Immunoglobulin E (IgE) E is secreted by plasma cells as a monomer during the adaptive immune response. IgE antibodies are believed to play an important role in the immune defense against parasitic infections and in hypersensitivity type I reactions upon re-exposure to a specific allergen by binding to and cross-linking Fc receptors (FcεRI) expressed on mast cells and basophils. Allergen-specific IgE is the basis for many in vitro assays for allergy diagnosis. In mice, two allotypes exist: IgEa and IgEb. IgEa differs by 12 single-base changes from IgEb and is present in different mouse strains.
| Alternative analyte names: | Immunoglobulin Ea, IgEa |
| Cell types: | B cell |
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