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Related Experiment Videos

Control of human plasminogen activation.

F J Castellino1, T Urano, V de Serrano

  • 1Department of Chemistry, University of Notre Dame, Indiana 46556.

Haemostasis
|January 1, 1988
PubMed
Summary

Anions like chloride inhibit plasminogen activation by streptokinase and urokinase, but fibrinogen and epsilon-aminocaproic acid can counteract this effect, revealing key regulatory mechanisms.

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Area of Science:

  • Biochemistry
  • Molecular Biology

Background:

  • Plasminogen activation is tightly regulated by various molecules.
  • Anions, including chloride, have been identified as novel regulators of this process.

Purpose of the Study:

  • To elucidate the biochemical mechanisms underlying plasminogen activation by streptokinase (SK) and urokinase (UK).
  • To investigate the modulatory roles of anions, fibrinogen (Fg), fibrin (Fn), and epsilon-aminocaproic acid (EACA) in these activation pathways.

Main Methods:

  • Characterization of activator complexes formed between Glu1-plasminogen (Glu-Pg) and activators (SK, UK).
  • Enzymatic assays to determine the effects of anions (Cl-), Fg, Fn, and EACA on activation rates and kinetics.
  • Kinetic analysis to determine inhibition (Ki) and activation (Ka) constants.

Main Results:

  • SK-mediated Glu-Pg activation involves distinct intermediate complexes with varying sensitivity to inhibitors and activators.
  • Chloride ions act as mixed inhibitors (Ki: 6.4-9.2 mM) in SK-mediated activation, with Fg acting as a mixed activator (Ka: 110-240 nM).
  • UK-mediated Glu-Pg activation is inhibited by Cl- but stimulated by EACA, with EACA overcoming Cl- inhibition.

Conclusions:

  • Chloride significantly inhibits Glu-Pg activation by SK in physiological conditions unless Fg is present.
  • EACA can effectively counteract Cl- inhibition in UK-mediated plasminogen activation.
  • These findings highlight the complex interplay of regulatory molecules in controlling fibrinolysis.

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