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Research Article Free access | 10.1172/JCI109113

The activation of plasminogen by Hageman factor (Factor XII) and Hageman factor fragments.

G H Goldsmith Jr, H Saito, and O S Ratnoff

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Published July 1, 1978 - More info

Published in Volume 62, Issue 1 on July 1, 1978
J Clin Invest. 1978;62(1):54–60. https://doi.org/10.1172/JCI109113.
© 1978 The American Society for Clinical Investigation
Published July 1, 1978 - Version history
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Abstract

Activation of plasminogen through surface-mediated reactions is well recognized. In the presence of kaolin, purified Hageman factor (Factor XII) changed plasminogen to plasmin, as assayed upon a synthetic amide substrate and by fibrinolysis. Kinetic studies suggested an enzymatic action of Hageman factor upon its substrate, plasminogen. Hageman factor fragments, at a protein concentration equivalent to whole Hageman factor, activated plasminogen to a lesser extent. These protein preparations were not contaminated with other agents implicated in surface-mediated fibrinolysis. Diisopropyl fluorophosphate treatment of plasminogen did not inhibit its activation by Hageman factor. These studies indicate that Hageman factor has a hitherto unsuspected function, the direct activation of plasminogen.

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