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Related Experiment Videos

Thrombin-triggered platelet apoptosis.

V Leytin1, D J Allen, S Mykhaylov

  • 1Division of Transfusion Medicine, Department of Laboratory Medicine, St Michael's Hospital, Toronto, ON, Canada. leytinv@smh.toronto.on.ca

Journal of Thrombosis and Haemostasis : JTH
|September 12, 2006
PubMed
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Thrombin, a known coagulation factor, triggers programmed cell death (apoptosis) in human platelets. This action involves mitochondrial changes, altered protein expression, caspase activation, and phosphatidylserine exposure.

Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Thrombin is a key coagulation factor known for platelet activation and aggregation.
  • Previous research indicates thrombin influences apoptosis in nucleated cells.

Purpose of the Study:

  • Investigate thrombin's effect on apoptosis in anucleated human platelets.
  • Determine if thrombin can induce programmed cell death in platelets.

Main Methods:

  • Single-cell analysis of platelet apoptosis using flow cytometry.
  • Assessment of mitochondrial and cytoplasmic apoptotic markers.
  • Western blotting to analyze Bcl-2 family protein expression.

Main Results:

  • Thrombin induced mitochondrial inner transmembrane potential depolarization.

Related Experiment Videos

  • Observed increased Bax and Bak, decreased Bcl-2 protein expression.
  • Confirmed caspase-3 activation and phosphatidylserine exposure.

    • Conclusions:

    • Thrombin acts as a death ligand, triggering platelet apoptosis beyond its activation role.
    • Thrombin impacts multiple apoptotic pathways in platelets.
    • Data suggest thrombin shifts Bcl-2 protein balance, affecting mitochondrial function and activating caspases.