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DOI: 10.1055/s-0038-1660078
Antithrombin III Antigen in Human Platelets
Publikationsverlauf
Received 22. April 1985
Accepted after resubmission 14. Juni 1985
Publikationsdatum:
19. Juli 2018 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/198503/lookinside/thumbnails/10-1055-s-0038-1660078-1.jpg)
Summary
Immunoreactive AT III was found in human platelets. AT III antigen was quantified in platelets taken from each of 17 healthy donors by a specific competitive enzyme immunoassay using purified AT III and AT III antibodies. AT III antigen levels in extracts of washed platelets disrupted by freezing and thawing ranged from 32 to 140 ng per 109 platelets with a mean value of 70.3 ± 27.3. When stimulated by arachidonic acid, the platelets released AT III antigen together with immunoreactive fibrinogen. These results show that AT III is present in platelets at a level corresponding to approximately 0.01% of total antithrombin in normal blood, and suggest that platelet AT III, like fibrinogen, is contained in the storage granules.
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