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Related Concept Videos

Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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...
Antianginal Drugs: Calcium Channel Blockers and Ranolazine01:25

Antianginal Drugs: Calcium Channel Blockers and Ranolazine

Angina pectoris, a primary symptom of ischemic heart disease, requires careful pharmacological interventions. In this context, calcium channel blockers (CCBs) and ranolazine have emerged as crucial pharmacotherapeutic agents, providing deep insights into the complexities of angina management.
CCBs, a diverse class that includes dihydropyridines (nifedipine) and diphenylalkylamines (verapamil and diltiazem), exert their effect by blocking calcium channels in cardiac and smooth muscle cells. This...
Antiepileptic Drugs: Calcium Channel Blockers01:17

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Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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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 the heart's...

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Characterizing Modulators of Protease-Activated Receptors with a Calcium Mobilization Assay Using a Plate Reader
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Published on: May 24, 2024

P/Q-type calcium channel modulators.

V Nimmrich1, G Gross

  • 1Neuroscience Research, GPRD, Abbott, Ludwigshafen, Germany.

British Journal of Pharmacology
|June 8, 2012
PubMed
Summary
This summary is machine-generated.

P/Q-type calcium channels are crucial for neurological function. This review details compounds modulating these channels, aiding interpretation of experimental and clinical data for neurological diseases.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • P/Q-type calcium channels are vital for neurotransmitter release and implicated in neurological disorders like ataxia, migraine, and Alzheimer's disease.
  • Current specific blockers are limited to ω-agatoxins, with other modulators showing variable selectivity and complex actions.
  • Existing therapeutics may also affect P/Q channels, complicating data interpretation.

Purpose of the Study:

  • To provide a comprehensive overview of compounds modulating P/Q-type calcium channels.
  • To aid in interpreting in vitro and in vivo experimental results concerning P/Q channel modulators.
  • To explain clinical observations by linking them to P/Q channel activity of non-selective drugs.

Main Methods:

  • Literature review of known P/Q-type calcium channel modulators.
  • Analysis of compound selectivity, mode of action, and potency variations.
  • Correlation of experimental findings with clinical observations of drug effects.

Main Results:

  • Identified ω-agatoxins as specific peptide blockers; other modulators include peptides and low molecular weight compounds.
  • Noted diverse modulation patterns, including bidirectional effects, and activity of existing therapeutics.
  • Highlighted significant variability in reported potency due to experimental differences and splice variants.

Conclusions:

  • Understanding P/Q channel modulator profiles is essential for accurate data interpretation in research and clinical settings.
  • Variability in experimental systems and drug selectivity complicates the study of P/Q channels.
  • Discusses opportunities and challenges in developing selective P/Q channel modulators for therapeutic use.