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Thromb Haemost 2002; 88(02): 288-293
DOI: 10.1055/s-0037-1613200
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Importance of N-Terminal Residues in Plasminogen Activator Inhibitor 1 on its Antibody Induced Latency Transition

Thu-Hoa Ngo
1   Laboratory for Pharmaceutical Biology and Phytopharmacology, Faculty of Pharmaceutical Sciences, Katholieke Universiteit Leuven, Belgium
,
Yan Zhou
1   Laboratory for Pharmaceutical Biology and Phytopharmacology, Faculty of Pharmaceutical Sciences, Katholieke Universiteit Leuven, Belgium
,
Jean-Marie Stassen
2   Cardiovascular Pharmacology, Boehringer Ingelheim Pharma KG, Biberach a/d Riss, 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 30 January 2002

Accepted after revision 22 April 2002

Publication Date:
07 December 2017 (online)

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Summary

The serpin plasminogen activator inhibitor-1 (PAI-1) is a wellknown risk factor for thromboembolic and cardiovascular diseases. Many efforts have been made to reveal structure-function relationship in PAI-1, including the understanding of its unique latency transition. In this study, we describe the molecular characterization of PAI-1 neutralization by MA-159M12, a monoclonal antibody against rat PAI-1.

Time-dependent inactivation of PAI-1, exposure of a trypsin cleavage site typically for the latent conformation and disappearance of elastase susceptibility revealed that MA-159M12 accelerated the active to latent, conformational transition (t1/2 120 ± 12 min and 18 ± 3.6 min in the absence and presence of MA-159M12, p <0.0001).

Cross-reactivity analysis of the antibody with various rat/human PAI-1 chimeras revealed that the epitope resides in αhA of rat PAI-1. Subsequent alanine-scanning mutagenesis and binding studies demonstrated that Pro2- Leu3- Pro4-Glu5 constitute the major residues of the epitope for MA-159M12. In conclusion, these findings demonstrate that, even though unexpected based on current knowledge on PAI-1 stability and function, interference with αhA results in a destabilisation of its active, inhibitory conformation. Therefore, αhA forms a putative target for the rational development of PAI-1 neutralizing components.

Keywords

PAI-1 - monoclonal antibody - serpin - thrombosis
 

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