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Related Concept Videos

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...
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...
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...
Coagulation01:09

Coagulation

The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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...
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...

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Related Experiment Video

Updated: Jul 12, 2026

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

Blood platelets activate the classical pathway of human complement.

E I B Peerschke1, W Yin, S E Grigg

  • 1Department of Pathology and Laboratory Medicine, Weill Medical College of Cornell University, New York, NY, USA. epeersch@med.cornell.edu

Journal of Thrombosis and Haemostasis : JTH
|September 12, 2006
PubMed
Summary
This summary is machine-generated.

Platelets activate the classical complement pathway via C1q, a process enhanced by platelet stimulation. This finding suggests a role for platelet C1q binding protein (gC1qR/p33) in complement activation during vascular injury.

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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

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

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Related Experiment Videos

Last Updated: Jul 12, 2026

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

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

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

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

Area of Science:

  • Immunology
  • Hematology
  • Vascular Biology

Background:

  • Complement system activation is crucial in inflammation following vascular injury.
  • Platelets are increasingly recognized for their role beyond hemostasis, including in inflammatory processes.
  • Previous research indicated platelet P-selectin activates complement's alternative pathway; platelets also bind C1q, the classical pathway's recognition unit.

Purpose of the Study:

  • To investigate the potential for classical complement pathway activation on the surface of platelets.
  • To explore the role of platelet C1q binding protein (gC1qR/p33) in this process.

Main Methods:

  • Complement activation assessed using enzyme-linked immunosorbent assay (ELISA) and flow cytometry.
  • Measurement of C1q, C4d, and C3a deposition on platelets.
  • Utilized purified systems with recombinant gC1qR/p33 and C1q.

Main Results:

  • Demonstrated significant increases in C1q and C4d deposition on platelets exposed to human plasma or serum.
  • Observed C1q-dependent C4 cleavage, confirming classical pathway activation.
  • Showed enhanced C4 activation with platelet stimulation (chemical/mechanical) and decreased activation with plasmin, linked to gC1qR/p33 expression.

Conclusions:

  • Provided the first evidence for C1q-dependent classical complement pathway activation on platelets.
  • Indicated a role for platelet gC1qR/p33 in classical complement activation.
  • Suggested additional platelet membrane factors may be involved, necessitating further investigation.