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Blood, 1 January 2005, Vol. 105, No. 1, pp. 145-152.
Prepublished online as a Blood First Edition Paper on August 26, 2004; DOI 10.1182/blood-2004-02-0464.
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Submitted February 5, 2004
Accepted August 12, 2004
Re-establishment of VWF-dependent Weibel-Palade bodies in VWD endothelial cells
Sandra L Haberichter*, Elizabeth P Merricks, Scot A Fahs, Pamela A Christopherson, Timothy C Nichols, and Robert R Montgomery
Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA; Children's Research Institute, Children's Hospital of Wisconsin, Milwaukee, WI, USA
Department of Pathology and Laboratory Medicine, University of North Carolina School of Medicine, Chapel Hill, NC, USA
Blood Research Institute, Blood Center of Southeastern Wisconsin, Milwaukee, WI, USA
Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA; Blood Research Institute, Blood Center of Southeastern Wisconsin, Milwaukee, WI, USA; Children's Research Institute, Children's Hospital of Wisconsin, Milwaukee, WI, USA
* Corresponding author; email: shaberic{at}mcw.edu.
Type 3 von Willebrand disease (VWD) is a severe hemorrhagic defect in humans. We now identify the homozygous mutation in the Chapel Hill strain of canine type 3 VWD that results in premature termination of von Willebrand factor (VWF) protein synthesis. We cultured endothelium from VWD and normal dogs to study intracellular VWF trafficking and Weibel-Palade body formation. Weibel-Palade bodies could not be identified in the canine VWD aortic endothelial cells (VWD-AEC) by P-selectin, VWFpp, or VWF immunostaining and confocal microscopy. We demonstrate the re-establishment of Weibel-Palade bodies that recruit endogenous P-selectin by expressing wild-type VWF in VWD-AEC. Expression of mutant VWF proteins confirmed that VWF multimerization is not necessary for Weibel-Palade body creation. Although the VWF propeptide is required for the formation of Weibel-Palade bodies, it cannot independently induce the formation of the granule. These VWF-null endothelial cells provide a unique opportunity to examine the biogenesis of Weibel-Palade bodies in endothelium from a canine model of type 3 VWD.

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