Thromb Haemost 2000; 84(01): 83-87
DOI: 10.1055/s-0037-1613972
Commentary
Schattauer GmbH

Fibrinogen, Fibrin and Crosslinking in Aging Arterial Thrombi

Robert D. McBane II
1   From the Department of Medicine, Division of Cardiovascular Diseases, Rochester, MN, USA
2   Department of Medicine, Section of Hematology Research, Rochester, MN, USA
,
Monique A. P. Ford*
2   Department of Medicine, Section of Hematology Research, Rochester, MN, USA
3   Department of Biochemistry and Molecular Biology, Mayo Clinic and Foundation for Education and Research, Rochester, MN, USA
,
Krzysztof Karnicki
2   Department of Medicine, Section of Hematology Research, Rochester, MN, USA
,
MaryLou Stewart
2   Department of Medicine, Section of Hematology Research, Rochester, MN, USA
,
Whyte G. Owen
2   Department of Medicine, Section of Hematology Research, Rochester, MN, USA
3   Department of Biochemistry and Molecular Biology, Mayo Clinic and Foundation for Education and Research, Rochester, MN, USA
› Institutsangaben
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Publikationsverlauf

Received 27. Juli 1999

Accepted after resubmission 21. Februar 2000

Publikationsdatum:
10. Dezember 2017 (online)

Summary

The assumption that fibrin and crosslinked fibrin impart irreversibility to arterial thrombi is explored with procedure developed for measuring changes in platelet function, morphology and fibrinogen metabolism in aging occlusive thrombi, in which the condition of stasis is imposed uniformly. Arterial thrombi containing autologous 111In labeled platelets were generated in vivo by bilateral mechanical injury of porcine carotid arteries. Vessels containing the platelet-rich thrombi were harvested and incubated intact (37° C) for intervals ranging from 30 min to 12 h. The isolated vessels were then bisected and agitated in culture medium containing tick anticoagulant and hirudin for 60 min. Disaggregated platelets were evaluated for yield (from 111In radioactivity) viability (dense body ATP secretion) and morphology (electron microscopy). Western analysis of fibrin(ogen) in thrombus extracts was performed using anti-fibrinogen Bβ- and γ-chain monoclonal antibodies for thrombi at each time point. A stable recovery of nearly 50% of platelets was observed during 12 h of thrombus aging. As thrombi aged, viability of disaggregated platelets gradually decreased with platelet necrosis the predominant feature beyond 6 h. By western analysis of thrombus extracts, nearly 50% of fibrinogen was cleaved to fibrin and extensively crosslinked within 30 min of injury with no evidence of fibrinolysis. With the exception of a declining proportion of γ-monomer, these features remain relatively constant during 12 h of thrombus maturation. It is concluded that neither fibrin nor crosslinked fibrin are dominant factors imparting cohesion within platelet thrombi. Furthermore, under conditions of complete arterial occlusion imposed by this experimental design, there is no evidence of endogenous fibrinolysis.

* Current address: University of The West Indies, Mona, Kingston, Jamaica


 
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