Adhesive properties of the carbohydrate-modified von Willebrand factor (CHO-vWF).

Abstract:

:In this cooperative study, we explored the role of the carbohydrate moiety (CHO) of von Willebrand factor (vWF) in supporting platelet adhesion. Because of previous discrepant results, all purification steps and CHO modifications by various enzymes were critically evaluated. Under our conditions, CHO-modified vWF preparations contained less than 5% of the initial sialic acid ([Neu]-ase-vWF) and less than 45% ([Neu-Gal]-ase-vWF) or 21% ([Neu-Gal-eF]-ase-vWF) of the D-galactose. These preparations usually showed increased electrophoretic mobility but no significant loss of high-mol-wt multimers when proteolysis had been prevented. Some degree of proteolysis was noted in some carbohydrate-modified vWFs, but the degree of degradation observed did not correlate with the removal of D-galactose. Platelet adhesion to various matrices increased after removal of the terminal sialic acid ([Neu]-ase-vWF) and approximately 45% of the D-galactose ([Neu-Gal]-ase-vWF), but returned to normal values when greater than 70% of the total carbohydrate had been removed by endoglycosidase F [Neu-Gal-ef]-ase-vWF). These changes in reactivity were also reflected in the spontaneous aggregation in normal platelet-rich plasma (PRP) after CHO removal.

journal_name

Blood

journal_title

Blood

authors

Federici AB,De Romeuf C,De Groot PG,Samor B,Lombardi R,D'Alessio P,Mazurier C,Mannucci PM,Sixma JJ

subject

Has Abstract

pub_date

1988-04-01 00:00:00

pages

947-52

issue

4

eissn

0006-4971

issn

1528-0020

journal_volume

71

pub_type

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