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Related Concept Videos

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

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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...
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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

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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,...
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Voltage-gated Ion Channels01:26

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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.
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Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
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Resting Membrane Potential01:24

Resting Membrane Potential

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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.
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Updated: Jun 23, 2025

Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique
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Salidroside modulates repolarization through stimulating Kv2.1 in rats.

Yating Zhang1, Rui Li2, Hong Jiang3

  • 1State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy/School of Modern Chinese Medicine Industry, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China; Innovative Institute of Chinese Medicine and Pharmacy/Academy for Interdiscipline, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.

European Journal of Pharmacology
|June 16, 2024
PubMed
Summary
This summary is machine-generated.

Salidroside (Sal) protects against cardiac arrhythmias by modulating voltage-gated potassium (Kv) channels, specifically Kv2.1. This study explored Sal

Keywords:
ArrhythmiaKv2.1 channelP–V loopRepolarizationSalidroside

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Area of Science:

  • Cardiovascular Pharmacology
  • Molecular Cardiology
  • Ionic Mechanisms

Background:

  • Voltage-gated potassium (Kv) channel dysfunction is linked to cardiac arrhythmias.
  • Salidroside (Sal), from Rhodiola crenulata, shows cardioprotective potential.
  • Understanding Sal's effect on Kv2.1 channels is crucial for anti-arrhythmic mechanisms.

Purpose of the Study:

  • To investigate Sal's effects on Kv2.1 channels.
  • To elucidate the ionic mechanisms underlying Sal's anti-arrhythmic properties.
  • To evaluate Sal's efficacy in arrhythmia models.

Main Methods:

  • Arrhythmia models induced by cisapride and citalopram in rats.
  • Assessment of electrocardiography (ECG) and pressure-volume loops.
  • Cell viability assays (CCK-8) on hypoxic H9c2 cells.
  • Whole-cell patch clamp electrophysiology to measure Kv and Kv2.1 currents.
  • Molecular techniques including docking, simulations, LSPR, CETSA, qRT-PCR, Western blot, and immunofluorescence.

Main Results:

  • Sal ameliorated cisapride-induced arrhythmias and improved cardiac function in rats.
  • Sal enhanced H9c2 cell viability under hypoxic conditions.
  • Sal modulated Kv and Kv2.1 currents, inhibiting them in normal cells and enhancing them post-hypoxia.
  • Molecular studies confirmed Sal's direct binding to Kv2.1 protein, upregulating its expression.

Conclusions:

  • Salidroside demonstrates significant anti-arrhythmic effects in vivo and in vitro.
  • Sal modulates cardiac repolarization by interacting with and stimulating Kv2.1 channels.
  • These findings highlight Sal as a potential therapeutic agent for arrhythmias.