Phosphatidylserine-enriched platelet membrane (PS-enriched platelet membrane) (PS-enriched platelet membrane)

Phosphatidylserine-enriched platelet membranes represent the procoagulant surface formed when activated platelets externalize phosphatidylserine (PS) from the inner to the outer leaflet of the plasma membrane. This process, primarily mediated by the calcium-dependent scramblase TMEM16F, creates a negatively charged scaffold essential for the assembly of the tenase and prothrombinase complexes in the coagulation cascade (Bevers & Williamson, 2016, Physiol Rev). Under normal physiological conditions, PS is sequestered internally by flippases, but its exposure is a hallmark of platelet activation and is critical for rapid thrombin generation (Zwaal & Schroit, 1997, Blood). In pathological states, excessive or premature PS exposure on platelets contributes significantly to arterial and venous thrombosis (Heemskerk et al., 2002, Thromb Haemost). Therapeutic strategies targeting this surface include the use of PS-binding proteins like Annexin A5 for thrombus imaging or anticoagulation, and monoclonal antibodies like Bavituximab designed to block the interaction between PS and clotting factors (Schutters & Reutelingsperger, 2010, Apoptosis). This target is highly valued in drug development for its potential to provide site-specific antithrombotic effects on activated platelets while potentially minimizing systemic bleeding risks.

Other names

Procoagulant platelet surfaceActivated platelet membranePS-exposed platelet membraneAnionic phospholipid surfaceProcoagulant platelet membrane

Binding to exposed anionic phosphatidylserine on the outer leaflet of activated platelets to sterically inhibit the assembly of the tenase and prothrombinase complexes, thereby reducing thrombin generation.