Cross-linked fibrin D-dimer (D-dimer)

Cross-linked fibrin D-dimer is a specific protein fragment produced during the degradation of a blood clot by the enzyme plasmin (StatPearls, 2023). It is characterized by a unique neo-epitope created when Factor XIIIa cross-links the gamma chains of fibrin molecules during the coagulation cascade (Journal of Biological Chemistry, 1973). This specific epitope is absent in circulating fibrinogen and non-cross-linked fibrin, making it a highly specific target for molecular imaging and targeted therapy of thromboembolic diseases (Circulation, 2007). In clinical practice, D-dimer levels are widely used as a biomarker to rule out venous thromboembolism and monitor disseminated intravascular coagulation (NIH, 2022). Beyond diagnostics, the D-dimer epitope serves as a docking site for specialized contrast agents, such as EP-2104R, and experimental thrombolytic drugs designed to concentrate at the site of a thrombus (Nature Reviews Cardiology, 2009). This targeting strategy aims to improve the sensitivity of clot detection and enhance the efficacy of clot dissolution while minimizing systemic side effects like hemorrhage (Thrombosis Research, 2015).

Other names

Fibrin D-dimerCross-linked fibrin degradation productXDPD-dimer epitopeFibrin fragment D-dimer

Binding to the specific neo-epitope formed by the Factor XIIIa-mediated covalent cross-linking of the D-domains in fibrin, which is present in thrombi but absent in circulating fibrinogen (Circulation, 2007).