House dust mite-specific immunoglobulin G4 (HDM-sIgG4)

House dust mite-specific IgG4 antibodies (HDM-sIgG4) are a specialized subclass of immunoglobulins that play a critical role in the development of immunological tolerance during allergen-specific immunotherapy (AIT). These antibodies are produced by B cells in response to controlled, repeated exposure to house dust mite allergens, such as those from Dermatophagoides pteronyssinus and Dermatophagoides farinae (NIH, 2012; Karger, 2010). Their primary biological function is to act as blocking antibodies by competing with allergen-specific IgE for binding sites on the mite allergens (Frontiers in Immunology, 2020; NIH, 1987). By sequestering the allergens, HDM-sIgG4 prevents the cross-linking of IgE on the surface of mast cells and basophils, thereby inhibiting the release of inflammatory mediators like histamine and leukotrienes (Frontiers in Immunology, 2020). In clinical practice, the induction of these antibodies is used as a biomarker to monitor the immune system's response to AIT drugs like Acarizax and Odactra (NIH, 2018). Although elevated levels often correlate with clinical improvement in allergic rhinitis and asthma, they are considered a surrogate marker of the underlying shift from a Th2-mediated allergic response to a Th1/Treg-mediated tolerant state (Frontiers in Immunology, 2022; NIH, 2018).

Other names

House dust mite-specific IgG4HDM-specific IgG4Dermatophagoides pteronyssinus-specific IgG4Der p-specific IgG4Blocking antibodies

Induction of allergen-specific IgG4 antibodies that act as blocking antibodies to compete with IgE for allergen binding, thereby preventing mast cell and basophil activation.