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[Determination of specific IgG4 in allergy]
1Laboratoires Pharmacia, Angers.
Allergie Et Immunologie
|September 1, 1987
Summary
Measuring specific IgG4 antibody levels using ELISA can help monitor immunotherapy for insect venom and grass pollen allergies. However, elevated IgG4 may indicate poor treatment outcomes or simply a mucosal marker in food allergies, not a disease indicator.
Area of Science:
- Immunology
- Allergy diagnostics
- Immunotherapy monitoring
Context:
- Specific immunotherapy (IS) for hymenoptera venom and grass pollens requires objective monitoring methods.
- The role of specific IgG4 antibodies in allergic diseases is not fully understood.
- Distinguishing between pathological reactions and mucosal markers is crucial in allergy diagnosis.
Purpose:
- To evaluate the utility of specific IgG4 titre measurement by ELISA in controlling specific immunotherapy (IS) for hymenoptera venom and grass pollens.
- To determine if specific IgG4 can serve as a diagnostic indicator for food allergy.
Summary:
- Elevated specific IgG4 titres within the first 3 months of IS, or pre-existing high titres, correlate with poor clinical outcomes in venom and pollen immunotherapy.
- Specific IgG4 antibodies are frequently found in control subjects without food allergies, indicating they are not a reliable diagnostic marker for food allergy.
- In food allergy, specific IgG4 appears to represent a mucosal marker rather than a direct indicator of a pathological allergic reaction.
Impact:
- Provides objective criteria for monitoring the effectiveness of specific immunotherapy for insect venom and grass pollen allergies.
- Clarifies the limited diagnostic value of specific IgG4 in food allergy, preventing misdiagnosis.
- Suggests a potential role for specific IgG4 as a mucosal immune response marker.