Related Experiment Video

Updated: May 12, 2025

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
08:11

Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique

Published on: November 11, 2022

2.7K

Chlorpromazine directly inhibits Kv1.3 channels by facilitating the inactivation of channels

Seo-In Park1,2, Soobeen Hwang2, Young Lee1

  • 1Department of Physiology, Dental Research Institute, Seoul National University School of Dentistry, Seoul, 03080, Republic of Korea.

Molecular Brain
|May 9, 2025
PubMed

Insights

Chlorpromazine (CPZ) directly inhibits Kv1.3 channels, a key player in microglial neuroinflammation. This direct channel blockade, independent of dopamine receptors, clarifies CPZ's anti-inflammatory mechanism in the brain.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Ion Channel Physiology

Background:

  • Microglia-expressed Kv1.3 channels are critical regulators of neuroinflammation.
  • The antipsychotic chlorpromazine (CPZ) exhibits anti-inflammatory properties by reducing Kv1.3 channel activity in medial prefrontal cortex (mPFC) microglia.
  • The exact mechanism of CPZ's action in the mPFC is not fully understood due to CPZ's known interaction with dopamine receptors present in various mPFC cell types.

Purpose of the Study:

  • To elucidate the precise mechanism by which chlorpromazine (CPZ) inhibits Kv1.3 channels.
  • To determine if CPZ's inhibition of Kv1.3 channels involves dopamine receptors or other ion channels.
  • To understand the direct interaction between CPZ and Kv1.3 channels.

Main Methods:

  • Utilized Xenopus laevis oocytes expressing human Kv1.3 channels for electrophysiological recordings.
  • Investigated the concentration-dependent effects of CPZ on Kv1.3 channel currents.
  • Assessed the voltage-dependence of CPZ-mediated Kv1.3 channel inhibition.
  • Analyzed the impact of CPZ on Kv1.3 channel activation and inactivation kinetics.

Main Results:

  • Chlorpromazine (CPZ) directly inhibits Kv1.3 channel currents in a concentration-dependent manner.
  • The inhibition of Kv1.3 channels by CPZ is not dependent on voltage.
  • CPZ accelerates the inactivation of Kv1.3 channels without significantly altering their activation properties.
  • CPZ's inhibitory effect on Kv1.3 channels is independent of dopamine receptors or other ion channels.

Conclusions:

  • Chlorpromazine (CPZ) directly blocks Kv1.3 channels, representing a primary mechanism for its anti-inflammatory effects.
  • This direct channel blockade by CPZ occurs independently of dopamine receptor interactions.
  • The findings provide a clearer understanding of how CPZ suppresses neuroinflammation by targeting Kv1.3 channels in microglia.
Keywords:
ChlorpromazineInactivationKv1.3 channelMicrogliaNeuroinflammation

More Related Videos

High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels10:07

High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels

Published on: January 27, 2013

15.0K
Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique07:19

Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique

Published on: February 7, 2025

189

Related Concept Videos

Chemotherapy-Induced Nausea and Vomiting: Dopamine Receptor Antagonists01:29

Chemotherapy-Induced Nausea and Vomiting: Dopamine Receptor Antagonists

Dopamine receptor antagonists, also known as antipsychotic agents, are critical in managing chemotherapy-induced vomiting. These antiemetic agents block dopamine receptors in the chemoreceptor trigger zone (CTZ), inhibiting signal transmission to the vomiting center. Antipsychotic agents encompass phenothiazines (PTZ), butyrophenones, benzamides, and thienobenzodiazepines (Zyprexa), which are utilized for their antiemetic and sedative properties.
Phenothiazines, such as prochlorperazine...
184
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
1.1K
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
823
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
1.1K
Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists01:28

Chemotherapy-Induced Nausea and Vomiting: Neurokinin-1 Receptor Antagonists

Neurokinin 1 (NK1) receptors are distributed across the GI tract, vagal afferents, and key CNS regions including the central vomiting center and chemoreceptor trigger zone (CTZ) Chemotherapy agents stimulate enterochromaffin cells in the gastrointestinal (GI) tract to release large amounts of substance P (SP). SP is a neuropeptide released by specific sensory nerves in response to many different stressors, including those in the GI mucosa affected by chemotherapy.  SP binds and activates...
137
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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...
2.0K