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Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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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...
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Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Chemical Synapses01:26

Chemical Synapses

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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...
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Chemical Synapses01:26

Chemical Synapses

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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...
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Updated: Apr 30, 2026

Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
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Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex

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軸索シナプスのソートリング

Helene Schmidt1,2, Anjali Gour1, Jakob Straehle1

  • 1Department of Connectomics, Max Planck Institute for Brain Research, D-60438 Frankfurt, Germany.

Nature
|September 30, 2017
PubMed
まとめ
この要約は機械生成です。

脳内の刺激性ニューロン軸索は

さらに関連する動画

Visualization of Cortical Modules in Flattened Mammalian Cortices
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関連する実験動画

Last Updated: Apr 30, 2026

Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
09:45

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Published on: March 28, 2012

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Visualization of Cortical Modules in Flattened Mammalian Cortices
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科学分野:

  • 神経科学
  • 計算神経科学
  • 細胞神経科学

背景:

  • ニューロンの接続性の研究は伝統的にシナプスの存在,強さ,位置に焦点を当てています.
  • 個々のプレシナプス軸索樹のシナプス組織は,主に特徴づけられていない.
  • 神経回路の機能を解読するには 軸索のシナプス組織を理解することが重要です

研究 の 目的:

  • 中枢内皮質の2層の局所的な前シナプス軸索のシナプス組織を調査する.
  • 神経回路の機能における軸索シナプスの分類の役割を明らかにする.
  • 同期ニューロンの活動に 特定された回路の影響を分析する.

主な方法:

  • 3次元の電子顕微鏡で 密度の高い再構築を ラットモデルで利用しました
  • 中央の腸内皮質の局所的なプレシナプス軸索のシナプス組織を分析した.
  • 回路の機能を評価するために計算シミュレーションを実行します.

主要な成果:

  • 経路長に依存する軸索シナプス分類が観察され,刺激性軸索が抑制性および刺激性ニューロンを標的にする.
  • 菌糸体阻害回路を明らかにした. 幅広い菌糸体阻害軸索と, 群集した dendritic シナプス.
  • シミュレーションにより,同期活動伝播を制御する回路の能力が示されました.

結論:

  • この研究は,軸索の投影における新しいシナプス組織原理を発見した.
  • ニューロンのネットワークを 制御する 抑制回路を特定した
  • 発見は,中枢内皮質の機能的構造と空間表現におけるその役割についての洞察を提供します.