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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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Phases of Wound Repair01:28

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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.
Formation of Blood Clot
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Vascular Spasm01:16

Vascular Spasm

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The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last...
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Clinical Applications of Epidermal Stem Cells01:19

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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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.
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Related Experiment Video

Updated: Oct 3, 2025

Visualizing Scar Development Using SCAD Assay - An Ex-situ Skin Scarring Assay
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Visualizing Scar Development Using SCAD Assay - An Ex-situ Skin Scarring Assay

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Contracting scars from fibrin drops.

Stephen Robinson1,2, Eric Parigoris1,2, Jonathan Chang1,2

  • 1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory School of Medicine, Atlanta, GA, USA.

Integrative Biology : Quantitative Biosciences From Nano to Macro
|February 20, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel microscale model for assessing fibrosis, using cell-contracted collagen spheroids to visualize scar formation. The model effectively evaluates antifibrotic drugs, demonstrating sensitivity in detecting drug efficacy for fibrotic diseases.

Keywords:
collagenfibrinfibrinolysisfibroplasiafibrosisphenotypic assaywound healing

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Drug Discovery

Background:

  • Fibrosis is a pathological process characterized by excessive extracellular matrix (ECM) deposition.
  • Current in vitro models for studying fibrosis and evaluating antifibrotic drugs have limitations.
  • A need exists for sensitive and visually quantifiable assays to assess fibrotic responses.

Purpose of the Study:

  • To develop and validate a microscale fibroplasia and contraction model for studying fibrosis.
  • To utilize the model for evaluating the efficacy of antifibrotic drugs.
  • To establish a convenient visual readout for assessing the extent of fibrosis.

Main Methods:

  • A microscale model using fibrin-embedded lung fibroblasts was created via aqueous two-phase microprinting.
  • Cell-laden fibrin microgel drops were formed, allowing cells to deposit ECM and degrade fibrin.
  • The model was stimulated with transforming growth factor-beta 1 (TGF-β1) and treated with antifibrotic drugs (nintedanib, pirfenidone, TM5275).

Main Results:

  • Cells contracted the collagen-rich matrix to form compact cell-ECM spheroids, with size serving as a visual readout of fibroplasia.
  • TGF-β1 stimulation induced excessive scarring, evidenced by increased collagen production and larger spheroids.
  • Antifibrotic drugs significantly reduced spheroid size, indicating reduced fibrosis.

Conclusions:

  • The microscale fibroplasia and contraction model provides a sensitive and visual method for assessing fibrosis.
  • The assay is effective for evaluating antifibrotic drug efficacy, even at submillimolar concentrations.
  • This approach has broad potential for studying various fibrotic diseases and therapeutics.