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Related Experiment Videos

Reciprocating autocatalytic interactions between platelets and the activation system

H Ouimet1, J Loscalzo

  • 1Cardiovascular Division, Brigham and Women's Hospital, Boston, Massachusetts.

Thrombosis Research
|June 1, 1993
PubMed
Summary

Plasmin (Pn) enhances plasminogen (PGN) activation on platelet surfaces by increasing PGN binding sites and t-PA catalytic efficiency. This suggests a self-amplifying mechanism in platelet-mediated PGN activation without activating platelets.

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Area of Science:

  • Hematology
  • Biochemistry
  • Molecular Biology

Background:

  • Platelet surfaces normally facilitate plasminogen (PGN) and tissue-type plasminogen activator (t-PA) assembly for PGN activation.
  • The resulting plasmin (Pn) can influence platelet properties, necessitating an understanding of its role in PGN activation.

Purpose of the Study:

  • To investigate the effects of plasmin (Pn) on platelet-surface PGN activation.
  • To determine if Pn modulates PGN and t-PA binding and PGN activation kinetics on unactivated platelets.

Main Methods:

  • Platelets were incubated with plasmin (Pn).
  • Binding of PGN, Pn, and t-PA to unactivated platelets was measured.
  • Kinetics of PGN activation on the platelet surface were analyzed.

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Main Results:

  • Pn treatment significantly increased PGN binding sites by 78% without altering affinity.
  • Pn treatment modestly affected Pn binding but did not change t-PA binding.
  • Catalytic efficiency of t-PA increased approximately two-fold, with no evidence of platelet activation.

Conclusions:

  • Platelet-surface PGN activation may be an autocatalytic process.
  • A unique reciprocating mechanism likely governs platelet and plasminogen activation system interactions.