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Related Experiment Videos

Angioedema and oral contraception.

L Bouillet1, D Ponard, C Drouet

  • 1Département pluridisciplinaire de médecine, Service de médecine interne, Hôpital Sud, CHU de Grenoble, France. LBouilletClaveyrolas@chu-grenoble.fr

Dermatology (Basel, Switzerland)
|February 20, 2003
PubMed
Summary

Oral contraceptives can trigger hereditary angioedema (ANE) attacks. Stopping the pill resolved ANE symptoms and normalized C1 inhibitor function in studied patients.

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Area of Science:

  • Immunology
  • Genetics

Background:

  • Oral contraceptives are known to precipitate hereditary angioedema (ANE) attacks.
  • They can also induce acquired forms of the condition.

Purpose of the Study:

  • To investigate the clinical and biological characteristics of patients experiencing ANE triggered by oral contraceptives.
  • To observe the effects of discontinuing oral contraception on ANE symptoms and biological markers.

Main Methods:

  • Studied five patients with ANE that began under oral contraception.
  • Explored clinical presentation and performed biological assessments including serum C4 and C1 inhibitor (C1Inh) antigen and activity levels.
  • Utilized immunoblotting to detect protein cleavage.

Main Results:

  • Symptoms of ANE, including swelling of lips, hands, larynx, and abdomen, developed within the first year or later after starting oral contraceptives.
  • Patients exhibited normal serum C4 and C1 inhibitor (C1Inh) antigen levels but reduced C1Inh activity with significant protein cleavage.
  • Discontinuation of oral contraceptives led to symptom regression and normalization of C1Inh function.

Conclusions:

  • The precise mechanism underlying oral contraceptive-induced ANE remains unknown.
  • Potential mechanisms include modulation of C1Inh expression by androgens or an imbalance in coagulation proteins leading to C1Inh cleavage.

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