Abstract
ABO (H) blood group antigens are covalently linked to the oligosaccharide side-chains of yon Willebrand factor (VWF). In this study, we investigated the role of the A and B antigens in the expression of VWF adhesive activity. VWF of type A, B or O was purified from fresh frozen plasma. Presence of A or B antigen on the VWF was confirmed by enzyme-linked immunosorbent assay (ELISA) and by immunoblotting with monoclonal anti-A or anti-B. The A or B antigen was also detected in the 48/52-kDa fragment of the respective VWF after trypsin digestion. Removal of A antigen with α-N-acetylgalactosminidase or B antigen with α- galactosidase did not affect its multimer size or antigenic level, but decreased the ristocetin cofactor (RCoF) activity of the respective VWF by 33-39% (P < 0·01-0·002). Removal of A or B antigen from VWF did not affect the binding of the VWF to immobilized type III collagen. A and B antigens were not detected in platelet VWE. These results indicate that AB structures play a role in platelet aggregating activity of VWF.
Original language | English (US) |
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Pages (from-to) | 857-864 |
Number of pages | 8 |
Journal | British Journal of Haematology |
Volume | 109 |
Issue number | 4 |
DOIs | |
State | Published - 2000 |
Keywords
- ABO blood group
- Bleeding disorder
- Platelet
- Ristocetin cofactor activity
- Thrombosis
- Von Willebrand factor
ASJC Scopus subject areas
- Hematology