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Thromb Haemost 2014; 111(04): 598-609
DOI: 10.1160/TH13-09-0800
Theme Issue Article
Schattauer GmbH

The various states of von Willebrand factor and their function in physiology and pathophysiology

Volker Huck
1   Heidelberg University, Medical Faculty Mannheim, Department of Dermatology, Experimental Dermatology, Mannheim, Germany
,
Matthias F. Schneider
2   Boston University, Department of Mechanical Engineering, Boston, Massachusetts, USA
,
Christian Gorzelanny
1   Heidelberg University, Medical Faculty Mannheim, Department of Dermatology, Experimental Dermatology, Mannheim, Germany
,
Stefan W. Schneider
1   Heidelberg University, Medical Faculty Mannheim, Department of Dermatology, Experimental Dermatology, Mannheim, Germany
› Author Affiliations
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Publication History

Received: 27 September 2013

Accepted after major revision: 08 February 2014

Publication Date:
29 November 2017 (online)

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Summary

The specific interactions of von Willebrand factor (VWF) with the vessel wall, platelets or other interfaces strongly depend on (a shearinduced) VWF activation. Shear flow has been shown to induce a conformational transition of VWF, but is modulated by its thermodynamic state (state-function relationship). The state in turn is determined by physical (e.g. vessel geometry), physico-chemical (e.g. pH) and molecular-biological (e.g. mutants, binding) factors. Combining established results with recent insights, we reconstruct VWF biology and its statefunction relationship from endothelial cell release to final degradation in the human vasculature. After VWF secretion, endothelial-anchored and shear activated VWF multimers can rapidly interact with surrounding colloids, typically with platelets. Simultaneously, this VWF activation enables ADAMTS13 to cleave VWF multimers thereby limiting VWF binding capacity. The subsequent cell-surface dissociation leads to a VWF recoiling to a globular conformation, shielding from further degradation by ADAMTS13. High local concentrations of these soluble VWF multimers, transported to the downstream vasculature, are capable for an immediate reactivation and re-polymerisation initiating colloid-binding or VWF-colloid aggregation at the site of inflamed endothelium, vessel injuries or pathological high-shear areas. Focusing on these functional steps in the lifecycle of VWF, its qualitative and quantitative deficiencies in the different VWD types will facilitate more precise diagnostics and reliable risk stratification for prophylactic therapies. The underlying biophysical principles are of general character, which broadens prospective studies on the physiological and pathophysiological impact of VWF and VWF-associated diseases and beares hope for a more universal understanding of an entire class of phenomena.

Keywords

VWF - shear stress - ADAMTS13 - TTP - VWD

 

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