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相关概念视频

Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
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Nervous Tissue: Neuron Types

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相关实验视频

Updated: Jun 29, 2026

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
07:51

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Published on: November 14, 2014

异构型NMDA受体:子类型的分子和功能区别.

H Monyer1, R Sprengel, R Schoepfer

  • 1Center for Molecular Biology, University of Heidelberg, Germany.

Science (New York, N.Y.)
|May 22, 1992
PubMed
概括
此摘要是机器生成的。

研究人员在老鼠大脑中发现了新的N-甲基D-酸盐 (NMDA) 受体子单元 (NR2A,NR2B,NR2C). 这些子单元仅在与NR1子单元结合时才形成功能性NMDA受体,这表明神经元中存在不同的受体亚型.

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A High-throughput Calcium-flux Assay to Study NMDA-receptors with Sensitivity to Glycine/D-serine and Glutamate
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Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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科学领域:

  • 神经科学是一个神经科学.
  • 分子生物学分子生物学
  • 生物化学 生物化学

背景情况:

  • N-甲基D-酸盐 (NMDA) 受体是中枢神经系统中至关重要的离子通道.
  • 这些受体是谷氨酸受体,透性,对和甘氨酸敏感.
  • 了解NMDA受体的多样性是解读神经元功能的关键.

研究的目的:

  • 为了识别和描述NMDA受体的新型子单元.
  • 研究由这些新子单元形成的NMDA受体亚型的功能性质.
  • 探索这些受体亚型在老鼠大脑中的潜在分布.

主要方法:

  • 来自老鼠大脑的互补DNA (cDNA) 物种的分子克隆.
  • 在培养细胞中克隆子单元的表达.
  • 电生理学记录以评估谷氨酸和NMDA激活电流.
  • 对NR1和NR2亚单元的信使RNA (mRNA) 分布的分析.

主要成果:

  • 确定了三个新的NMDA受体子单元 (NR2A,NR2B,NR2C),显示出55-70%的序列相同性.
  • 这些子单元仅在与NR1子单元共同表达时才形成功能性NMDA受体.
  • 异构管道 (NR1-NR2A,NR1-NR2C) 呈现出明显的门和敏感性.
  • NR1 mRNA分布广泛,而NR2 mRNA分布在整个大脑中是不同的.

结论:

  • 新的NMDA受体子单元 (NR2A-C) 已被识别和克隆.
  • 功能性NMDA受体是异构的,需要NR1和至少一个NR2亚单元.
  • 亚单元组成的差异导致通道属性的变化,表明功能多样性.
  • NR2子单元的不同表达模式意味着在不同的神经元群体中具有特定的作用.