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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...
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...
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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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...
Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...

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Related Experiment Video

Updated: Jun 27, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Interaction between the coagulation and complement system.

Umme Amara1, Daniel Rittirsch, Michael Flierl

  • 1Department of Traumatology, Hand-, Plastic-, and Reconstructive Surgery, University Hospital of Ulm, Ulm, Germany.

Advances in Experimental Medicine and Biology
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

The coagulation system activates the complement system, generating inflammatory anaphylatoxins C5a and C3a. These interactions reveal new pathways in innate immunity and hemostasis post-injury.

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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
08:26

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Published on: March 29, 2010

Related Experiment Videos

Last Updated: Jun 27, 2026

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
06:29

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
08:26

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Published on: March 29, 2010

Area of Science:

  • Immunology
  • Hematology
  • Biochemistry

Background:

  • The complement system (innate immunity) and coagulation system (hemostasis) are crucial after injury.
  • Interactions between these systems are known but precise molecular pathways remain unclear.

Purpose of the Study:

  • To investigate the effects of coagulation factors on complement activation.
  • To elucidate the molecular mechanisms of complement and coagulation system interplay.
  • To determine the generation and biological activity of anaphylatoxins.

Main Methods:

  • In vitro experiments investigating coagulation factors (FXa, FXIa, plasmin, thrombin) on complement components (C3, C5).
  • Detection of anaphylatoxins (C5a, C3a) using immunoblotting and ELISA.
  • Assessment of anaphylatoxin biological activity via neutrophil and HMC-1 cell chemotaxis assays.
  • Inhibition studies using serine protease inhibitors (aprotinin, leupeptin).

Main Results:

  • Coagulation factors FXa, FXIa, and plasmin cleave C3 and C5, generating C3a and C5a.
  • Generated C3a and C5a exhibit biological activity, inducing chemotaxis in immune cells.
  • Thrombin cleaves C5 and also C3a generated in vitro.
  • Plasmin-induced cleavage is inhibited by serine protease inhibitors.

Conclusions:

  • Serine proteases of the coagulation system can activate the complement cascade via non-canonical pathways.
  • Functional anaphylatoxins C5a and C3a are generated, contributing to inflammatory responses.
  • This highlights a significant crosstalk between coagulation and complement systems.