House dust mite allergen proteins (HDM allergens)

House dust mite (HDM) allergen proteins are a complex group of antigens derived from the fecal pellets and exoskeletons of mites, most notably Dermatophagoides pteronyssinus and Dermatophagoides farinae (Source: abinscience.com). These proteins are categorized into groups based on their biochemical properties; for instance, Group 1 allergens such as Der p 1 are cysteine proteases that increase epithelial permeability, while Group 2 allergens like Der p 2 are lipid-binding proteins that can activate innate immune pathways via TLR4 (Source: nih.gov). In sensitized individuals, these allergens trigger IgE-mediated Type I hypersensitivity, leading to chronic inflammatory diseases such as allergic rhinitis, asthma, and atopic dermatitis (Source: karger.com). Therapeutically, HDM allergen proteins are the primary targets and active components of allergen-specific immunotherapy (AIT). Drugs like Odactra and Acarizax utilize standardized HDM extracts to desensitize patients through regular, controlled exposure (Source: odactra.com). This treatment aims to modify the underlying disease by inducing peripheral T-cell tolerance, increasing the production of regulatory cytokines like IL-10, and promoting the synthesis of protective IgG4 antibodies (Source: nih.gov). While effective, AIT carries risks of local and systemic allergic reactions, including rare but severe anaphylaxis and eosinophilic esophagitis, necessitating careful patient selection and monitoring (Source: rxlist.com).

Other names

Dermatophagoides pteronyssinus allergensDermatophagoides farinae allergensHDM antigensDer p proteinsDer f proteinsAntigens Dermatophagoides

Allergen-specific immunotherapy (AIT) induces immune tolerance by shifting the immune response from a Th2-skewed profile to a Th1 and regulatory T-cell (Treg) profile (Source: e-cep.org). This process involves the induction of suppressive cytokines like IL-10 and TGF-beta, and the production of allergen-specific IgG4 "blocking" antibodies that compete with IgE for allergen binding, thereby preventing mast cell and basophil degranulation (Source: medicinenet.com).