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Related Concept Videos

Complement System01:27

Complement System

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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...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
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Introduction to Hemostasis01:05

Introduction to Hemostasis

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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.
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Clot Retraction and Fibrinolysis01:16

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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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Coagulation01:09

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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.
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Coagulation01:06

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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...
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Updated: Dec 12, 2025

Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion
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Evaluation of the Interplay Between the Complement Protein C1q and Hyaluronic Acid in Promoting Cell Adhesion

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Complement C1q Enhances Primary Hemostasis.

Claudia Donat1, Robert Kölm1, Kinga Csorba1

  • 1Laboratory of Clinical Immunology, Department of Biomedicine, University of Basel, Basel, Switzerland.

Frontiers in Immunology
|August 9, 2020
PubMed
Summary
This summary is machine-generated.

Complement C1q protein is crucial for primary hemostasis, promoting blood clotting. C1q deficiency in mice led to prolonged bleeding, highlighting its role in preventing blood loss.

Keywords:
bleeding timecoagulationcomplement C1qcomplement systemhemostasisthrombosisvon Willebrand factor

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Area of Science:

  • Immunology
  • Hematology

Background:

  • The interplay between the complement system and hemostasis is increasingly recognized.
  • Complement C1q and von Willebrand factor (vWF) interact, influencing platelet adhesion in vitro.
  • Impaired hemostasis in vWF disorders suggests C1q's potential role in hemostasis.

Purpose of the Study:

  • To investigate the in vivo significance of C1q binding to vWF in hemostasis.
  • To analyze primary and secondary hemostasis parameters and bleeding tendencies in C1q-deficient mice.

Main Methods:

  • Comparative analysis of hemostasis parameters in wild-type (WT) and C1q-deficient (C1qa-/-) mice.
  • Bleeding time and blood loss quantification in WT and C1qa-/- mice.
  • Reconstitution experiments in C1qa-/- mice to assess C1q's effect.

Main Results:

  • No significant differences in blood counts or vWF levels between WT and C1qa-/- mice.
  • Platelets from both mouse strains exhibited normal aggregation.
  • C1qa-/- mice showed prolonged tail bleeding times and increased blood loss compared to WT mice.
  • Reconstitution with C1q reversed the bleeding phenotype in C1qa-/- mice.

Conclusions:

  • C1q actively contributes to primary hemostasis by promoting bleeding arrest.
  • This finding may inform understanding of thromboembolic complications in inflammatory conditions with C1q deposition.