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Related Experiment Videos

In vitro interaction of C1-inhibitor with thrombin.

M Cugno1, I Bos, Y Lubbers

  • 1Department of Internal Medicine, IRCCS Maggiore Hospital, University of Milan, Milan, Italy. massimo.cugno@unimi.it

Blood Coagulation & Fibrinolysis : an International Journal in Haemostasis and Thrombosis
|July 19, 2001
PubMed
Summary

C1-inhibitor (C1-INH) interacts with thrombin, forming complexes and cleavage products in purified systems. This interaction appears limited in plasma, suggesting a minor role in circulating blood but potential importance at the endothelial surface.

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Area of Science:

  • Biochemistry
  • Immunology
  • Hematology

Background:

  • Acute angioedema attacks show increased thrombin generation in C1-inhibitor deficient patients.
  • C1-inhibitor (C1-INH) is a key regulator of the complement system and other proteases.

Purpose of the Study:

  • To investigate the interaction between C1-inhibitor and thrombin.
  • To determine the functional consequences of this interaction in purified systems and human plasma.

Main Methods:

  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting.
  • Enzyme-linked immunosorbent assays (ELISAs) for complex detection.
  • Kinetic studies using chromogenic assays.

Main Results:

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  • Purified C1-INH formed bimolecular complexes (130,000 and 120,000 Mr) and a cleaved form (97,000 Mr) upon interaction with thrombin.
  • Second-order rate constant for thrombin inhibition by C1-INH was 19/s/mol/l, enhanced by heparin.
  • No significant C1-INH-thrombin complex formation or C1-INH cleavage was observed in human plasma.

    • Conclusions:

    • C1-INH interacts with thrombin, forming enzyme-inhibitor complexes and undergoing cleavage.
    • The low rate constant and lack of plasma interaction indicate a minor role for C1-INH in inhibiting circulating thrombin.
    • C1-INH may play a more significant role in thrombin regulation at the endothelial surface due to local glycosaminoglycan concentrations.