Related Experiment Video
Updated: Jun 19, 2026
09:38
A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
Published on: February 14, 2017
ON THE NATURE OF FORCES OPERATING IN BLOOD CLOTTING : I. THE PARTICIPATION OF ELECTROSTATIC ATTRACTION
1Hungarian Biological Research Institute, Tihany, Hungary.
The Journal of General Physiology
|October 30, 2009
Summary
Neutral salts inhibit fibrinogen clotting by thrombin, with inhibition increasing with anion size and charge, and cation charge. This suggests a coacervation process driven by electrostatic interactions in blood clotting.
Area of Science:
- Biochemistry
- Physical Chemistry
- Hematology
Background:
- Fibrinogen clotting by thrombin is a critical step in hemostasis.
- The influence of neutral salts on this process is not fully understood.
- Understanding these interactions can elucidate the mechanisms of blood coagulation.
Purpose of the Study:
- To investigate the inhibitory effects of various neutral salts on fibrinogen clotting by thrombin.
- To determine the relationship between salt properties (ionic radius, charge, valency) and their inhibitory activity.
- To explore the underlying mechanism of fibrinogen-thrombin interaction.
Main Methods:
- Systematic study of neutral salt inhibition on fibrinogen clotting.
- Varying cations (K+, Na+, Mg2+, Ca2+, Sr2+, Ba2+) and anions (Cl-, Br-, I-).
- Analysis of salt properties including ionic radius and charge valency.
Main Results:
- Weak inhibition by NaCl and KCl.
- Increased inhibition with larger monovalent anions (Cl- < Br- < I-).
- Increased inhibition with higher anion charge (1- < 1-2 < 1-3 < 1-4).
- Stronger inhibition with higher cation charge (K+, Na+ < Mg2+, Ca2+, Sr2+, Ba2+).
- Greater inhibition with larger cations of the same charge and anion (e.g., alkali earths).
Conclusions:
- Neutral salt inhibition of fibrinogen clotting by thrombin is concentration-dependent.
- The results strongly suggest a coacervation process mediated by electrostatic attractions.
- This coacervation involves interactions between positive and negative groups in fibrinogen and thrombin.
Related Concept Videos
01:20Extrinsic 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...
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...
01:16Clot 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.
01:30Coulomb's Law
Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved.
Newton's third law applies to the Coulomb force — the force on...
Newton's third law applies to the Coulomb force — the force on...
01:09Coagulation
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...
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...
01:06Coagulation
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
01:22Formation 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.
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...
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...