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Related Concept Videos

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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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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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Disorders of Hemostasis01:24

Disorders of Hemostasis

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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.
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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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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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Related Experiment Video

Updated: Jul 15, 2025

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Complement inhibition can decrease the haemostatic response in a microvascular bleeding model at multiple levels.

Murielle Golomingi1, Jessie Kohler1, Christina Lamers2

  • 1Experimental Haemostasis Group, Department for BioMedical Research (DBMR), University of Bern, Bern, Switzerland.

Frontiers in Immunology
|September 29, 2023
PubMed
Summary
This summary is machine-generated.

The complement system plays a role in hemostasis, influencing clot formation and platelet activation during vessel injury. Inhibiting complement pathways significantly impacts these processes, suggesting therapeutic potential.

Keywords:
MBL-associated serine protease-2 (MASP-2)complement C1scomplement C3complement C5complement factor D (FD)complement systemhaemostasismicrofluidics

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Area of Science:

  • Immunology
  • Hematology
  • Thrombosis

Background:

  • Hemostasis, the process of stopping bleeding, involves platelet plug formation and fibrin mesh stabilization via the coagulation cascade.
  • Interactions between the complement and coagulation systems can exacerbate thromboinflammation in disease.
  • The precise role of complement in physiological hemostasis following vessel injury remains unclear.

Purpose of the Study:

  • To investigate the role of complement components and activation in the hemostatic response to mechanical vessel injury.
  • To explore the effects of various complement inhibitors on clot formation and platelet activation.

Main Methods:

  • Utilized a microvascular bleeding model with human endothelial cells and whole blood.
  • Introduced mechanical injury to simulate vessel damage.
  • Administered complement inhibitors targeting lectin (MASP-1, MASP-2), classical (C1s), alternative (FD), and common (C3, C5) pathways, plus a triple inhibitor (TriFu).
  • Quantified fibrin deposition and platelet activation marker (CD62P) in real-time using confocal microscopy.

Main Results:

  • Inhibitors of MASP-2 or C1s showed no significant effect on fibrin formation.
  • Alternative pathway inhibition (FD) significantly reduced platelet activation.
  • Common pathway inhibitors (C3, C5) substantially reduced fibrin formation and C3 inhibition also reduced platelet activation.
  • Triple inhibition (TriFu) reduced both fibrin formation and platelet activation.
  • TriFu, MASP-1, and C3 inhibitors demonstrated the strongest effects on clot formation.

Conclusions:

  • Complement system activation influences hemostasis by affecting fibrin clot formation and platelet activation.
  • Modulators targeting different complement pathways exhibit distinct effects on hemostasis.
  • Complement-coagulation interactions may have evolved to aid hemostasis but can promote thrombosis in pathological states.