Platelet factor 4

Platelet factor 4 (PF4) is a small cytokine belonging to the chemokine family that is released from the alpha granules of activated platelets during platelet aggregation.

Function

PF4 is known to play a role in coagulation and inflammation. It binds to heparin, neutralizing its anticoagulant effect, and is involved in the regulation of thrombosis. PF4 also has a role in wound healing and angiogenesis.

Clinical significance

PF4 is implicated in heparin-induced thrombocytopenia (HIT), a condition where antibodies form against the PF4-heparin complex, leading to a pro-thrombotic state. It is also being studied for its potential role in cancer and atherosclerosis.

Structure

PF4 is a member of the CXC chemokine family and is encoded by the PF4 gene located on chromosome 4 in humans. It is a tetrameric protein with a molecular weight of approximately 7.8 kDa.

Interactions

PF4 interacts with various cell surface receptors and proteins, influencing cell signaling pathways involved in immune response and cell migration.

See also

• Chemokine
• Platelet
• Heparin-induced thrombocytopenia

External links

• Platelet factor 4 on WikiMD