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Abstract
To evaluate the role of fibronectin (Fn) in factor VIII (FVIII) and von Willebrand
factor (vWf) cryoprecipitation, factor VIII procoagulant activity, factor VIII coagulant
antigen, factor VIII-related antigen and von Willebrand ristocetin cofactor activity
were measured in cryoprecipitate and cryosupernatant from normal and Fn-depleted plasmas.
Following cryoprecipitation of normal plasmas, most of the FVIII and almost all the
FvWf recovered were found with a part of Fn and of fibrinogen in cryoprecipitate.
Fn-depleted plasmas prepared either by affinity chromatography on gelatin or by immunoadsorption
on monoclonal anti-Fn antibodies behaved differently : although their cryoprecipitate
contained normal fibrinogen levels, neither FVIII nor FvWf was precipitated. Experiments
performed with Fn-depleted plasma to which purified fibronectin had been added, and
samples of plasma with decreased Fn levels (0.01 to 0.2 g/l) suggest that there is
a relation between initial Fn level and the extent of FVIII/vWf cryoprecipitation.
We conclude that Fn, like fibrinogen, is necessary to induce cryoprecipitation of
FVIII/vWf and that an initial plasma level of 0.2 g/l is sufficient to obtain good
recovery of FVIII/vWf in cryoprecipitate.
Keywords
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Article info
Publication history
Accepted:
December 20,
1984
Received:
July 27,
1984
Identification
Copyright
© 1985 Published by Elsevier Inc.