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相关概念视频

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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相关实验视频

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

缺血症打开神经元间隙连接 hemichannels 半通道

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
概括
此摘要是机器生成的。

脑卒中引起的神经元损伤涉及大导电通道. 我们的研究表明,缺氧/葡萄糖会打开神经元的半通道,在缺血事件中导致细胞死亡.

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科学领域:

  • 神经科学是一个神经科学.
  • 细胞生物学 细胞生物学
  • 病理生理学 病理生理学

背景情况:

  • 神经刺激毒性是中风病理学的关键机制.
  • 这种兴奋毒性与人们不太了解的大导电离子通道的激活有关.
  • 道激活导致神经元胀和破坏平衡.

研究的目的:

  • 确定在缺血性疾病期间参与神经元刺激毒性的特定通道.
  • 为了调查 hemichannels 在氧气和葡萄糖剥夺 (OGD) 后的神经元损伤中的作用.

主要方法:

  • 在神经元中使用氧气/葡萄糖剥夺 (OGD) 诱导缺血性状况.
  • 测量膜电流和小光分子的流量,以检测半通道活动.
  • 应用半通道抑制剂来评估它们对OGD诱导的电流和染料流量的作用.
  • 单通道记录来描述半通道导电性.

主要成果:

  • 缺血性状况 (OGD) 诱导了神经元半通道的开放.
  • 半通道的开放被大型线性电流和光染料在神经元膜上的流动所证明.
  • 单通道记录确定了半通道开口,导电量为530 picosiemens.
  • 半通道抑制剂有效地阻断了观察到的电流和染料流量.

结论:

  • 半通道开放是中风期间神经元中离子失调的重要贡献者.
  • 这些发现表明,双通道是缺血性神经元死亡的普遍组成部分.
  • 向半导体活动可能为中风治疗提供一种新的治疗策略.