Tetanus and diphtheria toxoid-specific B-cell receptor (TT/DT-specific BCR)

Antigen-specific B-cell receptors (BCRs) recognizing tetanus and diphtheria toxoid epitopes are membrane-bound immunoglobulin complexes found on the surface of specific B lymphocyte subsets (Janeway's Immunobiology, 2017). These receptors are composed of an antigen-binding subunit (membrane-bound IgM, IgD, IgG, or IgA) and a signaling subunit consisting of CD79A and CD79B heterodimers (UniProt, P11912). Their primary biological function is the recognition of epitopes on tetanus toxoid (TT) and diphtheria toxoid (DT), which are inactivated forms of the toxins produced by Clostridium tetani and Corynebacterium diphtheriae, respectively (StatPearls, NBK545284). Upon antigen binding, these BCRs initiate signal transduction pathways that lead to B-cell activation, clonal expansion, and the generation of high-affinity memory B cells and antibody-secreting plasma cells (PubMed, PMID: 30107248). This process is the fundamental mechanism by which Tdap and DTaP vaccines confer long-term protective immunity against tetanus and diphtheria (CDC, 2023). In clinical and research settings, these BCRs are targeted by toxoid-based vaccines to elicit a protective immune response, and their frequency is often used as a biomarker for vaccine immunogenicity and the longevity of immunological memory (PubMed, PMID: 21148615).

Other names

Anti-tetanus toxoid B-cell receptorAnti-diphtheria toxoid B-cell receptorTT-specific BCRDT-specific BCRTetanus-specific B-cell receptorDiphtheria-specific B-cell receptor

Antigen binding to the B-cell receptor induces receptor clustering and activation of intracellular signaling pathways (e.g., via CD79A and CD79B), leading to B-cell differentiation into memory B cells and plasma cells that secrete neutralizing antibodies (Janeway's Immunobiology, 2017; UniProt, P11912).