Voltage-gated ion channels
1Klinik für Anästhesiologie, Universität Erlangen-Nürnberg, Krankenhausstr. 12, 91054, Erlangen, Germany. carla.nau@kfa.imed.uni-erlangen.de
Handbook of Experimental Pharmacology
|January 5, 2008
Summary
Anesthetics
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- The precise molecular mechanisms underlying general anesthesia remain incompletely understood.
- Identifying how volatile anesthetics induce loss of consciousness and analgesia is a key challenge in neuroscience.
- Recent advancements have focused on identifying specific protein targets for anesthetic action.
Purpose of the Study:
- To review the current understanding of anesthetic molecular targets in the central nervous system.
- To explore the debate on whether anesthesia results from major effects on few sites or minor effects on many sites.
- To highlight the role of voltage-gated ion channels as potential targets for general anesthesia.
Main Methods:
- Review of existing scientific literature on anesthetic mechanisms.
- Analysis of studies identifying protein targets for volatile organic molecules.
- Discussion of experimental evidence supporting or refuting different anesthetic theories.
Main Results:
- Anesthetics likely bind directly to protein targets within the central nervous system.
- Voltage-gated ion channels are strong candidates for mediating anesthetic effects.
- The debate continues regarding whether anesthesia involves a few critical molecular sites or numerous small perturbations.
Conclusions:
- Understanding anesthetic targets is crucial for advancing anesthesia safety and efficacy.
- Voltage-gated ion channels represent a significant area of focus for future anesthetic research.
- Further investigation is needed to resolve the precise molecular underpinnings of general anesthesia.
Related Concept Videos
Voltage-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...
Voltage-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...
Non-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.
Non-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.
Ion 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...
Mechanically-gated Ion Channels
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...


