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Related Experiment Videos

Internalization of bound fibrinogen modulates platelet aggregation

J D Wencel-Drake1, C Boudignon-Proudhon, M G Dieter

  • 1Department of Medical Laboratory Sciences, University of Illinois at Chicago 60612, USA.

Blood
|January 15, 1996
PubMed
Summary

Platelet aggregation involves fibrinogen binding to integrin alpha IIb beta 3. Internalization of this bound fibrinogen leads to irreversible binding and reduced platelet aggregation, regulating platelet function.

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Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Platelet aggregation is crucial for hemostasis.
  • Integrin alpha IIb beta 3 (glycoprotein IIb-IIIa) mediates fibrinogen binding and platelet aggregation.
  • Platelets exhibit agonist-induced activation leading to fibrinogen receptor conversion.

Purpose of the Study:

  • To investigate the role of fibrinogen internalization in platelet aggregation.
  • To determine if fibrinogen internalization contributes to irreversible fibrinogen binding and loss of aggregation capacity.

Main Methods:

  • Fluorescence microscopy to track internalized biotinylated fibrinogen.
  • Flow cytometry to assess extracellular probe accessibility and platelet aggregation.
  • Manipulation of conditions to prevent irreversible fibrinogen binding.

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Main Results:

  • Activated platelets rapidly internalize bound fibrinogen into an intracellular pool.
  • Internalization precedes the loss of platelet aggregation capacity.
  • Preventing irreversible fibrinogen binding inhibits internalization and preserves aggregation.

Conclusions:

  • Fibrinogen internalization contributes to irreversible binding and downregulation of platelet adhesiveness.
  • Internalization of fibrinogen is a key regulatory mechanism modulating platelet function.