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von Willebrand factor variant D1472H has no effect in mice with humanized VWF-platelet interactions. Blood Adv 2020 09 08;4(17):4065-4068

Date

09/02/2020

Pubmed ID

32870970

Pubmed Central ID

PMC7479953

DOI

10.1182/bloodadvances.2020002629

Scopus ID

2-s2.0-85100184214   1 Citation

Abstract

The von Willebrand factor ristocetin cofactor activity assay (VWF:RCo) is used for diagnosis of von Willebrand disease (VWD) because of its ability to evaluate VWF binding to platelets. VWF sequence variant p.D1472H is associated with lower VWF:RCo levels in the absence of associated bleeding symptoms, indicating the VWF:RCo may not be accurate for characterizing VWF function in individuals with this variant. Thus, this study aimed to determine the implications of the variant on VWF functioning in vivo. Mice were engineered with humanized wild-type (WT*) VWF A1/A2 and VWF with the p.D1472H (1472H) variant along with humanized platelet GPIbα and bred to homozygosity. VWF antigen and VWF binding to GPIbα were measured using enzyme-linked immunosorbent assay. Gel electrophoresis was used for VWF multimer analysis. Tail bleeding assays were performed at a 3-mm defined length. Normal VWF multimers were preserved in both WT* and 1472H mice. VWF expression was normal in the WT* and 1472H mice, and VWF binding to GPIbα did not statistically differ between the groups. Additionally, tail bleeding times were similar for WT* and 1472H mice. These results show the p.D1472H variant does not impair hemostasis in mice, and support the conclusion that p.D1472H is a normal variant in humans.

Author List

Lohmeier HK, Slobodianuk TL, Kanaji S, Haberichter SL, Montgomery RR, Flood VH

Authors

Veronica H. Flood MD Professor in the Pediatrics department at Medical College of Wisconsin
Robert R. Montgomery MD Adjunct Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Bleeding Time
Blood Platelets
Hemorrhage
Mice
von Willebrand Diseases
von Willebrand Factor