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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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Related Experiment Video

Updated: Jul 19, 2025

Author Spotlight: High-Sensitivity Tissue Factor Activity Assay for Plasma Diagnosis
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Author Spotlight: High-Sensitivity Tissue Factor Activity Assay for Plasma Diagnosis

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Tissue factor as a potential coagulative/vascular marker in relapsing-remitting multiple sclerosis.

Tatiana Koudriavtseva1,2, Svetlana Lorenzano3, Maria Cellerino2,4

  • 1Medical Direction, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Regina Elena National Cancer Institute, Rome, Italy.

Frontiers in Immunology
|August 16, 2023
PubMed
Summary

Tissue-Factor is a key biomarker in multiple sclerosis (MS) pathogenesis, differentiating MS patients from controls and relapse from remission. It also correlates with brain hemodynamic changes, suggesting its potential as a therapeutic target.

Keywords:
biomarkercoagulationmultiple sclerosisrelapsetissue factor

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Area of Science:

  • Neurology
  • Immunology
  • Hematology

Background:

  • Multiple sclerosis (MS) is an inflammatory, demyelinating, and degenerative disease of the central nervous system.
  • Emerging evidence suggests a role for coagulation pathways in MS pathogenesis.

Purpose of the Study:

  • To identify specific pro-coagulative/vascular factors in MS.
  • To correlate these factors with brain hemodynamic abnormalities in MS patients.

Main Methods:

  • Compared serum/plasma levels of coagulation/vascular factors, vitamins, and lymphocytes in MS patients (remission/relapse) and controls.
  • Assessed brain hemodynamic metrics using 3T-MRI.
  • Utilized Partial Least Squares Discriminant Analysis to model relationships.

Main Results:

  • Multiple sclerosis patients showed higher Body-Mass-Index, Protein-C, and activated-C9 compared to controls.
  • Tissue-Factor, Tie-2, and P-Selectin were lower in relapse vs. remission.
  • Lower cerebral blood volume and flow were observed in relapsing MS patients.
  • Tissue-Factor correlated negatively with mean-transit-time in gadolinium-enhancing lesions.

Conclusions:

  • Tissue-Factor is a significant discriminator between MS and controls, and between relapse and remission.
  • Tissue-Factor shows potential as a biomarker for MS and a therapeutic target in relapsing-remitting MS.