T-cell receptor (TCR) recognizing timothy grass allergen peptides (TCR)

The T-cell receptor (TCR) recognizing timothy grass allergen peptides is a specialized immune receptor that plays a central role in the development and manifestation of seasonal allergies (Wambre et al., 2011). These receptors are expressed on CD4+ T-cells and specifically identify peptide fragments from major timothy grass allergens, such as Phl p 1 and Phl p 5, when they are presented by Major Histocompatibility Complex (MHC) class II molecules (Archila et al., 2014). In individuals with hay fever, the binding of these TCRs to allergen-MHC complexes triggers a Th2-polarized immune response, leading to the release of pro-inflammatory cytokines like IL-4, IL-5, and IL-13. This signaling cascade ultimately results in the production of allergen-specific IgE and the activation of mast cells and eosinophils, which cause the clinical symptoms of allergic rhinitis and asthma. Therapeutic interventions, specifically allergen-specific immunotherapy (AIT), target this TCR-mediated pathway to induce long-term immunological tolerance (Akdis & Akdis, 2014). By administering controlled doses of timothy grass extracts, such as Grazax or Itulatek, AIT promotes the differentiation of regulatory T-cells (Tregs) that suppress the allergic response through the secretion of IL-10 and TGF-beta. Consequently, the TCR's interaction with the allergen is modulated from a state of hypersensitivity to one of immune deviation or anergy, providing symptomatic relief and potentially modifying the course of the disease. Monitoring these specific T-cell populations using MHC-peptide tetramers has become a vital tool in assessing the efficacy of such immunotherapies in clinical trials (Wambre et al., 2014).

Other names

Timothy grass allergen-specific T-cell receptorPhl p-specific TCRGrass pollen-specific T-cell receptorPhleum pratense-specific TCR

Allergen-specific immunotherapy (AIT) modulates the T-cell receptor response by inducing immunological tolerance through T-cell anergy, deletion, or the induction of regulatory T-cells (Tregs) that secrete suppressive cytokines like IL-10 and TGF-beta (Akdis & Akdis, 2014).