合成塩化物チャネルは細胞膜ポテンシャルと電圧ゲートカルシウムチャネルを調節する
Xiang Li1, Bing Shen, Xiao-Qiang Yao
1Morningside Laboratory for Chemical Biology, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China.
Journal of the American Chemical Society
|September 24, 2009
まとめ
この研究では,合成塩化物チャネルが,細胞膜の潜在力を変化させることで,生物学的プロセスを調節する方法が示されています. イット・イット・イット
科学分野:
- 生物物理化学 生物物理化学とは
- 分子生物学は分子生物学である.
- 生理学 生理学とは
背景:
- 合成イオンチャネルは,生物学的イオンチャネル機能を複製することを目的としています.
- 合成イオンチャネルのin vivo生物学的役割はほとんど不明である.
- 細胞膜ポテンシャルを調節することは,多くの細胞プロセスの鍵です.
研究 の 目的:
- 合成イオンチャネルの生物学的応用を調査する.
- 細胞機能を混乱させるための合成塩化物チャネルの使用を実証する.
- 自然のイオンチャネルと人工チャネルによる細胞反応の調節を調査する.
主な方法:
- 合成塩化物チャネルを用いて,細胞膜の潜在力を変化させた.
- 生体系における天然の電圧誘導カルシウムチャネルに対する観察された影響.
- 細胞内カルシウム濃度と滑らかな筋肉の細胞収縮を測定した.
主要な成果:
- 合成塩化物チャネルは,細胞膜ポテンシャルをうまく調節した.
- この調節は,天然の電圧ゲートカルシウムチャネルと細胞内カルシウムレベルに影響を与えました.
- 滑らかな筋肉細胞の収縮は,合成チャネルの作用によって調節された.
結論:
- この研究は,天然のイオンチャネルと細胞機能を in vivo で調節する最初の人工イオンチャネルを紹介しています.
- 合成イオンチャネルは,生物学的システムを混乱させ,理解するためのツールとして役立つ.
- この研究は,合成イオンチャネルを生物学で適用するための新しい道を開きます.
関連する概念動画
01:26Voltage-gated Ion Channels
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 types of...
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 types of...
01:26Voltage-gated Ion Channels
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 types of...
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 types of...
01:19The Role of Ion Channels in Neuronal Computation
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.
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.
01:24Non-gated Ion Channels
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
01:24Non-gated Ion Channels
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism.
01:19Ion Channels
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 specific...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...