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see blood clottingblood clotting,
process by which the blood coagulates to form solid masses, or clots. In minor injuries, small oval bodies called platelets, or thrombocytes, tend to collect and form plugs in blood vessel openings.
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a protein of high molecular weight formed by the action of the enzyme thrombin on blood plasma fibrogen; it is composed of smooth or transversely striated fibers, agglomerations of which form the basis of the thrombus occurring when blood coagulates.

Fibrin is formed in three stages. In the first stage, two peptides A (molecular weight approximately 2,000) and two peptides B (molecular weight approximately 2,500) split off from the fibrinogen molecule by the action of thrombin, forming the fibrin monomer, which is constructed of two identical subunits joined by disulfide bonds. Each of the subunits consists of three dissimilar polypeptide chains, which are designated α, β, and γ.

In the second stage, the fibrin monomer spontaneously converts to a clot, which is called a fibrin aggregate, or nonstabilized fibrin. The aggregation of the fibrin monomer (the self-assembly of fibrin fibers) includes the transition of the molecule from the globular state to the fibrillary state. Hydrogen and electrostatic bonds and forces of hydrophobic interaction, which may be weakened in concentrated solutions of urea and other denaturing agents, participate in the formation of the fibrin aggregate. This process leads to the reconstitution of the fibrin monomer. The formation of the fibrin aggregate is accelerated by substances that carry a positive charge, such as calcium ions and protamine sulfate, and is inhibited by negatively charged compounds, such as heparin.

In the third stage the fibrin aggregate undergoes changes caused by the enzymatic action of the fibrin-stabilizing factor XIIIa, or fibrinase. Through the action of this factor, stable covalent bonds are formed between the γ- and α-polypeptide chains of fibrin-aggregate molecules, as a result of which the fibrin aggregate is stabilized as a fibrin polymer that is insoluble in concentrated solutions of urea. In cases of congenital or acquired insufficiency of factor XIIIa in the body and in certain diseases, the fibrin aggregate is not stabilized as a fibrin polymer, resulting in hemorrhagic diatheses.

Fibrin is obtained by rinsing and drying a blood clot. It is used to prepare sterile sponges and films for stopping hemorrhages from small vessels during various surgical operations.


Belitser, V. A., and T. V. Varetskaia. “Fibrinogen i fibrin: stroenie molekul, samosborka volokon.” Uspekhi sovremennoi biologii, 1975, vol. 80, issue 1(4).



The fibrous, insoluble protein that forms the structure of a blood clot; formed by the action of thrombin.


a white insoluble elastic protein formed from fibrinogen when blood clots: forms a network that traps red cells and platelets
References in periodicals archive ?
Fibrinogen is initially concentrated in the high part of the tube, before the circulating thrombin transforms it into fibrin. [3]
DD levels (0.56 [micro]g/mL and 0.044 [micro]g/mL) were also higher in the bacterial pneumonia patients (p=0.046);however, other fibrinolytic marker FDPs and fibrin monomers were not significantly different (Table II).
It is a fibrin matrix in which platelet, cytokines, and cells are entrapped.
Comparative evaluation of platelet-rich fibrin and mineral trioxide aggregate as pulpotomy agents in permanent teeth with incomplete root development: a randomized controlled trial.
The effect of the fibrin matrix structure on angiogenesis may be explained by a three-dimensional fibrin gel structure and by the simultaneous activation of the cytokines it contains.
The impact of the centrifuge characteristics and centrifugation protocols on the cells, growth factors, and fibrin architecture of a leukocyte- and platelet-rich fibrin (L-PRF) clot and membrane.
Crul, "Epidural fibrin glue injection stops persistent cerebrospinal fluid leak during long-term intrathecal catheterization," Anesthesia & Analgesia, vol.
Sammartino, "Influence of leukocyte- and platelet-rich fibrin (L-PRF) in the healing of simple postextraction sockets: a split-mouth study," BioMed Research International, vol.
Group one received treatment with fibrin glue seeded with ASCs, group two received ASCs injected with PBS, and group three received fibrin glue alone.
Maximal fibrin clot strength in platelet-poor plasma (plasma TEG-MA) was higher among subjects with diabetes as compared to nondiabetics (37.0 [+ or -] 8 versus 34.1 [+ or -] 8 mm; p < 0.001) (Table 2, Figure 1).
A sample size of 20 was estimated to be necessary for a study investigating the ability of autologous fibrin glue and PGA sheets to prevent bleeding after gastric ESD in patients receiving antithrombotic therapy.
Fibrin sealants have been present in surgical practice since the 1970s, with both hemostatic and adhesive properties.