Title: Identification of a VWF peptide antagonist that blocks platelet adhesion under high shear conditions by selectively inhibiting the VWF-collagen interaction
Authors: Szanto, T *
Vanhoorelbeke, Karen *
Toth, G
Vandenbulcke, A
Toth, J
Noppe, W
Deckmyn, Hans
Harsfalvi, J # ×
Issue Date: Oct-2009
Series Title: Journal of Thrombosis and Haemostasis vol:7 issue:10 pages:1680-1687
Abstract: Summary Background: Since the collagen-VWF-GPIb/IX/V axis plays an important role in thrombus formation, it represents a promising target for development of new antithrombotic agents. Objectives: We used phage display to identify potential small peptides that interfere with the VWF-collagen binding and might serve as lead products for the development of possible oral antithrombotic compounds. Methods: A random linear heptamer peptide library was used to select VWF-binding peptides. Results: We identified a phage clone, displaying the YDPWTPS sequence, further referred to as L7-phage, that bound to VWF in a specific and a dose-dependent manner. This L7-phage specifically inhibited the VWF-collagen interaction under both static and flow conditions. Epitope mapping using deletion mutants of VWF revealed that the L7-phage does not bind to the known collagen-binding A3-domain within VWF, but to the more carboxyterminal situated C-domain. This inhibition was not due to steric hindrance of the A3 domain-collagen interaction by the L7-phage. Indeed, a tetrabranched multi-antigen peptide (MAP) presenting four copies of the peptide, but not the scrambled MAP, also inhibited VWF-collagen interaction under conditions of high shear stress at a concentration of 148 nM. Conclusions: Based on these results, we conclude that we have identified the first peptide antagonist that binds to the VWF C-domain and by this specifically inhibits the VWF binding to collagen suppressing platelet adhesion and aggregation under high shear conditions. As a consequence, this peptide and its future derivates are potentially interesting antithrombotic agents.
ISSN: 1538-7933
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Interdisciplinary Research Facility Life Sciences, Campus Kulak Kortrijk
Chemistry, Campus Kulak Kortrijk
* (joint) first author
× corresponding author
# (joint) last author

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