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Fibrin-mediated plasminogen activation.

W Nieuwenhuizen1

  • 1Gaubius Laboratory, TNO Prevention and Health, P.O. Box 2215, 2301 CE Leiden, The Netherlands. w.nieuwenhuizen@pg.tno.nl

Annals of the New York Academy of Sciences
|July 20, 2001
PubMed
Summary

Fibrin, not fibrinogen, significantly accelerates plasminogen activation by tissue-type plasminogen activator (t-PA). This enhancement is due to specific exposed sites on fibrin, crucial for fibrinolysis regulation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hemostasis and Thrombosis

Background:

  • Fibrinogen is a precursor to fibrin, a key component of blood clots.
  • Tissue-type plasminogen activator (t-PA) is essential for dissolving blood clots by activating plasminogen.
  • The precise mechanisms by which fibrin influences plasminogen activation by t-PA are not fully understood.

Purpose of the Study:

  • To investigate the molecular basis of fibrin-mediated enhancement of plasminogen activation by t-PA.
  • To identify specific sites within fibrinogen/fibrin involved in this rate enhancement.
  • To elucidate the role of fibrin structure and polymerization in modulating fibrinolysis.

Main Methods:

  • Enzymatic and chemical fragmentation of fibrinogen.
  • Monoclonal antibody binding studies to identify exposed sites.
  • Direct binding assays for plasminogen and t-PA.
  • Molecular modeling and analysis of 3D structures of fibrin fragments.
  • Kinetic analysis of plasminogen activation.

Main Results:

  • Fibrin, unlike fibrinogen, enhances plasminogen activation by t-PA.
  • Specific sites in fibrinogen (A alpha 148-160, FCB-5, and alpha C domains) are involved in rate enhancement.
  • These sites are buried in fibrinogen but exposed in fibrin.
  • Plasminogen binds to the FCB-2 fragment (containing A alpha 148-160), and t-PA binds to the FCB-5 fragment (containing gamma 312-324).
  • Fibrin polymerization exposes these sites and facilitates t-PA and plasminogen binding.

Conclusions:

  • Fibrin structure and polymerization are critical for efficient fibrinolysis.
  • Exposed binding sites on fibrin for plasminogen and t-PA, along with concentrating effects, explain the enhanced activation rate.
  • Understanding these molecular interactions provides insights into regulating blood clot dissolution.

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