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相关概念视频

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

6.2K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Patch Clamp01:18

Patch Clamp

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Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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Action Potentials01:41

Action Potentials

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Overview
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Action Potential01:31

Action Potential

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

8.0K
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
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相关实验视频

Updated: Jun 7, 2025

One-channel Cell-attached Patch-clamp Recording
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哺乳动物的PIEZO通道纠正离子电流.

Tharaka D Wijerathne1, Aashish Bhatt2, Wenjuan Jiang2

  • 1Department of Biomedical Sciences, Western University of Health Sciences, Pomona, California.

Biophysical journal
|November 15, 2024
PubMed
概括
此摘要是机器生成的。

哺乳动物PIEZO通道 (PIEZO1和PIEZO2) 自然地纠正化物电流,与电流不同. 这种离子通道整正可以通过孔隙静电学调整,如PIEZO1突变体所示.

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Electrophysiological Recordings of Single-cell Ion Currents Under Well-defined Shear Stress
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科学领域:

  • 生物物理学的生物物理.
  • 分子生物学分子生物学
  • 离子通道生理学 离子通道生理学

背景情况:

  • 哺乳动物PIEZO通道 (PIEZO1和PIEZO2) 是机械敏感的离子通道,主要以阴离子透而闻名.
  • 虽然PIEZO1表现出一些化物透性,但PIEZO通道中的离子透和整形机制在很大程度上仍未被探索.
  • 了解阴离子透对于在细胞生理学中全面了解PIEZO通道功能至关重要.

研究的目的:

  • 通过哺乳动物PIEZO1和PIEZO2通道研究化物流的整形性质.
  • 探索孔隙静电学在调节阳离子透和整定中的作用.
  • 描述PIEZO通道中阴离子和阴离子电流之间的纠正差异.

主要方法:

  • 电生理学记录 (例如,补丁) 用于测量和流.
  • 使用非永久电流来隔离和测量特定的离子电流.
  • 进行了分子动力学模拟,以分析孔隙结构和静电潜力.

主要成果:

  • 无论是PIEZO1和PIEZO2通道都表现出化物电流的向外纠正,有利于化物进入其逆转潜力以上的电压.
  • 通过PIEZO1和PIEZO2的电流显示了最小的整形.
  • 一个PIEZO1突变体 (9K) 显示了化物电流的向内纠正,与孔隙化中的正静电电位相关.

结论:

  • 哺乳动物PIEZO通道具有固有的化物电流整顿机制.
  • 皮索通道孔的静电特性显著影响并可以调整化物电流整形.
  • 这些发现揭示了PIEZO通道离子选择性和传输的新方面.