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Hereditary angioedema: Linking complement regulation to the coagulation system.

Marcel Levi1,2,3, Danny M Cohn3, Sacha Zeerleder4,5,6

  • 1Department of Medicine University College London Hospitals NHS Foundation Trust London UK.

Research and Practice in Thrombosis and Haemostasis
|January 19, 2019
PubMed
Summary
This summary is machine-generated.

Hereditary angioedema, caused by C1 inhibitor deficiency, involves bradykinin. Despite affecting coagulation and fibrinolysis, it doesn't cause bleeding or clotting issues, even with C1 inhibitor concentrate treatment.

Keywords:
C1 inhibitorbradykinincontact systemfactor XIIhereditary angioedemaplasmin

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Area of Science:

  • Immunology
  • Complement System
  • Hemostasis

Background:

  • Congenital C1 inhibitor deficiency causes hereditary angioedema (HAE).
  • Bradykinin dysregulation by insufficient C1 inhibitor is key in HAE pathogenesis.
  • C1 inhibitor also regulates coagulation and fibrinolysis.

Purpose of the Study:

  • Investigate C1 inhibitor deficiency effects on coagulation and fibrinolysis.
  • Assess the relevance for in vivo hemostasis and thrombo-embolic disease.
  • Evaluate hemostatic risks associated with C1 inhibitor replacement therapy.

Main Methods:

  • Review of current literature on C1 inhibitor deficiency and related pathways.
  • Analysis of clinical observations regarding hemostasis in HAE patients.
  • Assessment of outcomes following C1 inhibitor concentrate administration.

Main Results:

  • C1 inhibitor deficiency significantly activates coagulation and fibrinolysis pathways.
  • Despite pathway activation, HAE patients do not exhibit hemorrhagic or prothrombotic tendencies.
  • Restoration of C1 inhibitor levels via concentrate therapy does not induce thrombotic complications.

Conclusions:

  • Hereditary angioedema pathogenesis involves complex interactions beyond simple pathway activation.
  • C1 inhibitor deficiency does not predispose patients to bleeding or thrombosis.
  • C1 inhibitor replacement therapy is safe regarding hemostatic complications.