IgG subclasses in the serum and sputum from patients with bronchiectasis
Open Access
- 1 June 1998
- Vol. 53 (6), 463-468
- https://doi.org/10.1136/thx.53.6.463
Abstract
BACKGROUND IgG subclass deficiency is often associated with recurrent pulmonary infections. The prevalence of deficiency in a large well characterised group of patients with bronchiectasis has not previously been established. METHODS Serum IgG subclass concentrations in 89 patients with bronchiectasis were compared with those obtained from a group of 82 age and sex matched normal healthy controls. Sputum IgG subclass concentrations were also assessed in 44 of the patients. Albumin was measured as a marker of protein transudation from plasma to determine the degree of local IgG subclass production. RESULTS The serum concentrations of IgG1, IgG2 and IgG3 were increased in the patients compared with the control group whereas IgG4 concentrations were not. There was an overall incidence of deficiency of 1% for subclasses 1–3 and 5% for subclass 4 in patients with bronchiectasis based on observed concentrations being below the lower limit of the control group range. The concentrations of IgG subclasses in sputum were partly dependent upon the degree of inflammation as assessed by the macroscopic appearance of purulence. A comparison of the ratio of sputum:serum subclass concentration and sputum:serum albumin, however, revealed that all of the subclasses were present at greater concentrations than could be accounted for by transudation alone. CONCLUSIONS A new normal control range for serum IgG subclasses has been established and from this range it was found that IgG subclass deficiency in a group of unselected patients with bronchiectasis was comparatively rare. A significant degree of local IgG production was also suggested in the lungs of these patients.Keywords
This publication has 23 references indexed in Scilit:
- Serum IgG subclass concentrations in healthy subjects at different age: Age normal percentile chartsEuropean Journal of Pediatrics, 1989
- Bronchiectasis—New Therapeutic Approaches Based on PathogenesisClinics in Chest Medicine, 1987
- SERUM IgG SUBCLASSES IN PATIENTS WITH AN INCREASED SUSCEPTIBILITY TO RESPIRATORY TRACT INFECTIONSAustralian and New Zealand Journal of Medicine, 1987
- Short term response of patients with bronchiectasis to treatment with amoxycillin given in standard or high doses orally or by inhalation.Thorax, 1986
- Immunoglobulin G Subclass Proteins in Serum and Lavage Fluid of Normal SubjectsAmerican Review of Respiratory Disease, 1985
- Elastolytic activity of sputum and its relation to purulence and to lung function in patients with bronchiectasis.Thorax, 1984
- Atopy, immunological changes, and respiratory function in bronchiectasis.Thorax, 1984
- SERUM IGG SUBCLASS CONCENTRATIONS IN HEALTHY-ADULTS - A STUDY USING MONOCLONAL ANTISERA1984
- SERUM IGG SUBCLASSES IN CHRONIC AND RECURRENT RESPIRATORY-INFECTIONS1984
- Distribution of immunoglobulin-containing cells in the bronchial mucosa of patients with chronic respiratory disease.1982