Related Experiment Video
Updated: Jul 10, 2026
10:14
Recapitulation of an Ion Channel IV Curve Using Frequency Components
Published on: February 8, 2011
Temperature-dependent functional inversion of Cav3.2 channels during repetitive activity
Kacper Pawlak1, Petr Daněk2, Bohumila Jurkovičová-Tarabová3
1Department of Pathophysiology, Third Faculty of Medicine, Charles University, Prague, Czech Republic.
Molecular Brain
|July 9, 2026
Summary
Temperature significantly impacts T-type calcium channels (Cav3.2) function during nerve activity. Cooling slows channel gating, but paradoxically enhances calcium influx during high-frequency firing, impacting pain signaling.
Area of Science:
- Neuroscience
- Molecular Biology
- Biophysics
Background:
- Temperature critically affects neuronal excitability and ion channel function.
- Cav3.2 T-type calcium channels in sensory neurons are implicated in pain and cold hypersensitivity.
- The influence of temperature on Cav3.2 during repetitive neuronal firing is not well understood.
Purpose of the Study:
- To investigate the effects of temperature on Cav3.2 channel gating and calcium influx during simulated neuronal activity.
- To elucidate the temperature-dependent functional characteristics of Cav3.2 channels.
Main Methods:
- Whole-cell voltage-clamp recordings were performed on neurons expressing Cav3.2 channels at physiological (37°C), room (22°C), and cold (13°C) temperatures.
- Standard voltage-step protocols and action-potential-like waveforms at varying frequencies (10-100 Hz) were used to assess channel kinetics and calcium influx.
Main Results:
- Cooling reduced Cav3.2 current amplitude but significantly slowed activation, inactivation, deactivation, and recovery kinetics.
- Temperature dependence of steady-state voltage-gating was less pronounced than kinetic transitions.
- During high-frequency stimulation, cooling inverted the typical temperature dependence, enhancing cumulative Cav3.2 calcium influx due to slowed inactivation and deactivation.
- A kinetically altered Cav3.2 variant (V416R) showed reduced temperature-dependent inversion.
Conclusions:
- Cav3.2 channels exhibit complex, non-uniform temperature sensitivity across different gating steps.
- A functional inversion occurs where cooling enhances Cav3.2-mediated calcium influx during high-frequency neuronal activity.
- This temperature-dependent functional inversion has significant implications for understanding neuropathic pain and cold hypersensitivity.
Related Concept Videos
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...
01:12Mechanically-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...
01:12Mechanically-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...
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.