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  • Title: The monoclonal antibody that recognizes an epitope in the C-terminal region of the fibrinogen alpha-chain reacts with soluble fibrin and fibrin monomer generated by thrombin but not with those formed as plasmin degradation products.
    Author: Suzuki A, Ebinuma H, Matsuo M, Miyazaki O, Yago H.
    Journal: Thromb Res; 2007; 121(3):377-85. PubMed ID: 17561232.
    Abstract:
    INTRODUCTION: The presence of soluble fibrin (SF) provides evidence of thrombin activation in the blood; therefore, SF is a useful marker for diagnosing blood coagulation diseases such as disseminated intravascular coagulation (DIC). The antibody that specifically detects SF could be a useful tool for diagnosing thrombotic diseases. MATERIALS AND METHODS: By using an acid-solubilized desAA-FM (fibrin monomer) as an immunogen, we developed a monoclonal antibody, namely J2-23, which specifically reacts with SF and FM. We examined the specificity of J2-23 by ELISA and immunoblotting and confirmed the reactivity of J2-23 with SF and FM by gel filtration. RESULTS AND CONCLUSIONS: J2-23 specifically reacted with SF, but not with fibrinogen or plasmic fibrinogen-derived Fbg-X, Fbg-Y, Fbg-E, and D; thrombin-treated Fbn-X, Fbn-Y, and Fbn-E; and plasmic cross-linked fibrin (DD, XDP). The epitope recognized by J2-23 was located within the Aalpha 502-521 region on the C-terminal of the fibrinogen alpha-chain. The reactivity of J2-23 disappeared following the action of the fibrinolytic enzyme plasmin. Furthermore, J2-23 reacted not only with SF but also with FM in plasma from DIC patients. This indicated that J2-23 specifically detected coagulation without reflecting the plasmin action. We demonstrated the potential of J2-23 as a useful antibody for detecting SF for diagnosing blood coagulation.
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