Subendothelial matrix proteins (SEM proteins)

Subendothelial matrix proteins comprise a complex network of extracellular matrix (ECM) components located beneath the vascular endothelial cell layer, primarily consisting of collagen (Types I, III, IV, and VI), von Willebrand factor (vWF), laminin, fibronectin, and proteoglycans. Under normal physiological conditions, these proteins are sequestered from circulating blood by an intact endothelium; however, vascular injury or atherosclerotic plaque rupture exposes the matrix, initiating rapid platelet adhesion and thrombus formation. This process is mediated by the interaction of matrix proteins with platelet receptors such as Glycoprotein VI (GPVI) and the GPIb-IX-V complex. Therapeutic targeting of these proteins, particularly through agents that mask collagen or vWF binding sites, represents a strategic approach to treating arterial thrombosis and atherosclerosis. By focusing on the specific interactions triggered only upon vascular damage, these therapies aim to provide potent antithrombotic effects while minimizing the systemic bleeding risks associated with traditional anticoagulants.

Other names

Subendothelial extracellular matrixVascular subendothelial matrixVascular basement membrane proteinsSubendothelial ECM

Inhibition of platelet adhesion through competitive binding to subendothelial collagen or von Willebrand factor (vWF), or blockade of platelet receptors that interact with these matrix components.