Thromb Haemost 1992; 68(05): 486-494
DOI: 10.1055/s-0038-1646305
Original Article
Schattauer GmbH Stuttgart

A Specific Immunologic Assay for Functional Plasminogen Activator Inhibitor 1 in Plasma – Standardized Measurements of the Inhibitor and Related Parameters in Patients with Venous Thromboembolic Disease

Malou Philips
1   The Department of Clinical Chemistry, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark
2   The Coagulation Section, Department of Clinical Chemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
,
Anne-Grethe Juul
3   The Novo Nordisk Research Institute, Bagsværd, Denmark
,
Johan Selmer
3   The Novo Nordisk Research Institute, Bagsværd, Denmark
,
Bent Lind
2   The Coagulation Section, Department of Clinical Chemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
,
Sixtus Thorsen
2   The Coagulation Section, Department of Clinical Chemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
› Author Affiliations
Further Information

Publication History

Received 05 February 1992

Accepted after revision 09 June 1992

Publication Date:
04 July 2018 (online)

Summary

A new assay for functional plasminogen activator inhibitor 1 (PAI-1) in plasma was developed. The assay is based on the quantitative conversion of PAI-1 to urokinase-type plasminogen activator (u-PA)-PAI-l complex the concentration of which is then determined by an ELISA employing monoclonal anti-PAI-1 as catching antibody and monoclonal anti-u-PA as detecting antibody. The assay exhibits high sensitivity, specificity, accuracy, and precision. The level of functional PAI-1, tissue-type plasminogen activator (t-PA) activity and t-PA-PAI-1 complex was measured in normal subjects and in patients with venous thromboembolism in a silent phase. Blood collection procedures and calibration of the respective assays were rigorously standardized. It was found that the patients had a decreased fibrinolytic capacity. This could be ascribed to high plasma levels of PAI-1. The release of t-PA during venous occlusion of an arm for 10 min expressed as the increase in t-PA + t-PA-PAI-1 complex exhibited great variation and no significant difference could be demonstrated between the patients with a thrombotic tendency and the normal subjects.

 
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