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Gliadin-specific IgE in wheat-dependent exercise-induced anaphylaxis
Jae-Young Lee1, Sungho Yoon, Young-Min Ye
1Department of Internal Medicine, Hallym University School of Medicine, Chuncheon, Korea.
Allergy and Asthma Proceedings
|January 29, 2009
Summary
Serum gliadin-specific IgE is a valuable supplementary diagnostic marker for wheat-dependent exercise-induced anaphylaxis (WDEIA). Elevated IgE binding to a 50 kDa gliadin component, suppressed by simulated gastric fluid, characterizes WDEIA patients.
Area of Science:
- Allergy and Immunology
- Gastroenterology
- Clinical Diagnostics
Background:
- Food-dependent exercise-induced anaphylaxis is a distinct allergic reaction.
- Recent research highlights gliadin as a primary allergen in wheat-dependent exercise-induced anaphylaxis (WDEIA).
Purpose of the Study:
- To assess the diagnostic utility of serum gliadin-specific IgE for WDEIA.
- To characterize the IgE-binding properties and digestibility of gliadin components.
Main Methods:
- Analysis of 32 wheat-sensitized adults (26 asymptomatic, 6 with WDEIA).
- Measurement of wheat flour and gliadin-specific IgE levels.
- Receiver operator characteristic (ROC) curve analysis.
- IgE immunoblotting of gliadin extracts with and without simulated gastric and intestinal fluid incubation.
Main Results:
- WDEIA patients exhibited significantly higher gliadin-specific IgE levels compared to non-WDEIA subjects (p = 0.003).
- The ROC curve analysis indicated gliadin-specific IgE has a diagnostic area of 0.872, suggesting its supplementary diagnostic value.
- All WDEIA patients showed strong IgE binding to a 50 kDa gliadin component, which was reduced by simulated gastric fluid but minimally affected by intestinal fluid.
Conclusions:
- Serum gliadin-specific IgE serves as a useful supplementary biomarker for diagnosing WDEIA.
- The 50 kDa gliadin component is a key allergen in WDEIA, with its IgE-binding capacity being sensitive to gastric digestion.
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