Immune system allergen recognition pathways

Immune system allergen recognition pathways refer to the collective network of pattern recognition receptors (PRRs), including Toll-like receptors (TLRs) like TLR4, C-type lectin receptors (CLRs) such as dectin-2, DC-SIGN, and mannose receptor, as well as NLRs and RLRs, that detect allergens on dendritic cells, airway epithelial cells, and other innate immune cells. These pathways enable the initial sensing of environmental allergens—proteins from sources like house dust mites (e.g., Der p 2), pollen, or fungi—through motifs mimicking pathogen-associated molecular patterns (PAMPs), such as lipids or carbohydrates, triggering downstream signaling like NF-κB activation and cytokine release. This recognition biases the immune response toward T helper 2 (Th2) polarization, promoting IgE production by B cells, eosinophil recruitment, and mast cell sensitization, which culminate in allergic inflammation. In diseases like allergic asthma and rhinitis, dysregulated pathway activation on mucosal surfaces amplifies type 2 immunity, with epithelial-derived factors like TSLP and IL-33 further sustaining the response. While not a single druggable molecule, these pathways underpin allergenicity, and their modulation is explored indirectly via biologics targeting downstream cytokines (e.g., anti-IL-4/IL-13), though direct inhibitors remain underdeveloped.

Other names

Allergen-specific pattern recognition receptor pathwaysinnate immune pathways in allergyPRR pathways for allergen recognition