Platelet glycoprotein Ib-IX-V receptor complex (GPIb-IX-V) (GPIb-IX-V)

The Platelet glycoprotein Ib-IX-V receptor complex is a multi-subunit adhesion receptor essential for platelet tethering and rolling on the vascular subendothelium. It is composed of four distinct glycoproteins: GPIbα, GPIbβ, GPIX, and GPV, which assemble in a 2:4:2:1 stoichiometry on the platelet surface (UniProt P07359). The GPIbα subunit is the most critical component, housing the binding sites for von Willebrand factor (vWF), thrombin, P-selectin, and integrin αMβ2 (PubMed: 29433110). This receptor complex is unique because it initiates platelet adhesion under the high shear forces characteristic of arterial blood flow, a process that is fundamental to both normal hemostasis and pathological thrombosis (StatPearls: NBK538215). Genetic mutations resulting in the absence or dysfunction of the complex cause Bernard-Soulier syndrome, a severe bleeding disorder, while its role in thrombus stabilization makes it a high-value target for anti-thrombotic therapy (PubMed: 31550194). Current pharmacological strategies focus on inhibiting the GPIbα-vWF interaction to treat conditions like ischemic stroke and myocardial infarction. Drugs such as anfibatide, a direct GPIbα antagonist, and caplacizumab, which targets the vWF A1 domain to prevent receptor binding, represent the clinical advancement of this target (PubMed: 30625055).

Other names

CD42 complexvon Willebrand factor receptorGlycoprotein Ib alpha subunitGP Ib-alphaGP Ib-betaGP IXGP VCD42b-c-a-d

Inhibition of the interaction between von Willebrand factor (vWF) and the glycoprotein Ib-alpha (GPIbα) subunit, thereby preventing platelet tethering and adhesion to the vascular subendothelium under high shear stress conditions.