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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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...

Clot Retraction and Fibrinolysis

Clot Retraction and Fibrinolysis

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.

Extrinsic and Intrinsic Pathways of Hemostasis

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...

Disorders of Hemostasis

Disorders of Hemostasis

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.

Amyloid Fibrils

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...

Coagulation

Coagulation

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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Related Experiment Video

Updated: May 15, 2025

Experimental and Imaging Techniques for Examining Fibrin Clot Structures in Normal and Diseased States

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Published on: April 1, 2015

Fibrinogen Oxidation and Thrombosis: Shaping Structure and Function.

Francesca Nencini¹, Elvira Giurranna¹, Serena Borghi¹

¹Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Firenze, Viale Morgagni 50, 50134 Firenze, Italy.

Antioxidants (Basel, Switzerland)

|April 29, 2025

Summary

Oxidative stress alters fibrinogen, leading to denser, more resistant blood clots and increasing thrombotic risk in diseases. Understanding this interaction may reveal new antioxidant therapies for cardiovascular conditions.

Keywords:

fibrinogen oxidation oxidative stress post-translational modifications thrombosis

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Area of Science:

Biochemistry
Hematology
Pathophysiology

Background:

Fibrinogen is crucial for hemostasis, forming the fibrin clot structure.
Oxidative stress, an imbalance of reactive oxygen species (ROS) and antioxidants, modifies fibrinogen's structure and function.
Altered fibrinogen impacts not only coagulation but also immune responses, inflammation, and tissue repair.

Purpose of the Study:

To review the impact of fibrinogen oxidation on clot formation, architecture, and degradation.
To synthesize findings from in vitro, ex vivo, and clinical studies on fibrinogen oxidation.
To explore potential therapeutic strategies targeting oxidative stress in relation to fibrinogen function.

Main Methods:

Narrative review of existing scientific literature.
Synthesis of data from in vitro, ex vivo, and clinical studies.
Analysis of the effects of oxidative stress on fibrinogen structure and clot properties.

Main Results:

Fibrinogen oxidation yields denser fibrin clots with thinner fibers, reduced permeability, and increased resistance to fibrinolysis.
These changes are linked to prothrombotic states in cardiovascular diseases, diabetes, inflammation, and cancer.
Low-dose oxidative stress might induce protective adaptations in fibrinogen, preserving its function, but findings vary due to experimental differences.

Conclusions:

Fibrinogen oxidation significantly impacts clot structure and function, contributing to thrombotic risks in various diseases.
Targeting oxidative stress or specific oxidation sites on fibrinogen may offer novel therapeutic avenues.
Further research is needed to elucidate specific oxidation mechanisms and translate findings into clinical practice.