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Thiol isomerases in thrombus formation.

Bruce Furie1, Robert Flaumenhaft

  • 1From the Division of Hemostasis and Thrombosis, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA.

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|March 29, 2014
PubMed
Summary
This summary is machine-generated.

Protein disulfide isomerase (PDI) and related thiol isomerases are crucial for thrombus formation. Inhibiting PDI blocks platelet aggregation and fibrin generation, highlighting their role in thrombosis.

Keywords:
antiplatelet agentsantithrombotic agentsblood plateletsplatelet aggregation inhibitorthrombosis

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Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Thrombus formation, critical in cardiovascular diseases, involves complex molecular interactions.
  • Thiol isomerases, including protein disulfide isomerase (PDI), ERp5, and ERp57, are implicated in platelet function and thrombosis initiation.

Purpose of the Study:

  • To investigate the role of thiol isomerases, particularly PDI, ERp5, and ERp57, in the initiation of arterial thrombus formation.
  • To elucidate the mechanisms by which these enzymes interact with platelet integrins and contribute to fibrin generation.

Main Methods:

  • Utilized a laser injury thrombosis model in mice to study in vivo arterial thrombus formation.
  • Investigated PDI secretion by platelets and endothelial cells upon activation.
  • Examined the interaction of thiol isomerases with integrins αIIbβ3 and αVβ3.
  • Employed trapping mutant forms to identify thiol isomerase substrates and pathways.

Main Results:

  • Thrombus formation was associated with PDI secretion by platelets and endothelial cells.
  • Inhibition of PDI significantly blocked platelet thrombus formation and fibrin generation.
  • ERp5 and ERp57 were also shown to be important in thrombus initiation.
  • Integrins αIIbβ3 and αVβ3 directly interact with PDI, ERp5, and ERp57.

Conclusions:

  • Thiol isomerases, especially PDI, ERp5, and ERp57, are key regulators in the initiation of thrombus formation.
  • PDI represents a potential antithrombotic target, with inhibitors like isoquercetin and quercetin 3-rutinoside being explored.
  • Further research into thiol isomerase regulation, storage, secretion, and electron transfer pathways is essential for understanding thrombosis.