Selection of Phages that Inhibit vWF Interaction with Collagen under both Static and Flow Conditions

H. Ulrichts; H. Depraetere; J. Harsfalvi; H. Deckmyn

doi:10.1055/s-0037-1616097

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2001; 86(02): 630-635
DOI: 10.1055/s-0037-1616097

Review Article

Schattauer GmbH

Selection of Phages that Inhibit vWF Interaction with Collagen under both Static and Flow Conditions

H. Ulrichts

¹Laboratory for Thrombosis Research, IRC, KU Leuven Campus Kortrijk, Belgium; Department of Clinical Chemistry, University of Debrecen Medical School, Debrecen, Hungary

,

H. Depraetere

¹Laboratory for Thrombosis Research, IRC, KU Leuven Campus Kortrijk, Belgium; Department of Clinical Chemistry, University of Debrecen Medical School, Debrecen, Hungary

,

J. Harsfalvi

¹Laboratory for Thrombosis Research, IRC, KU Leuven Campus Kortrijk, Belgium; Department of Clinical Chemistry, University of Debrecen Medical School, Debrecen, Hungary

,

H. Deckmyn

¹Laboratory for Thrombosis Research, IRC, KU Leuven Campus Kortrijk, Belgium; Department of Clinical Chemistry, University of Debrecen Medical School, Debrecen, Hungary

› Author Affiliations

Abstract

Summary

Phages from a pentadecamer phage display library were selected for binding to vWF by affinity panning. Bound phages were selectively eluted with human collagen type I. After the third round of panning 95% of individual phage clones bound to vWF. The B8-phage inhibited the binding of collagen to vWF with an IC₅₀ of 0.6 × 10¹⁰ phages/ml, and of vWF to collagen with an IC₅₀ of 1.0 × 10¹⁰ phages/ml at 0.5 μg/ml vWF. Under flow conditions, 1.5 × 10¹¹ B8-phage/ml nearly completely inhibited platelet deposition on a human collagen type I coated surface at a shear rate of 1200 s^-1, while phages without an insert had no effect. The peptide corresponding to the one displayed on the B8-phage competed with the phage for binding to vWF with an IC₅₀ of 30 μg/ml (16 μM). The peptide furthermore inhibited vWF-binding to collagen with a maximum of 40% at a concentration of 1.25 mg/ml (650 μM), higher concentrations of peptide could not improve this. We thus have selected phages that are potent vWF-binders and that can be used as tools to detect vWF, to inhibit vWF-collagen interaction and to further analyse the role of vWF-collagen binding.

Keywords

von Willebrand factor - phage display - platelet adhesion

Full Text

References

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