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Related Concept Videos

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.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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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
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...
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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

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.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Introduction to Hemostasis01:05

Introduction to Hemostasis

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized,...
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Related Experiment Video

Updated: Jun 8, 2025

Murine Model of Femoral Artery Wire Injury with Implantation of a Perivascular Drug Delivery Patch
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Murine Model of Femoral Artery Wire Injury with Implantation of a Perivascular Drug Delivery Patch

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Complement factor B, not the membrane attack complex component C9, promotes neointima formation after arterial wire

Ziyi Guo1, Yuze Zhang1, Zekun Peng1

  • 1State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China.

Atherosclerosis
|November 5, 2024
PubMed
Summary

Complement factor B (fB) drives neointima formation after artery injury by promoting smooth muscle cell proliferation. Targeting fB may prevent restenosis after angioplasty.

Keywords:
Complement factor 9Complement factor BNeointima formationSmooth muscle cellsVascular injury

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A Murine Model of Arterial Restenosis: Technical Aspects of Femoral Wire Injury
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Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Complement System

Background:

  • Vascular restenosis, a complication of angioplasty, involves neointima hyperplasia.
  • The complement system is implicated in the development of restenosis.
  • Complement factor B (fB) is crucial for the alternative complement pathway.

Purpose of the Study:

  • To investigate the role of complement factor B (fB) in neointima formation after vascular injury.
  • To determine if fB contributes to smooth muscle cell proliferation and migration in restenosis.

Main Methods:

  • Wire-induced angioplasty in mice deficient in fB or C9 compared to controls.
  • Assessment of neointima formation and vascular smooth muscle cell (SMC) and endothelial cell (EC) behavior in vitro.
  • Analysis of fB expression in human and mouse stenotic arteries.

Main Results:

  • fB deficiency significantly reduced neointima area and intima-to-media ratio post-injury.
  • Vascular SMC-expressed fB, not circulating fB, was essential for SMC proliferation and migration.
  • Deletion of C9 did not impact neointima formation, suggesting fB acts independently of the membrane-attacking complex.

Conclusions:

  • Complement factor B (fB) promotes neointima formation following artery injury.
  • fB-dependent SMC proliferation and migration contribute to restenosis, independent of the membrane-attacking complex.
  • Targeting fB presents a potential therapeutic strategy to prevent restenosis after percutaneous coronary intervention.