An immunoperoxidase assay for serum ragweed-specific IgE

Area of Science:

• Immunology
• Allergy diagnostics
• Enzyme immunoassays

Background:

• Serum allergen-specific IgE antibodies are crucial biomarkers for allergic diseases.
• Radioallergosorbent test (RAST) is a common method for IgE detection but has limitations.

Purpose of the Study:

• To describe a novel solid-phase enzyme immunoassay for quantifying allergen-specific IgE antibodies in serum.
• To evaluate the performance of this assay compared to the RAST technique.

Main Methods:

• Allergen-specific IgE antibodies in serum bind to microtiter plates pre-adsorbed with allergens.
• Bound antibodies are detected using rabbit antihuman IgE labeled with horseradish peroxidase.
• Enzyme activity is quantified spectrophotometrically using O-phenylene diamine substrate.

Main Results:

• The immunoperoxidase assay demonstrated 90% concordance with RAST for antiragweed IgE in patients with ragweed hayfever.
• Coefficients of variation ranged from 4.4% to 14%, indicating good reproducibility.
• Standard curves were generated and compared between the new method and RAST.

Conclusions:

• The described solid-phase enzyme immunoassay is a viable and accurate method for detecting allergen-specific IgE.
• Peroxidase offers advantages as an enzymatic marker for IgE assays.
• This assay provides a reliable alternative for allergy diagnosis.