Alternaria alternata-specific B cell

Alternaria alternata-specific B cells are a specialized subset of lymphocytes that recognize allergens derived from the ubiquitous environmental mold Alternaria alternata, with the protein Alt a 1 being the primary target. In sensitized individuals, these B cells predominantly produce IgE antibodies, which mediate allergic airway diseases such as asthma and allergic rhinitis by triggering mast cell and basophil degranulation. Allergen immunotherapy (AIT) targets these B cells to shift their functional profile toward a tolerant state, characterized by the production of IgG4 blocking antibodies. These IgG4 antibodies act by intercepting allergens before they can bind to cell-bound IgE, effectively inhibiting the allergic cascade. Furthermore, the induction of regulatory B cells (Bregs) during treatment helps suppress Th2-driven inflammation, making this cellular population a focal point for achieving long-term clinical desensitization.

Other names

Alt a 1-specific B cellsAlternaria-reactive B cellsIgG4-producing B cells in mold allergy

Induction of immunoglobulin class-switching in allergen-specific B cells from IgE to IgG4, leading to the production of blocking antibodies that prevent IgE-mediated mast cell activation.