Dermatophagoides-derived peptides bound to Human Leukocyte Antigen (HLA) class II (HDM-pMHCII complex)

Dermatophagoides-derived peptides bound to HLA class II molecules on antigen-presenting cells (APCs) constitute the fundamental molecular complex responsible for initiating and maintaining allergic responses to house dust mites (HDM) (Galli et al., Nature, 2008). Major allergens from species like Dermatophagoides pteronyssinus (Der p) and Dermatophagoides farinae (Der f) are internalized by APCs, such as dendritic cells, and processed into immunogenic peptides. These peptides are then displayed on the cell surface within the peptide-binding groove of Human Leukocyte Antigen (HLA) class II molecules, specifically HLA-DR, HLA-DQ, or HLA-DP (Hales et al., J Allergy Clin Immunol, 2006). Recognition of these pMHCII complexes by the T-cell receptors (TCRs) of allergen-specific CD4+ T cells triggers a Th2-polarized immune response, leading to IgE production, eosinophil recruitment, and airway hyperresponsiveness. This complex is the primary target of allergen-specific immunotherapy (AIT), which seeks to reprogram the immune system toward tolerance by inducing regulatory T cells (Tregs) and IgG4-producing B cells (Akdis & Akdis, Nature Reviews Drug Discovery, 2009). Understanding the specific peptide-HLA combinations is crucial for developing next-generation precision medicines, such as peptide-based vaccines and TCR-like therapeutics, which aim to treat allergic asthma and rhinitis with improved safety profiles compared to traditional extracts.

Other names

House dust mite allergen-MHC II complexHDM-pMHCIIDer p peptide-HLA II complexDer f peptide-HLA II complexMite allergen-peptide-MHC class II complex

Induction of immunological tolerance through the modulation of CD4+ T-cell responses to allergen-derived peptides presented by MHC class II molecules, resulting in regulatory T-cell (Treg) expansion and a shift from Th2 to Th1/IgG4 immune profiles (Akdis & Akdis, Nature Reviews Drug Discovery, 2009).