Abstract:
:This study demonstrates that when platelets are stimulated by thrombin in the presence of low concentrations of purified human fibrinogen (10 to 20 micrograms/mL, final concentration) binding of released platelet von Willebrand factor (plt-vWF) to the platelet membrane is enhanced. This effect appears to be mediated by fibrin monomer produced by the action of thrombin on the fibrinogen in the incubation suspension. When fibrin polymerization is inhibited, the binding of released plt-vWF to the platelets is markedly increased. This enhanced binding is dependent on platelet glycoprotein Ib (GPIb) as shown by a decreased response with Bernard-Soulier platelets and inhibition by both monoclonal and polyclonal antibodies against glycocalicin. The binding of fibrin to thrombin-activated platelets preincubated with monoclonal antibody against GPIIb/IIIa is increased when the predominant form of fibrin is fibrin monomer. The fibrin binding is also decreased in the presence of antibody against glycocalicin. Our data demonstrate that fibrin monomer facilitates plt-vWF binding to the glycocalicin portion of platelet GPIb on thrombin-stimulated platelets and that binding of fibrin monomer to glycocalicin is necessary for this response to occur.
journal_name
Bloodjournal_title
Bloodauthors
Parker RI,Gralnick HRsubject
Has Abstractpub_date
1987-11-01 00:00:00pages
1589-94issue
5eissn
0006-4971issn
1528-0020journal_volume
70pub_type
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