Peanut allergen-specific T cell receptor (Peanut-specific TCR)

Peanut allergen-specific T cell receptors (TCRs) are specialized heterodimeric surface proteins found on T lymphocytes that mediate the recognition of specific peanut protein fragments, primarily from the Ara h 1, Ara h 2, and Ara h 3 allergens. These receptors bind to allergen-derived peptides presented by Major Histocompatibility Complex (MHC) class II molecules on the surface of antigen-presenting cells. In allergic individuals, this recognition event triggers a Th2-polarized immune response, characterized by the production of cytokines such as IL-4, IL-5, and IL-13, which facilitate IgE class-switching in B cells and subsequent mast cell sensitization [1][4]. As a therapeutic target, these TCRs are central to the mechanism of allergen-specific immunotherapy, which seeks to modify the T cell response from a pro-allergic Th2 phenotype to a tolerant or regulatory phenotype. Drugs like Palforzia utilize the natural ligands of these receptors to induce desensitization, while adjunct biologics like Omalizumab or Dupilumab modulate the downstream allergic cascade initiated by TCR activation [2][3]. Recent advancements in TCR sequencing and T cell engineering are exploring the use of these receptors as biomarkers for treatment efficacy and as components of TCR-engineered regulatory T cell therapies designed to provide long-lasting protection against anaphylaxis [4].

Other names

Peanut-reactive T cell receptorAra h-specific T cell receptorPeanut-specific TCRAllergen-specific T cell receptor

Peanut allergen-specific T cell receptors recognize peptide epitopes from peanut proteins (e.g., Ara h 1, Ara h 2, Ara h 3) presented by MHC Class II molecules on antigen-presenting cells. Therapeutic interventions like oral immunotherapy (OIT) aim to induce desensitization or immunological tolerance by repeatedly stimulating these receptors with controlled doses of the allergen, leading to T cell anergy, deletion, or the induction of regulatory T cells (Tregs) [1][2].