Antithrombin III, the Major Modulator of Intravascular Coagulation, Is Synthesized by Human Endothelial Cells

Author:

Chan T K1,Chan Vivian1

Affiliation:

1. The Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong

Abstract

SummaryHuman endothelial cells in culture is shown to synthesize antithrombin III (At-III). The endothelial cell At-III(EC-At-III) consists of a small fraction similar to plasma At-III and a larger fraction with decreased heparin-binding as tested by crossed immunoelectrophoresis. However, both the anti-Xa and thrombin-neutralizing activities of the EC-At-III were rapid and active even in the absence of added heparin. It is concluded that the major portion was probably bound to endogenous heparin-like substance, thus accounting for its decreased exogenous heparin binding. The presence of At-III and other antithrombotic factors in the vascular endothelium offer protection against thrombosis and possibly atherosclerosis.

Publisher

Georg Thieme Verlag KG

Subject

Hematology

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