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IgG subclass deficiencies associated with bronchiectasis

J De Gracia1, M J Rodrigo, F Morell

  • 1Servei de Pneumologia, Hospital General Universitari Vall d'Hebron, Barcelona, Spain.

American Journal of Respiratory and Critical Care Medicine
|February 1, 1996
PubMed
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Immunoglobulin G subclass deficiencies (IgGSD) are a significant, often overlooked cause of bronchiectasis. Testing IgG subclasses is crucial when other causes are ruled out.

Area of Science:

  • Immunology
  • Pulmonology
  • Clinical Medicine

Background:

  • Bronchiectasis etiology is often unclear, with IgG subclass deficiencies (IgGSD) rarely considered.
  • Previous studies show limited association between IgGSD and bronchiectasis.

Purpose of the Study:

  • To investigate the prevalence of IgGSD in patients with unexplained bronchiectasis.
  • To assess the impact of IgGSD on pulmonary function and antibody response.

Main Methods:

  • Serum IgG subclasses (1-4) and specific antibodies to Haemophilus influenzae type b (Hib-PRP) were measured using ELISA in 65 bronchiectasis patients and healthy controls.
  • Pulmonary function tests were conducted.
  • Age-stratified normal ranges for IgG subclasses were established.

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Main Results:

  • 48% of patients had one or more IgGSD (19 IgG2, 2 IgG3, 3 IgG4, 7 combined).
  • Patients with IgGSD exhibited impaired antibody response to Hib-PRP compared to non-IgGSD patients and controls.
  • Elevated total IgG, IgG1, and IgA were observed, higher in patients without IgGSD.

Conclusions:

  • IgGSD, especially IgG2 deficiency, are a notable cause of bronchiectasis.
  • Assaying serum IgG subclasses is recommended for patients with unexplained bronchiectasis.