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Inhibition of factor Xa-mediated procoagulant activity of human lung fibroblasts and pleural mesothelial cells

A Kumar, KB Koenig, AR Johnson, DS Fair, S Idell
European Respiratory Journal 1995 8: 2038-2045; DOI:
A Kumar
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KB Koenig
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AR Johnson
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DS Fair
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S Idell
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Abstract

Extravascular fibrin deposition characterizes diverse forms of lung and pleural injury. Fibrin formation in these compartments is locally potentiated by the assembly and expression of the prothrombinase procoagulant complex (factors Xa, Va and II) at the surface of human lung fibroblasts and pleural mesothelial cells. We sought to identify structural domains on factor Xa that mediate expression of prothrombinase activity by these cells. In order to accomplish this objective, we used panels of monoclonal antibodies (MoAbs) to factor X to block prothrombinase assembly and function on the surface of cultured human lung fibroblasts and pleural mesothelial cells. Of 30 factor X MoAbs that recognized native factors X and Xa, 10 completely inhibited factor Xa function (prothrombin activation), and five others neutralized Xa function without affecting cell-binding, presumably by blocking the prothrombin binding site. Western blots showed that these inhibitory MoAbs reacted with the Xa heavy-chain. One MoAb that recognized the factor Xa light-chain blocked prothrombin activation at the factor Va binding site. Our results indicate that prothrombinase activity at the surface of lung parachymal or pleural cells can be blocked by MoAbs that interact with either the heavy- or light-chain of factors X. Antibodies that neutralize cell surface-expressed prothrombin activation offer a potential means to arrest pericellular fibrin formation in the lung and pleural space.

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Inhibition of factor Xa-mediated procoagulant activity of human lung fibroblasts and pleural mesothelial cells
A Kumar, KB Koenig, AR Johnson, DS Fair, S Idell
European Respiratory Journal Dec 1995, 8 (12) 2038-2045;

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Inhibition of factor Xa-mediated procoagulant activity of human lung fibroblasts and pleural mesothelial cells
A Kumar, KB Koenig, AR Johnson, DS Fair, S Idell
European Respiratory Journal Dec 1995, 8 (12) 2038-2045;
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