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[Thrombosis and thrombin].

H C Hemker1, S Béguin

  • 1Département de Biochimie, Université du Limbourg, Maastricht, Pays-Bas.

Annales Pharmaceutiques Francaises
|January 1, 1992
PubMed
Summary

Low molecular weight heparins primarily inhibit thrombin, not factor Xa, contrary to current beliefs. The thrombin potential, not anti-factor Xa activity, should measure anticoagulant drug effectiveness.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Hematology

Context:

  • Thrombosis is a leading cause of mortality, with thrombin formation central to its pathogenesis.
  • Current anticoagulants like heparin and vitamin K antagonists target thrombin formation.
  • There is an urgent need for improved antithrombotic therapies.

Purpose:

  • To elucidate the mechanism of thrombin formation.
  • To discuss the inhibitory actions of conventional and low molecular weight heparins.
  • To propose a new metric for evaluating anticoagulant drug efficacy.

Summary:

  • Low molecular weight heparins (LMWHs) primarily inhibit thrombin directly and indirectly through feedback loops.
  • Contrary to existing understanding, LMWHs' main action is on thrombin, with less importance on factor Xa inhibition.
  • The study explains the mechanism of thrombin generation and how heparins interfere with it.

Impact:

  • Challenges the prevailing view on LMWH's mechanism of action.
  • Suggests that the time-concentration integral of thrombin (thrombin potential) is a superior measure for anticoagulant efficacy.
  • Provides a foundation for developing more effective antithrombotic drugs.

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