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Antibodies to serine proteases in the antiphospholipid syndrome Chen PP; Giles ICurr Rheumatol Rep 2010[Feb]; 12 (1): 45-52It is generally accepted that the major autoantigen for antiphospholipid antibodies (aPL) in the antiphospholipid syndrome (APS) is beta(2)-glycoprotein I (beta(2)GPI). However, a recent study has revealed that some aPL bind to certain conformational epitope(s) on beta(2)GPI shared by the homologous enzymatic domains of several serine proteases involved in hemostasis and fibrinolysis. Importantly, some serine protease-reactive aPL correspondingly hinder anticoagulant regulation and resolution of clots. These results extend several early findings of aPL binding to other coagulation factors and provide a new perspective about some aPL in terms of binding specificities and related functional properties in promoting thrombosis. Moreover, a recent immunological and pathological study of a panel of human IgG monoclonal aPL showed that aPL with strong binding to thrombin promote in vivo venous thrombosis and leukocyte adherence, suggesting that aPL reactivity with thrombin may be a good predictor for pathogenic potentials of aPL.|Antibodies, Antiphospholipid/*immunology[MESH]|Antiphospholipid Syndrome/*immunology[MESH]|Antithrombins/physiology[MESH]|Epitopes/immunology[MESH]|Fibrinolysis/physiology[MESH]|Humans[MESH]|Immunoglobulin G/immunology[MESH]|Serine Proteases/*immunology[MESH]|Thrombin/immunology[MESH]|Thrombosis/immunology[MESH] |
