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関連する概念動画

The Blood-brain Barrier00:49

The Blood-brain Barrier

Overview
Gap Junctions01:37

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
Non-gated Ion Channels01:24

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Gap Junctions01:27

Gap Junctions

The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...

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関連する実験動画

Updated: Jul 11, 2026

A Human Blood-Brain Interface Model to Study Barrier Crossings by Pathogens or Medicines and Their Interactions with the Brain
07:52

A Human Blood-Brain Interface Model to Study Barrier Crossings by Pathogens or Medicines and Their Interactions with the Brain

Published on: April 9, 2019

缺血はニューロンのギャップ・ジャンクション・ヘミチャネルを開く.

Roger J Thompson1, Ning Zhou, Brian A MacVicar

  • 1Department of Psychiatry and Brain Research Centre, University of British Columbia, Vancouver, British Columbia V6T 2B5, Canada.

Science (New York, N.Y.)
|May 13, 2006
PubMed
まとめ
この要約は機械生成です。

脳卒中による神経損傷は,大導電性チャネルを含む. 私たちの研究は,酸素/グルコースの欠乏がニューロンのヘミチャネルを開き,不血性イベントの際に細胞死亡に貢献することを明らかにしています.

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Compartmentalization of Human Stem Cell-Derived Neurons within Pre-Assembled Plastic Microfluidic Chips
06:46

Compartmentalization of Human Stem Cell-Derived Neurons within Pre-Assembled Plastic Microfluidic Chips

Published on: May 3, 2019

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
08:33

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts

Published on: July 18, 2025

関連する実験動画

Last Updated: Jul 11, 2026

A Human Blood-Brain Interface Model to Study Barrier Crossings by Pathogens or Medicines and Their Interactions with the Brain
07:52

A Human Blood-Brain Interface Model to Study Barrier Crossings by Pathogens or Medicines and Their Interactions with the Brain

Published on: April 9, 2019

Compartmentalization of Human Stem Cell-Derived Neurons within Pre-Assembled Plastic Microfluidic Chips
06:46

Compartmentalization of Human Stem Cell-Derived Neurons within Pre-Assembled Plastic Microfluidic Chips

Published on: May 3, 2019

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
08:33

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts

Published on: July 18, 2025

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
  • 病理生理学 病理生理学とは

背景:

  • 神経刺激毒性は,脳卒中病理学の重要なメカニズムです.
  • この興奮毒性は,十分に理解されていない大導電性イオンチャネルの活性化に関連しています.
  • チャンネル活性化は,神経細胞の腫れとカルシウムホメオスタシスの障害につながる.

研究 の 目的:

  • 缺血状態における神経刺激毒性に関与する特定のチャネルを特定する.
  • 酸素とグルコース欠乏 (OGD) の後の神経損傷におけるヘミチャネルの役割を調査する.

主な方法:

  • ニューロンにおける酸素/グルコース欠乏 (OGD) を用いて,不血症のような状態を誘導する.
  • ヘミチャネル活動を検出するために,小さな光分子の膜電流とフクロスの測定.
  • ヘミチャネル阻害剤の適用は,OGDによって誘発される電流と染料流量に対する効果を評価するために行われます.
  • ヘミチャネル伝導性を特徴付けるためのシングルチャネル記録.

主要な成果:

  • 缺血症のような状態 (OGD) は,ニューロンのヘミチャネルの開通を誘発した.
  • ヘミチャネルの開口は,大きな線形電流と,神経膜を横切る光染料の流れによって証明された.
  • シングルチャネル記録では,530ピコシエメンスの伝導度を持つヘミチャネル開口が特定されました.
  • ヘミチャネルの阻害剤は,観測された電流と染料の流れの両方を効果的に遮断しました.

結論:

  • ヘミチャネル開口は,脳卒中のニューロンのイオン不調に大きく貢献します.
  • これらの発見は,ヘミチャネルが不血性ニューロン死亡の至る所に存在する構成要素であることを示唆しています.
  • ヘミチャネル活動をターゲットにすることで,脳卒中の治療のための新しい治療戦略を提供することができる.