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Related Concept Videos

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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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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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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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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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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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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.
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Updated: Jul 1, 2025

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Can complement activation be the missing link in antiphospholipid syndrome?

Veronica Venturelli1,2,3, Beatrice Maranini1, Ibrahim Tohidi-Esfahani4,5

  • 1Rheumatology Unit, Department of Medical Sciences, Università degli Studi di Ferrara, Azienda, Ospedaliero-Universitaria S. Anna, Cona, Italy.

Rheumatology (Oxford, England)
|March 14, 2024
PubMed
Summary
This summary is machine-generated.

Antiphospholipid syndrome (APS) involves complement activation, crucial for disease severity and treatment resistance. Further research into complement inhibition could personalize APS therapies and improve patient outcomes.

Keywords:
antiphospholipid antibodiesantiphospholipid syndromecoagulationcomplementpregnancy outcomesthrombosis

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Area of Science:

  • Immunology
  • Rheumatology
  • Autoimmune Diseases

Background:

  • Antiphospholipid syndrome (APS) is a serious autoimmune disorder with a high risk of blood clots and treatment failure.
  • While complement activation is implicated in obstetric APS, its precise role in thrombotic APS and disease severity requires further investigation.

Purpose of the Study:

  • To review current knowledge on complement activation in APS pathogenesis.
  • To explore the potential role of platelet-mediated complement activation in APS.
  • To discuss clinical implications and therapeutic strategies, including complement inhibition.

Main Methods:

  • Literature review of current findings on complement activation in APS.
  • Discussion of mechanistic studies and clinical trial data.
  • Analysis of platelet-mediated complement activation pathways.

Main Results:

  • Complement activation is increasingly recognized in APS, particularly obstetric cases.
  • The exact contribution of complement to thrombotic APS and disease severity remains unclear.
  • Platelet-mediated complement activation is a potential area for further study.

Conclusions:

  • Understanding complement activation is key to identifying novel severity markers and improving risk stratification in APS.
  • Complement inhibition shows promise as an adjunctive therapy for APS.
  • Further mechanistic studies and clinical trials are needed to evaluate complement-targeted treatments.