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Related Concept Videos

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Ferric Chloride-induced Thrombosis Mouse Model on Carotid Artery and Mesentery Vessel
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[The functional study of antithrombin L99 mutation].

Tingting Yu1, Jing Dai1, Qiulan Ding1

  • 1Clinical Laboratory Department, Ruijin Hospital of Shanghai Jiaotong University School of Medicine, Shanghai 200025, China.

Zhonghua Xue Ye Xue Za Zhi = Zhonghua Xueyexue Zazhi
|March 27, 2014
PubMed
Summary

The L99 mutation in antithrombin (AT) impairs its binding to heparin, thrombin, and FXa, leading to reduced AT activity and inherited AT deficiency. This study elucidates the molecular basis of this condition.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Context:

  • Inherited antithrombin (AT) deficiency is a genetic disorder predisposing individuals to thrombosis.
  • The L99 mutation is implicated in AT deficiency, but its precise molecular mechanisms require elucidation.

Purpose:

  • To investigate the molecular mechanisms underlying inherited antithrombin (AT) deficiency caused by the AT L99 mutation.
  • To assess the impact of specific L99 mutations (L99V, L99A, L99I, L99S) on AT's binding affinities and activity.

Summary:

  • Wild-type (WT) and mutant AT proteins (L99V, L99A, L99I, L99S) were expressed and purified.
  • Binding assays revealed significantly reduced affinity of mutant AT for heparin, thrombin (FIIa), and coagulation factor Xa (FXa).
  • Chromogenic assays demonstrated a marked decrease in AT activity (AT:A) for most L99 mutants.

Impact:

  • The L99 mutation disrupts critical interactions of AT with heparin and its targets, leading to impaired anticoagulant function.
  • Understanding these molecular defects provides insights into the pathogenesis of inherited AT deficiency.
  • This research contributes to the molecular understanding of thrombophilia and may inform future therapeutic strategies.