Immunoglobulin E (IgE) specific to Timothy grass pollen allergens (Timothy grass-specific IgE)

Immunoglobulin E (IgE) specific to Timothy grass (Phleum pratense) pollen allergens is a central mediator in the pathophysiology of seasonal allergic rhinitis and asthma. These polyclonal antibodies are produced by B cells and plasma cells following sensitization to major Timothy grass allergens, such as Phl p 1 and Phl p 5 (Gould et al., 2003, Nature). Once synthesized, these IgE molecules bind with high affinity to the FcεRI receptor on the surface of mast cells and basophils, effectively acting as surrogate receptors for the allergen (Sutton and Gould, 1993, Nature). They also interact with the low-affinity CD23 receptor on B cells, which plays a role in regulating IgE synthesis and antigen presentation. Upon subsequent exposure to Timothy grass pollen, the allergens cross-link the surface-bound IgE, triggering the immediate release of inflammatory mediators like histamine and leukotrienes, which drive the clinical symptoms of allergy (Galli et al., 2008, Nature). Therapeutic strategies targeting this pathway include the monoclonal antibody Omalizumab, which binds to the Cε3 domain of free IgE to prevent its interaction with FcεRI (National Center for Biotechnology Information, 2023, PubChem). Additionally, allergen-specific immunotherapy (AIT) utilizes Timothy grass pollen extracts to induce immunological tolerance, often characterized by a shift from an IgE-mediated response to a protective IgG4-mediated response (Durham and Penagos, 2016, Journal of Allergy and Clinical Immunology). This target is fundamental to both the diagnosis and management of grass pollen-induced allergic diseases.

Other names

Phleum pratense-specific IgEAnti-Timothy grass IgEPhl p-specific IgEGrass pollen-specific IgE

Neutralization of free IgE to prevent binding to FcεRI receptors and induction of allergen-specific IgG4-mediated tolerance.