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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.
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...
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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
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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.
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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Ferric Chloride-induced Murine Thrombosis Models
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Published on: September 5, 2016

Complement activation on platelets: implications for vascular inflammation and thrombosis.

Ellinor I Peerschke1, Wei Yin, Berhane Ghebrehiwet

  • 1Department of Pathology, Mount Sinai School of Medicine, New York, NY 10029, USA. ellinor.peerschke@mountsinai.org

Molecular Immunology
|July 13, 2010
PubMed
Summary

Platelets can activate complement pathways, increasing inflammation and thrombosis. This platelet complement activation is linked to arterial clots in autoimmune diseases and platelet removal in immune thrombocytopenia purpura.

Keywords:
Plateletsantiphospholipid syndromecomplementimmune thrombocytopenia purpurainflammationsystemic lupus erythematosusthrombosis

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Published on: April 2, 2013

Area of Science:

  • Hematology
  • Immunology
  • Vascular Biology

Background:

  • Platelets are key responders to vascular injury.
  • Emerging evidence indicates platelets interact with complement pathways.
  • Platelet activation is linked to complement system engagement.

Purpose of the Study:

  • To investigate the role of platelets in complement activation.
  • To explore the clinical implications of platelet-mediated complement activation.

Main Methods:

  • Studied platelet activation by agonists and shear stress.
  • Assessed expression of P-selectin, gC1qR, and chondroitin sulfate.
  • Measured soluble inflammatory mediators (C3a, C5a).
  • Correlated platelet complement activation with clinical data in autoimmune diseases.

Main Results:

  • Platelet activation triggers classical and alternative complement pathways.
  • Platelet complement activation increases C3a and C5a levels.
  • Platelets are targets of complement in antiphospholipid syndromes (APS) and immune thrombocytopenia purpura (ITP).
  • Enhanced platelet complement activation correlates with arterial thrombosis in lupus erythematosus and APS.
  • Enhanced platelet complement activation correlates with platelet clearance in ITP.

Conclusions:

  • Platelet-mediated complement activation contributes to vascular inflammation and thrombosis.
  • Platelets play a dual role in complement activation: as activators and targets.
  • Targeting platelet complement pathways may offer therapeutic strategies for thrombotic disorders.