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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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Formation of the Platelet Plug01:22

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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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Structure and Function of Platelets01:18

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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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Antimicrobial Proteins01:23

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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
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Overview
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Introduction to Hemostasis01:05

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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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Related Experiment Video

Updated: Apr 14, 2026

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

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Complement and platelets: Mutual interference in the immune network.

Cornelia Speth1, Günter Rambach1, Reinhard Würzner1

  • 1Division of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria.

Molecular Immunology
|April 19, 2015
PubMed
Summary
This summary is machine-generated.

Platelets are now recognized as immune cells, not just for clotting. This review explores their complex interactions with the complement system and implications for diseases and treatments.

Keywords:
Autoimmunity and inflammatory disordersBiomaterialsComplementImmune networkInfectious diseasesInnate immunityPlatelets

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Area of Science:

  • Immunology
  • Hematology
  • Innate Immunity

Background:

  • Platelets, traditionally known for hemostasis, are increasingly recognized for their immunological functions.
  • The complement system is a key component of soluble innate immunity with diverse roles.
  • Platelets and complement interact significantly within the immune network.

Purpose of the Study:

  • To review the intricate relationship between platelets and the complement system.
  • To elucidate the molecular mechanisms underlying their mutual regulation.
  • To highlight the clinical relevance of platelet-complement interactions.

Main Methods:

  • Literature review of current research on platelet-complement interactions.
  • Analysis of molecular mechanisms governing their interplay.
  • Synthesis of findings related to disease pathology and therapeutic applications.

Main Results:

  • Platelets and complement exhibit complex bidirectional communication.
  • Molecular crosstalk influences immune responses and inflammation.
  • These interactions are implicated in infectious, inflammatory, and autoimmune diseases.

Conclusions:

  • The interplay between platelets and complement is crucial for immune homeostasis and pathology.
  • Understanding these interactions offers potential therapeutic targets.
  • Further research is needed to fully harness this knowledge for clinical benefit.