T-cell receptor recognizing Amb a 1-derived epitopes (TCR-Amb a 1)

T-cell receptors (TCRs) recognizing Amb a 1-derived epitopes are specialized protein complexes on the surface of CD4+ T lymphocytes that mediate the adaptive immune response to short ragweed (Ambrosia artemisiifolia) pollen. These receptors specifically recognize peptide fragments of Amb a 1, a 38 kDa pectate lyase and the primary allergen in ragweed, when presented by Major Histocompatibility Complex (MHC) class II molecules (Wopfner et al., 2005). In sensitized individuals, the activation of these TCRs drives a Th2-biased immune response, resulting in the production of cytokines like IL-4 and IL-13, which stimulate IgE production and allergic inflammation (Jahn-Schmid et al., 2010). These TCRs are the primary targets of allergen-specific immunotherapy (AIT), which aims to reprogram the immune system toward tolerance through desensitization, T-cell anergy, or the induction of regulatory T cells (Tregs) (Akdis & Akdis, 2014). Therapeutic agents such as Ragwitek and various ragweed extracts interact with these receptors to modify the disease course, though they carry risks of systemic allergic reactions and anaphylaxis.

Other names

Amb a 1-specific T-cell receptorRagweed allergen-specific T-cell receptorShort ragweed pollen allergen Amb a 1-specific TCR

Allergen-specific immunotherapy (AIT) modulates these receptors by inducing peripheral T-cell tolerance, shifting the immune response from a Th2 to a Th1 or regulatory T-cell (Treg) profile, and promoting the production of blocking antibodies such as IgG4.