.
01:26Fusion of Secretory Vesicles with the Plasma Membrane
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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...
01:29Excitatory 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...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...