Thromb Haemost 1969; 21(02): 173-180
DOI: 10.1055/s-0038-1653526
Originalarbeiten - Original Articles - Travaux Originaux
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Inhibition of the Thrombin-Fibrinogen Reaction by α2-Macroglobulin, Studied by N-Terminal Analysis

U Abildgaard
1  Haematological Research Laboratory, Dept. IX, Ullevål Hospital, University Clinic, Oslo, Norway
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Publication Date:
10 June 2018 (online)


The influence of α2-macroglobulin on the thrombin-fibrinogen reaction was studied with purified human reagents. The N-terminal changes reflecting fibrinopeptide release was measured.

α2-macroglobulin inhibited progressively the release of fibrinopeptides A and B. Fibrin polymerization was not influenced. The amount of fibrin formed depended on thrombin and α2-macroglobulin concentrations. When initial thrombin concentration was below 0.2 NIH units/ml, physiological α2-macroglobulin concentrations reduced fibrin formation. The contribution of α2-macroglobulin to the inhibition of the thrombin-fibrinogen reaction in plasma was evaluated.