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Related Concept Videos

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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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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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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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.
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
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Factor XIII and inflammatory cells.

Zsuzsa Bagoly1, Eva Katona, László Muszbek

  • 1Clinical Research Center University of Debrecen, Medical and Health Science Center, Debrecen, Hungary.

Thrombosis Research
|March 20, 2012
PubMed
Summary
This summary is machine-generated.

Coagulation factor XIII (FXIII) interacts with immune cells like leukocytes and macrophages. This review explores FXIII

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Area of Science:

  • Immunology
  • Hematology
  • Biochemistry

Background:

  • Factor XIII (FXIII) is a key coagulation factor with known hemostatic functions.
  • Emerging evidence suggests FXIII also plays roles beyond traditional hemostasis, particularly within the immune system.

Purpose of the Study:

  • To review the relationship between coagulation factor XIII (FXIII) and immune system cells.
  • To summarize the structure, functions, and immune cell interactions of FXIII.

Main Methods:

  • Literature review summarizing existing research on FXIII and immune cells.
  • Discussion of FXIII structure, plasma and cellular functions.
  • Analysis of FXIII interactions with leukocytes, monocytes, and macrophages.

Main Results:

  • FXIII activation by neutrophil elastase and downregulation by granulocyte proteases are discussed.
  • FXIIIa's effects on leukocytes are examined.
  • FXIII expression, distribution, and changes during monocyte differentiation and activation are summarized.

Conclusions:

  • FXIII exhibits significant interactions with various immune cells, including leukocytes, monocytes, and macrophages.
  • Cellular FXIII has potential functions within monocytes and macrophages that warrant further investigation.