Functionally active thrombomodulin is present in human platelets.

Abstract:

:We found functionally active thrombomodulin in human platelets (60 +/- 18 molecules per platelet). Protein C appeared not to be activated by thrombin with gel-filtered platelets. However, the activation of protein C by thrombin was accelerated by thrombin-stimulated and washed platelets. This cofactor activity of the platelets was neutralized by the anti-lung thrombomodulin-F(ab')2. From the Triton X-extract of platelets, thrombomodulin was partially purified by diisopropylphosphoryl-thrombin-agarose affinity chromatography. The Mr of the predominant platelet thrombomodulin was 78,000 before and 109,000 after reduction on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, values identical to those of placental thrombomodulin. The specific activity of the cofactor activity, apparent Kd (0.4 nM) for thrombin and Km (0.67 microM) for protein C of platelet thrombomodulin were also identical to those of placenta thrombomodulin. Thrombomodulin may play a role in activation of protein C on the surface of platelets.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Suzuki K,Nishioka J,Hayashi T,Kosaka Y

doi

10.1093/oxfordjournals.jbchem.a122523

subject

Has Abstract

pub_date

1988-10-01 00:00:00

pages

628-32

issue

4

eissn

0021-924X

issn

1756-2651

journal_volume

104

pub_type

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