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Related Concept Videos

Disorders of Hemostasis01:24

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...
Cytoskeletal Linker Proteins - Plakins01:09

Cytoskeletal Linker Proteins - Plakins

Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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.
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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...
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...

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Related Experiment Video

Updated: Jun 26, 2026

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well
08:01

The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

Published on: February 27, 2026

Plasminogen deficiency.

R Mehta1, A D Shapiro

  • 1Department of Clinical Medicine, Section of Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, USA. ramehta@iupui.edu

Haemophilia : the Official Journal of the World Federation of Hemophilia
|January 15, 2009
PubMed
Summary
This summary is machine-generated.

Plasminogen deficiency causes pseudomembranes and tissue damage, notably ligneous conjunctivitis. While genetic causes are identified, effective treatments for this rare disorder are lacking.

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Published on: September 9, 2012

Area of Science:

  • Genetics
  • Hematology
  • Ophthalmology

Background:

  • Plasminogen deficiency is a recognized disorder characterized by reduced plasminogen levels.
  • This deficiency leads to pseudomembrane formation on mucosal surfaces and subsequent end-organ damage.
  • Ligneous conjunctivitis is the most common clinical manifestation, but other organs can be affected.

Purpose of the Study:

  • To review the clinical manifestations, types, genetic basis, and current treatment limitations of plasminogen deficiency.
  • To highlight the association between hypoplasminogenaemia and pseudomembrane disease.
  • To discuss the therapeutic challenges and potential strategies for managing plasminogen deficiency disorders.

Main Methods:

  • Literature review of plasminogen deficiency.
  • Analysis of clinical presentations, genetic mutations, and epidemiological data.
  • Evaluation of existing and potential therapeutic interventions.

Main Results:

  • Plasminogen deficiency, particularly type I (hypoplasminogenaemia), is linked to pseudomembrane formation.
  • Genetic mutations causing plasminogen deficiency are found in diverse populations, with potential increased prevalence in consanguineous communities.
  • Decreased plasminogen levels may not increase thrombosis risk, contrary to earlier beliefs.

Conclusions:

  • Despite better recognition and measurement of plasminogen levels, effective treatments remain limited.
  • Topical plasminogen concentrate shows efficacy for ligneous conjunctivitis, but systemic or commercial preparations are unavailable.
  • Further research into therapeutic strategies is crucial for managing the clinical manifestations of plasminogen deficiency.