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Abstract
The present study probes for the segment of the fibrinogen molecule which interacts
with the platelet surface upon induction of release-related aggregation. The capability
of platelets affixed with fibrinogen fragment D or fibrinogen fragment E to enhance
aggregation of gel-filtered platelets (GFP) was compared with that of platelets affixed
with fibrinogen. It is shown that release-related aggregation induced by either A23187,
10 μM ADP or thrombin is enhanced by the addition of fixed platelets bearing covalently
bound fragment D by as much as 60–70% of the augmentation obtained by platelets bearing
fibrinogen. On the other hand, fixed platelets bearing covalently-bound fragment E
have no effect on the aggregation of GFP. It is concluded that fragment D bears the
site for the interaction of fibrinogen with activated platelets, apparently, with
surface-bound thrombospondin.
Keywords
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Article info
Publication history
Accepted:
December 13,
1984
Received:
August 15,
1984
Identification
Copyright
© 1985 Published by Elsevier Inc.