Background: Knowledge of human IgG subclass antibody responses to various allergens has been hampered by a lack of reliable standardized assays. The aim here was to develop quantitative immunoassays for human IgG1, IgG2, and IgG3 antibodies using ImmunoCAP® technology and to evaluate their application. Methods: Enzyme conjugates with isotype-specific monoclonal antibodies and calibrators composed of purified myeloma paraproteins were developed for each assay and used together with other standardized assay reagents for the Phadia® 100 instrument. The calibrators were adjusted to the international reference preparation IRP 67/86. The assays were characterized and used together with other standard ImmunoCAP assays to measure antibodies to various allergens in preliminary studies. Results: The new assays had limits of quantitation of 1.0 (IgG1), 4.6 (IgG2), and 0.04 mgA/L (IgG3), and coefficients of variation of Conclusions: The new research assays are valuable tools for immunological studies, enabling the characterization of antibody profiles using a standardized approach, and facilitating data interpretation and the comparison of results across studies.
Int Arch Allergy Immunol 2017;172:1-10
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