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Related Concept Videos

Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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.
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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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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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Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Phases of Wound Repair01:28

Phases of Wound Repair

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Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
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Related Experiment Video

Updated: Jul 21, 2025

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils
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Plasmin-Mediated Fibrinolysis in Periodontitis Pathogenesis.

L M Silva1,2, K Divaris3,4, T H Bugge2

  • 1Oral Immunity and Infection Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA.

Journal of Dental Research
|July 28, 2023
PubMed
Summary

Fibrin and its breakdown system regulate mucosal homeostasis and immune responses. Plasminogen deficiency increases periodontitis risk, highlighting fibrinolysis's role in periodontal health.

Keywords:
extracellular matrix (ECM)fibrinimmunityinflammationplasminogenproteases/proteinases

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Area of Science:

  • Oral biology
  • Immunology
  • Hemostasis

Background:

  • The hemostatic and inflammatory systems are crucial for maintaining homeostasis at mucosal barriers.
  • Fibrin, a key hemostatic factor, plays significant roles in mucosal homeostasis, wound healing, and inflammation.
  • The fibrinolytic system's role in regulating these processes is increasingly recognized.

Purpose of the Study:

  • To provide an overview of the fibrinolytic system.
  • To discuss fibrin's function as an innate immune regulator.
  • To explore the role of fibrin-neutrophil activation in mucosal and periodontal homeostasis.

Main Methods:

  • Review of the fibrinolytic system and fibrin's role in innate immunity.
  • Analysis of clinical observations in individuals with congenital plasminogen deficiency.
  • Examination of recent genomics studies on plasminogen (PLG) gene polymorphisms and periodontal disease.

Main Results:

  • Congenital plasminogen deficiency is linked to severe childhood periodontitis, indicating a defect in fibrinolysis.
  • Genetic polymorphisms in the PLG gene are significantly associated with common forms of periodontal disease.
  • Fibrin-neutrophil interactions are identified as regulators of mucosal/periodontal homeostasis.

Conclusions:

  • Fibrin plays a critical role in maintaining mucosal and periodontal homeostasis.
  • Defects in fibrinolysis, particularly plasminogen deficiency, predispose individuals to severe periodontitis.
  • PLG gene variants are potential risk indicators for common periodontitis.