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Thromb Haemost 2002; 88(01): 137-143
DOI: 10.1055/s-0037-1613166
Review Article
Schattauer GmbH

Characterization and Comparative Evaluation of a Novel PAI-1 Inhibitor

Ann Gils
1   Laboratory for Pharmaceutical Biology and Phytopharmacology, Faculty of Pharmaceutical Sciences, Katholieke Universiteit Leuven, Belgium
,
Jean-Marie Stassen
2   Boehringer Ingelheim Pharma KG, Biberach, Germany
,
Herbert Nar
2   Boehringer Ingelheim Pharma KG, Biberach, Germany
,
Joerg T. Kley
2   Boehringer Ingelheim Pharma KG, Biberach, Germany
,
Wolfgang Wienen
2   Boehringer Ingelheim Pharma KG, Biberach, Germany
,
Uwe J. Ries
2   Boehringer Ingelheim Pharma KG, Biberach, Germany
,
Paul J. Declerck
1   Laboratory for Pharmaceutical Biology and Phytopharmacology, Faculty of Pharmaceutical Sciences, Katholieke Universiteit Leuven, Belgium
› Author Affiliations
Further Information

Publication History

Received 28 January 2002

Accepted after resubmission 08 April 2002

Publication Date:
09 December 2017 (online)

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Summary

Plasminogen activator inhibitor-1 (PAI-1), the primary physiological inhibitor of both tissue-type plasminogen activator and urokinasetype plasminogen activator in plasma, is a well established risk factor in thrombotic diseases. Reduction of active PAI-1 levels may lead to a decreased tendency of thrombosis. Compounds that can suppress pharmacologically active PAI-1 levels are therefore considered as putative drugs.

In the present study, we describe the PAI-1 neutralizing properties and mechanism of a newly selected compound (i. e. fendosal, HP129) in comparison to four previously reported compounds (i. e. AR-H029953XX, XR1853, XR5118 and the peptide TVASS) using different assays. The inhibitory effect of these compounds on active PAI-1 was analyzed by a plasmin-coupled chromogenic assay (Coaset® t-PA), direct chromogenic assays (t-PA, u-PA) and quantification of complex formation by ELISA, SDS-PAGE and surface plasmon resonance. Comparative evaluation of the obtained IC50 values reveals large differences [i. e. IC50 of 15 µM (HP129) vs. >1000 µM (XR5118) determined at 37° C using SDS-PAGE] between the compounds studied.

Importantly, the relative potency of the various compounds is also dependent on the method used (10 to 170-fold differences in IC50 values). Characterization of the PAI-1 forms (i. e. active, non-reactive and substrate) generated upon inactivation reveals that the newly described compound HP129 induces a unique pathway (i. e. active to non-reactive conversion via a substrate-behaving intermediate) of inactivation compared to the other compounds.

Taken together, these data strongly suggest that the various compounds act through different mechanisms. In addition, the results stress the necessity for a careful selection of the method used for the evaluation of PAI-1 inhibitors, preferably requiring a panel of screening methods.

Keywords

PAI-1 - PAI-1 inhibitor - serpin - thrombosis
 

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