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Related Concept Videos

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.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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,...
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.
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
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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.
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Updated: Jun 16, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Calmodulin antagonists induce platelet apoptosis.

Zhicheng Wang1, Suping Li, Quanwei Shi

  • 1School of Biological Science and Medical Engineering, Beihang University, Beijing, China.

Thrombosis Research
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Calmodulin (CaM) antagonists trigger programmed cell death (apoptosis) in human platelets. These compounds also inhibit platelet aggregation and adhesion, suggesting a role in regulating platelet function and survival.

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Area of Science:

  • Platelet biology
  • Apoptosis research
  • Pharmacology

Background:

  • Calmodulin (CaM) antagonists are known anti-cancer agents that induce apoptosis in tumor cells.
  • CaM interacts with platelet receptors, and CaM antagonists affect receptor-mediated platelet functions.
  • The effect of CaM antagonists on platelet apoptosis remained unexplored.

Purpose of the Study:

  • To investigate whether CaM antagonists induce apoptosis in human platelets.
  • To elucidate the mechanisms underlying CaM antagonist-induced platelet apoptosis.

Main Methods:

  • Treatment of human platelets with CaM antagonists (W7, TMX, TFP).
  • Assessment of apoptotic events: mitochondrial membrane potential, caspase-3 activation, phosphatidylserine exposure.
  • Evaluation of platelet activation markers (P-selectin, PAC-1 binding).
  • Measurement of platelet aggregation, adhesion, and spreading.
  • Analysis of cytosolic Ca(2+) levels and the effect of Ca(2+) chelation.

Main Results:

  • CaM antagonists induced significant apoptotic events in human platelets.
  • CaM antagonists did not cause platelet activation but impaired aggregation, adhesion, and spreading.
  • W7 and TMX elevated cytosolic Ca(2+) levels; BAPTA-AM reduced W7-induced apoptosis.

Conclusions:

  • CaM antagonists induce apoptosis in human platelets.
  • Ca(2+) level elevation may play a role in CaM antagonist-induced platelet apoptosis.
  • These findings highlight a novel mechanism of CaM antagonist action on platelets.