休息的人类脑状网状细胞经历了增强性阴离子的流入
Oleg Yarishkin1, Monika Lakk1, Christopher N Rudzitis1
1University of Utah.
Research square
|September 11, 2024
概括
状眼网 (TM) 细胞通过一种新型的阴离子泄漏电流维持静止膜潜力,这对于调节眼内压力 (IOP) 至关重要. 这种电流与众所周知的通道不同,它会影响细胞信号传输和离子平衡.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生理学 细胞生理学
- 离子通道生物学 离子通道生物学
背景情况:
- 脊椎网格 (TM) 通过感知机械和生化线索来调节眼内压力 (IOP).
- 了解在静止的TM细胞中负责离子稳态的离子通道至关重要,但在很大程度上是未知的.
- 电生理学研究表明,压力感应离子通道介导TM细胞信号传递.
研究的目的:
- 确定负责TM细胞中静止膜潜能和离子恒温的离子通道.
- 描述TM细胞中构成性离子导电性的特性.
- 研究TRP通道在TM细胞休息潜力的作用.
主要方法:
- 电生理学测量TM细胞的静止潜力和离子电流.
- 离子替代实验以确定电荷载体 (例如Na+).
- 使用通道阻塞剂和激活剂进行药理分析 (例如TTX,维拉帕米尔,SEA-0440,Gd3+,红,GSMTx4,Pyr3,Pico1,4,5,SKF96365).
- 转录分析以检测TRP基因表达.
主要成果:
- 一个强大的阴离子导电,依赖于Na +,是TM静止潜力的基础.
- 这种导电性不同于电压关闭的Na+/Ca2+通道,ENaC和Na+/H+交换.
- 涉及到TRP类通道,特别是TRPC1,尽管经典的TRPC阻塞剂有意想不到的效果.
- 发现了一种新型的构成性单价离子泄漏电流,其特征并非完全由已知的TRP通道形成.
结论:
- TM细胞具有独特的阴离子泄漏电流,对于维持静止膜潜力和Na+恒温来说至关重要.
- 这种新鲜的电流,可能与TRP有关,但在分子上未被识别,影响TM细胞信号传递和IOP调节.
- 需要进一步的研究来确定这个关键离子通道的分子特征.
更多相关视频
08:30Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents
Published on: January 31, 2020
7.2K
08:27Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
Published on: January 7, 2019
9.4K
相关概念视频
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
Mechanically-gated Ion Channels
6.3K
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...
6.3K
The Resting Membrane Potential
131.5K
Overview
131.5K
Feedback Regulation of Calcium Concentration
3.4K
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
3.4K
Resting Membrane Potential
18.3K
The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
18.3K
Tight Junctions
5.2K
Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
5.2K
