Amb a 1-specific T-cell receptor (Amb a 1-specific TCR)

Amb a 1-specific T-cell receptors (TCRs) are specialized antigen-recognition complexes found on the surface of T-lymphocytes that specifically bind to peptides derived from Amb a 1, the immunodominant allergen of short ragweed (Ambrosia artemisiifolia) (Source: WHO/IUIS Allergen Nomenclature). These receptors play a pivotal role in the pathophysiology of seasonal allergic rhinitis and asthma by mediating the activation of Th2-polarized cells upon exposure to ragweed pollen. When the TCR recognizes Amb a 1 peptides presented by MHC class II molecules, it initiates a signaling cascade that promotes the secretion of pro-inflammatory cytokines such as IL-4 and IL-13 (Source: Wambre et al., 2012, Science Translational Medicine). These cytokines are essential for IgE class switching in B-cells and the subsequent recruitment of eosinophils and mast cell activation. In therapeutic contexts, these TCRs are the primary focus of allergen-specific immunotherapy (AIT), such as Ragwitek, which aims to desensitize the immune system and induce long-term tolerance (Source: FDA, Ragwitek Prescribing Information). By modulating the activity and phenotype of T-cells bearing these receptors, treatments can shift the immune profile from an allergic Th2 response to a protective Th1 or regulatory T-cell response. Consequently, Amb a 1-specific TCRs serve as critical molecular focal points for both the induction of allergic disease and its clinical management through immunotherapy.

Other names

Ambrosia artemisiifolia allergen 1-specific T-cell receptorRagweed major allergen-specific T-cell receptorAmb a 1-reactive TCRShort ragweed allergen-specific T-cell receptor

Allergen-specific immunotherapy (AIT) interacts with Amb a 1-specific T-cell receptors to induce peripheral T-cell tolerance, characterized by the induction of anergy, clonal deletion, or the differentiation of regulatory T-cells (Tregs) that produce suppressive cytokines like IL-10 and TGF-beta (Source: Akdis & Akdis, 2014, Journal of Allergy and Clinical Immunology).