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Related Concept Videos

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.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
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,...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

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...
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
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Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...

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Updated: Jun 15, 2026

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

CalDAG-GEFI and platelet activation.

Lucia Stefanini1, Wolfgang Bergmeier

  • 1Department of Medicine and Cardeza Foundation, Thomas Jefferson University, Philadelphia, PA, USA.

Platelets
|March 12, 2010
PubMed
Summary

Platelet activation during vascular injury involves CalDAG-GEFI (RasGRP2), which works with protein kinase C and P2Y12. This signaling pathway suggests CalDAG-GEFI as a new target for anti-platelet therapies to prevent thrombosis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Platelet activation at vascular injury sites is crucial for thrombosis and hemostasis.
  • Understanding the molecular mechanisms of rapid platelet activation is key to developing effective therapies.

Purpose of the Study:

  • To review recent findings on the role of CalDAG-GEFI (RasGRP2) in platelet activation.
  • To explore the synergistic signaling pathways involving CalDAG-GEFI, protein kinase C, and P2Y12.
  • To evaluate CalDAG-GEFI as a potential novel target for anti-platelet therapy.

Main Methods:

  • Review of recent scientific literature and findings.
  • Analysis of signaling pathways in platelet activation.
  • Identification of key molecular players and their interactions.

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Microfluidics in Assessing Platelet Function
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Microfluidics in Assessing Platelet Function

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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
08:04

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Main Results:

  • CalDAG-GEFI (RasGRP2) is identified at the center of rapid calcium-dependent platelet activation.
  • A complex synergy exists between CalDAG-GEFI, protein kinase C, and the Gi-coupled P2Y12 receptor.
  • These findings highlight the significant role of CalDAG-GEFI in platelet signaling.

Conclusions:

  • CalDAG-GEFI is a critical mediator of rapid platelet activation.
  • The synergistic signaling involving CalDAG-GEFI, PKC, and P2Y12 is essential for platelet function.
  • CalDAG-GEFI represents a promising novel target for developing anti-platelet drugs to combat thrombosis.