相关实验视频
Updated: Jun 24, 2025

13:07
One-channel Cell-attached Patch-clamp Recording
Published on: June 9, 2014
24.3K
皮埃佐1离子通道能够进行形状信号传输
Amanda H Lewis1, Marie E Cronin1, Jörg Grandl1
1Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA.
bioRxiv : the preprint server for biology
|June 10, 2024
概括
Piezo1通道通过形状变化向TREK1通道发送信号,而不是离子流. 这种机械信号传递发生在没有直接的物理相互作用的情况下,这表明了细胞力感应的新机制.
科学领域:
- 细胞机械传导 细胞机械传导
- 离子通道生理学
- 膜生物物理学 膜生物物理学
背景情况:
- Piezo1是一种机械激活的离子通道,以感应力而闻名.
- Piezo1 经历了显著的构造变化,这些变化可以影响附近的膜蛋白,包括双孔 (K2P) 通道.
- 假设Piezo1可能会向其他蛋白质发出其构造状态的信号.
研究的目的:
- 研究Piezo1调节K2P通道的功能机制,特别是TREK1.
- 确定Piezo1的构造变化或其离子透是否负责调节TREK1.
- 探索Piezo1和TREK1之间的空间关系和潜在的信号机制.
主要方法:
- 化学操作以限制Piezo1的形状灵活性.
- 超高分辨率成像以评估通道同定位.
- 随机模拟用于模拟通道相互作用和膜变形.
- 测量TREK1通道活动的功能测试.
主要成果:
- 对于调节TREK1通道活性来说,Piezo1的形状变化,而不是离子透,是必不可少的.
- 由于Piezo1和TREK1通道没有共同定位,因此排除了作为主要相互作用机制的直接结合.
- 高Piezo1密度将TREK1通道置于预测的Piezo1膜变形足迹中,这表明这种足迹介导了信号传输.
结论:
- Piezo1 在 TREK1 频道上施加构造信号.
- 该机制涉及膜变形或机械影响,而不是直接相互作用或离子流.
- 这表明Piezo1在通过间接的形状信号传递来感知和转换机械力方面发挥了新的作用.
相关概念视频
Mechanically-gated Ion Channels
6.4K
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...
6.4K
G-Protein Gated Ion Channels
4.6K
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...
Sensory...
4.6K
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.2K
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...
2.2K
Ion Channels
86.8K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
86.8K
Ligand-gated Ion Channels
12.4K
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...
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...
12.4K
Voltage-gated Ion Channels
8.2K
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...
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...
8.2K

