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Related Concept Videos

Complement System01:27

Complement System

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...
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...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Introduction to Hemostasis01:05

Introduction to Hemostasis

Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.

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Thrombin Generation Induced by Complement Component C1q Interaction With the Receptor for the Globular Head of C1q on Adventitial Fibroblasts and Vascular Smooth Muscle Cells.

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Related Experiment Video

Updated: Jun 27, 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

Platelet mediated complement activation.

Ellinor I B Peerschke1, Wei Yin, Berhane Ghebrehiwet

  • 1Department of Pathology, The Mount Sinai School of Medicine, New York, NY 10029, USA.

Advances in Experimental Medicine and Biology
|November 26, 2008
PubMed
Summary

Platelets and microparticles focus complement to vascular injury sites. Dysregulated complement activation contributes to inflammation and thrombosis, impacting host defense mechanisms.

Area of Science:

  • Immunology
  • Vascular Biology
  • Hematology

Background:

  • The complement system is a cascade of proteases and inhibitors crucial for host defense.
  • Immune mechanisms, including complement activation, are increasingly implicated in vascular injury and inflammation.
  • Disseminated intravascular coagulation in massive trauma involves complement activation.

Purpose of the Study:

  • To propose a hypothesis on the role of platelets and microparticles in complement localization at vascular injury sites.
  • To investigate the dual role of complement activation in clearing activated platelets/microparticles and contributing to inflammation/thrombosis.

Main Methods:

  • Literature review and hypothesis formulation based on existing evidence.
  • Analysis of the role of platelets in hemostasis and thrombosis.

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

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

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Last Updated: Jun 27, 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

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

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
05:49

Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

  • Review of studies demonstrating complement components in atherosclerotic and thrombotic vascular lesions.

    • Main Results:

    • Platelets and platelet-derived microparticles are proposed to concentrate complement at vascular injury sites.
    • Regulated complement activation aids in clearing terminally activated platelets and microparticles.
    • Dysregulated complement activation is linked to inflammation and thrombosis in vascular lesions.

    Conclusions:

    • Complement system activation, focused by platelets, plays a critical role in vascular injury.
    • Both beneficial (clearance) and detrimental (inflammation, thrombosis) roles of complement are highlighted.
    • Understanding this interplay is crucial for managing vascular inflammatory and thrombotic conditions.