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Thromb Haemost 1985; 54(02): 510-524
DOI: 10.1055/s-0038-1657885
Original Article
Schattauer GmbH Stuttgart

Enhancement of Factor VIII-von Willebrand Factor Ristocetin Cofactor Activity by Monoclonal Antibodies

V Hornsey
The Edinburgh and South-East Scotland Blood Transfusion Service, Royal Infirmary, Edinburgh, UK
,
L R Micklem
*   The Department of Surgery, Edinburgh University, Edinburgh, UK
,
M C McCann
*   The Department of Surgery, Edinburgh University, Edinburgh, UK
,
K James
*   The Department of Surgery, Edinburgh University, Edinburgh, UK
,
J Dawes
**   The MRC/SNBTS Blood Components Assay Group, Edinburgh, UK
,
D B L McClelland
The Edinburgh and South-East Scotland Blood Transfusion Service, Royal Infirmary, Edinburgh, UK
,
C V Prowse
The Edinburgh and South-East Scotland Blood Transfusion Service, Royal Infirmary, Edinburgh, UK
› Author Affiliations
Further Information

Publication History

Received 23 November 1984

Accepted 31 May 1985

Publication Date:
18 July 2018 (online)

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Summary

Five monoclonal antibodies to human von Willebrand factor were selected for characterization from 18 produced in murine hybridomas. All showed a high and specific affinity for human von Willebrand factor (vWf) but exhibited little if any crossreaction with sera from other species. The antibodies defined four epitopes on vWf, none of which were involved in platelet binding. Binding of two distinct antibodies at one of these epitopes was associated with enhancement of the rate of vWf-dependent platelet agglutination in the presence of ristocetin. This effect was more noticeable when cryosupernatant plasma was used in place of normal plasma as the source of vWf, and was not explicable simply in terms of antibody-induced cross-linking of vWf.

Keywords

Factor VIII - von Willebrand factor - Ristocetin cofactor - Monoclonal antibody
 

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