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Thromb Haemost 1988; 60(03): 498-505
DOI: 10.1055/s-0038-1646999
Original Article
Schattauer GmbH Stuttgart

Abnormality of the N-Terminal Portion of von Willebrand Factor in Type IIA and IIC von Willebrand Disease

Y Takahashi
INSERM U. 143, Hôpital de Bicêtre, Paris, France
,
M Kalafatis
INSERM U. 143, Hôpital de Bicêtre, Paris, France
,
J P Girma
INSERM U. 143, Hôpital de Bicêtre, Paris, France
,
D Meyer
INSERM U. 143, Hôpital de Bicêtre, Paris, France
› Author Affiliations
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Publication History

Received 13 June 1988

Accepted after revision 15 August 1988

Publication Date:
30 June 2018 (online)

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Summary

We have established a new analytical method which allows the characterization of von Willebrand factor (vWF) degradation fragments in minute amounts (10 μ1) of plasma, without the need for immunopurification of vWF. Plasma vWF was hydrolysed by S aureus V-8 protease (V-8 protease) and the cleaved fragments separated by SDS-agarose gel electrophoresis followed by staining with 125I-labeled polyclonal or monoclonal antibodies against vWF and autoradiography. Quantification of the amount of each product was estimated by counting the incorporated radioactivity following excision. V-8 protease limitedly hydrolysed vWF in normal as well as type I von Willebrand disease (vWD) plasma and produced two distinct fragments with identical electrophoretic and antigenic characteristics to those produced from purified vWF, i.e. a C-terminal SpII and a series of N-terminal Spill fragments (SpIIIa, b and c). The method was applied to further characterize the molecular abnormalities of vWF in eighteen patients with type II vWD. In seven individuals with type IIA and five patients with type IIC, Spill appeared significantly modified as compared to normal. In type IIA, there was a marked decrease or absence of SpIIIa and an increase of SpIIIb and c. In type IIC, SpIIIb was lacking. In three patients with type IIB and in three patients with type IID, there was no significant modification of Spill. In all cases, SpII was apparently not modified. In conclusion, the molecular abnormality of vWF in type IIA and IIC vWD appears to reside in Spill, the N-terminal portion of the vWF-subunit (residues 1 to 1,365).

Keywords

von Willebrand factor (vWF) - von Willebrand disease (vWD) - S aureus V8 protease (V8-protease)
 

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