Protein allergen

Protein allergens are a heterogeneous class of proteins derived from various environmental sources—such as pollens, dust mites, animal dander, and foods—that elicit IgE-mediated hypersensitivity in sensitized individuals (WHO/IUIS Allergen Nomenclature, allergen.org). These proteins possess specific epitopes that are recognized by the immune system, leading to the synthesis of allergen-specific IgE antibodies that sensitize mast cells and basophils (Galli et al., 2008, Nature). Upon re-exposure, the allergen cross-links IgE on these effector cells, triggering the degranulation and release of inflammatory mediators like histamine and leukotrienes, which drive the clinical manifestations of allergic diseases including asthma, rhinitis, and anaphylaxis (Pawankar et al., 2011, World Allergy Organization). In clinical pharmacology, protein allergens serve as the active components in allergen immunotherapy (AIT), a disease-modifying treatment aimed at inducing long-term immunological tolerance (Jutel et al., 2015, JACI). By administering gradually increasing doses of the specific allergen, AIT shifts the immune profile from a Th2-dominant allergic response toward a regulatory environment characterized by increased IL-10 production and allergen-specific IgG4 antibodies (Shamji et al., 2017, Allergy).

Other names

Allergenic proteinAntigenAeroallergenFood allergenEnvironmental allergen

Allergen immunotherapy (AIT) involves the repeated administration of specific protein allergens to induce clinical and immunological tolerance, shifting the immune response from Th2-driven inflammation to regulatory T cell (Treg) and Th1-mediated responses (Jutel et al., 2015, JACI).