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Related Experiment Videos

Plasminogen interactions with platelets in plasma.

B Adelman1, A Rizk, E Hanners

  • 1Department of Medicine, Medical College of Virginia, Richmond.

Blood
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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Platelets bind plasminogen upon activation in plasma, primarily through the glycoprotein (GP) IIb/IIIa complex. This binding is linked to fibrinogen interactions and can be inhibited by specific antibodies and agents like epsilon-aminocaproic acid (EACA).

Area of Science:

  • Hematology
  • Biochemistry
  • Molecular Biology

Background:

  • Plasminogen is a key protein in the fibrinolytic system.
  • Platelets play a crucial role in hemostasis and thrombosis.
  • Understanding plasminogen-platelet interactions is important for studying blood clot formation and lysis.

Purpose of the Study:

  • To investigate the binding of plasminogen to platelets in plasma.
  • To identify the specific platelet receptors and mechanisms involved in plasminogen binding.
  • To explore the role of fibrinogen in plasminogen-platelet interactions.

Main Methods:

  • Fluorescent flow cytometry-based assay.
  • Platelet-rich plasma (PRP) stimulation with adenosine-5'-diphosphate (ADP) or thrombin.

Related Experiment Videos

  • Inhibition studies using monoclonal antibodies (LJ-CP8, 6D1), EDTA, RGD peptide analogues (GRGDS, SDGRG), antithrombospondin antibody, and epsilon-aminocaproic acid (EACA).

    • Main Results:

    • Activated platelets in PRP bind plasminogen.
    • Binding is inhibited by anti-GP IIb/IIIa antibody (LJ-CP8), EDTA, and GRGDS, indicating involvement of the GP IIb/IIIa complex.
    • Epsilon-aminocaproic acid (EACA) inhibits plasminogen binding.
    • Plasminogen and fibrinogen bind to both activated and resting platelets via GP IIb/IIIa, potentially through fibrinogen.
    • Anti-GPIb antibody (6D1) and antithrombospondin antibody do not affect plasminogen binding.

    Conclusions:

    • Plasminogen binds to activated platelets in plasma via the GP IIb/IIIa complex.
    • Fibrinogen may mediate plasminogen binding to platelets through lysine binding domains.
    • Plasminogen is also associated with resting platelets through GP IIb/IIIa, possibly via fibrinogen interaction.