fibrinogen is a vital glycoprotein produced by the liver that plays a central role in blood clot formation. it circulates in the plasma as a soluble protein and is converted by thrombin into insoluble fibrin strands, which weave into a mesh to stabilize blood clots. fibrinogen is also involved in inflammation, wound healing, and acts as a binding agent for platelets.
chemical properties
- molecular weight: ~340 kDa
- structure: composed of three pairs of polypeptide chains (Aα, Bβ, and γ)
- synthesis site: liver
- plasma concentration: normally 2–4 g/L in healthy individuals
- chemical formula: complex protein; not represented by a simple formula
usefulness in medicine
- fibrinogen is essential for the final step in the coagulation cascade—forming the fibrin clot.
- levels are measured to assess bleeding disorders, liver disease, inflammation, and cardiovascular risk.
- elevated fibrinogen is a marker of systemic inflammation and linked to heart disease, stroke, and cancer.
- low fibrinogen (hypofibrinogenemia) can result in poor clot formation and excessive bleeding.
- used in clinical settings as fibrinogen concentrate or cryoprecipitate to treat patients with bleeding complications or massive hemorrhage.
antibacterial and antimicrobial activity
- fibrinogen contributes to host defense by promoting clot formation that limits pathogen spread.
- fibrin can trap bacteria at the site of infection and aid in immune cell recruitment.
- certain pathogens interact with fibrinogen to evade the immune system, making it relevant in host-pathogen interactions.
- research highlights: