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Abstract
Fibrinogen and plasma fibronectin were shown to interact in the presence of factor
XIIIa. The reaction was enhanced by dithiothreitol and was accompanied by an increase
in the turbidity of the solution and the formation of particulate matter and gel structures.
At a constant concentration of fibrinogen the turbidity increase was dependent on
the fibronectin concentration and at a constant concentration of fibronectin, on the
fibrinogen concentration. Kinetic experiments showed that an initial step in the reaction
between fibrinogen and fibronectin was the formation of a transient intermediate containing
1 mole of fibrinogen and 1 mole of fibronectin. Transient intermediates of larger
molecular weight and containing both fibrinogen and fibronectin were also formed.
These heterooligomers eventually reached huge molecular sizes and at early times formed
particulate matter that sedimented on centrifugation. The predominant molecular species
formed in an equimolar mixture of fibrinogen and fibronectin were heteropolymers.
Small amounts of homopolymers composed of fibrinogen and possibly also homopolymers
of fibronectin were detected. The results are discussed in terms of reaction mechanism
and potential importance of this novel oligomerization pathway in haemostasis, thrombosis
and tissue repair.
Keywords
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Article info
Publication history
Accepted:
September 2,
1985
Received:
July 15,
1985
Identification
Copyright
© 1985 Published by Elsevier Inc.