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相关概念视频

GPCR Desensitization01:12

GPCR Desensitization

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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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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...
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Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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The Two-State Receptor Model01:29

The Two-State Receptor Model

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
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Opioid Receptors: Overview01:22

Opioid Receptors: Overview

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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

3.6K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Structural Basis of Inhibition and Desensitization in Heteromeric Kainate Receptors.

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相关实验视频

Updated: Jan 9, 2026

Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
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Purification and Reconstitution of TRPV1 for Spectroscopic Analysis

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结构性洞察力对开纳酸受体脱敏的结构性洞察力

Changping Zhou1, Guadalupe Segura-Covarrubias1, Nami Tajima2

  • 1Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Ohio, 44106, USA.

Nature communications
|December 9, 2025
PubMed
概括

凯纳酸受体 (KARs) 经历独特的脱敏化,需要大规模的结构变化. 这项研究表明,KAR联体结合域的横向运动是通道完全关闭和脱敏的关键.

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
  • 结构生物学 结构生物学

背景情况:

  • 凯纳酸受体 (KARs),一种类型的离子转移性谷氨酸受体 (iGluR),对于刺激性神经递质和神经递质释放至关重要.
  • 受体无敏化对于调节突触传输强度至关重要,但KARs与其他iGluR相比表现出明显的无敏化构造.

研究的目的:

  • 研究KAR脱敏化所需的大型形状变化背后的机制.
  • 阐明KARs在脱敏化过程中的结构动态.

主要方法:

  • 低温电子显微镜 (cryo-EM) 用于确定GluK2的结构,在各种状态下具有双氨酸突变.
  • 进行了贴片记录和波动分析,以评估受体功能和离子透性.

主要成果:

  • 冷EM揭示了KARs的非活跃和多种无敏化构造,包括由氨酸交叉链稳定的浅度无敏化状态.
  • 浅度无敏化构造类似于非KAR iGluRs的典型无敏化状态.
  • 补丁数据表明,在浅无敏状态下,KARs 仍然具有离子透性,这表明完全关闭通道需要进一步的结构变化.

结论:

  • KAR连接体结合域的侧向旋转运动对于完全脱敏的受体的通道闭合和稳定至关重要.

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  • 这项研究提供了对KAR脱敏和其独特的形状动态的机制性理解.