Ragweed pollen-specific immunoglobulin E (IgE)

Ragweed pollen-specific immunoglobulin E (IgE) refers to antibodies produced by the immune system in response to allergens in ragweed (Ambrosia artemisiifolia) pollen, primarily targeting major allergens such as Amb a 1 isoforms and others like Amb a 4, Amb a 6, and Amb a 8. These IgE antibodies bind to mast cells and basophils via FcεRI receptors, triggering degranulation and release of mediators like histamine upon re-exposure to ragweed pollen, leading to allergic symptoms including rhinoconjunctivitis (>95% of patients), asthma-like symptoms (~60%), and skin reactions (~25%). Patients exhibit complex IgE reactivity profiles, with 19 distinct patterns identified by immunoblotting, often involving multiple ragweed allergens and cross-reactive carbohydrate determinants (CCDs), which can complicate diagnosis. Elevated ragweed-specific IgE levels serve as a diagnostic biomarker, detectable in ~90% of skin prick test-positive patients via assays like ImmunoCAP targeting Amb a 1, though not all patients show reactivity due to denaturation-sensitive epitopes. This immune response drives seasonal allergic rhinoconjunctivitis and related conditions in ragweed-infested areas, exacerbated by climate change, but it is not a therapeutic target like a receptor or enzyme; instead, it is measured for component-resolved diagnostics and allergen immunotherapy selection. Complex profiles correlate with more severe multi-symptom presentations, highlighting the need for comprehensive allergen testing beyond single components like Amb a 1.

Other names

Ragweed-specific IgEAmbrosia artemisiifolia pollen-specific IgE