Immunoglobulin G antibodies specific for Populus alba pollen allergens (IgG anti-Pop a)

Immunoglobulin G (IgG) antibodies specific for Populus alba (White Poplar) pollen allergens are immune effector proteins that play a critical role in the modulation of allergic diseases. While IgE antibodies are the primary drivers of Type I hypersensitivity reactions to poplar pollen, specific IgG antibodies—particularly the IgG4 subclass—are associated with the development of immunological tolerance (Shamji & Durham, 2017, PubMed: 28233539). These antibodies function as blocking antibodies by competing with IgE for binding to major allergens such as Pop a 1, a pathogenesis-related protein (PR-10) found in Populus alba pollen (Allergome, 2024). By sequestering the allergen before it can cross-link IgE on the surface of mast cells and basophils, these IgG antibodies inhibit the release of inflammatory mediators like histamine (Akdis & Akdis, 2014, PubMed: 24636084). In clinical settings, the induction of these antibodies is a primary goal of allergen immunotherapy (AIT), and their levels are frequently monitored as biomarkers of treatment efficacy and desensitization (James & Durham, 2008, PubMed: 19302582). Consequently, they are not targets for inhibition but rather therapeutic products of immune modulation used to counteract allergic rhinitis and asthma.

Other names

Anti-Populus alba IgGWhite poplar pollen-specific IgGPop a-specific IgGPopulus alba-specific immunoglobulin G

Allergen immunotherapy (AIT) induces the production of allergen-specific IgG antibodies (particularly the IgG4 subclass) that act as blocking antibodies by competing with IgE for binding to allergens, thereby preventing mast cell degranulation and the subsequent allergic cascade (PubMed: 24636084).