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Detection and characterization of circulating immune complexes in peptic ulcer
S Begum1, M Ishaq, C M Habibullah
1Department of Genetics, Osmania University, Hyderabad, Andhra Pradesh, India.
The National Medical Journal of India
|November 1, 1992
Summary
Patients with peptic ulcers show evidence of circulating immune complexes, particularly involving immunoglobulin A (IgA). These immune complexes may disrupt normal immune system regulation in peptic ulcer disease.
Area of Science:
- Immunology
- Gastroenterology
Background:
- Immunological factors are implicated in peptic ulcer disease.
- Autoantibodies against immunoglobulin A (IgA) have been observed in patients.
Purpose of the Study:
- To investigate the presence of circulating immune complexes in peptic ulcer patients.
- To identify the immunoglobulins involved in these complexes.
Main Methods:
- Polyethylene glycol (PEG) assay used to detect circulating immune complexes in 37 duodenal ulcer and 8 gastric ulcer patients.
- Immunoglobulin (IgA, IgG, IgM) levels in precipitates and serum analyzed using radial immunodiffusion.
- ELISA test for autoantibodies against IgA.
Main Results:
- Circulating immune complexes detected in 11 patients (6 duodenal, 5 gastric ulcer).
- Significantly higher mean protein content in PEG precipitates from patients versus controls (p < 0.001).
- Elevated levels of all immunoglobulin isotypes in patients; IgA content higher in positive cases (p < 0.05).
Conclusions:
- Peptic ulcer patients exhibit circulating immune complexes.
- These complexes may play a role in the pathogenesis by interfering with immunoregulation.