Dermatophagoides pteronyssinus allergen 1 substrates (Der p 1 substrates)

Der p 1 substrates on airway epithelial and endothelial cell surfaces are a group of proteins targeted by the cysteine protease allergen Der p 1 from the house dust mite Dermatophagoides pteronyssinus. These substrates include critical junctional proteins such as Occludin, Claudin-1, Zonula occludens-1 (ZO-1), and E-cadherin, which are essential for maintaining the physical integrity of the airway barrier [Wan et al., 1999; Gough et al., 2001]. Proteolytic cleavage of these proteins by Der p 1 increases epithelial permeability, facilitating the entry of allergens and pathogens into the subepithelial space. Additionally, Der p 1 cleaves cell surface receptors like CD23 (low-affinity IgE receptor) and CD25 (IL-2 receptor alpha chain), which modulates immune signaling and promotes a Th2-biased allergic response [Schulz et al., 1998]. The allergen also activates Protease-activated receptor 2 (PAR-2), inducing the secretion of pro-inflammatory cytokines such as IL-6 and IL-8 [Asokananthan et al., 2002]. Therapeutic interventions aim to inhibit the enzymatic activity of Der p 1 using small molecule cysteine protease inhibitors, thereby protecting these substrates from degradation and preventing the initiation of allergic inflammation and asthma exacerbations.

Other names

House dust mite allergen 1 substratesHDM allergen 1 substratesDer p 1 cleavage targetsAirway epithelial junctional proteinsCD23 and CD25 receptors

Inhibition of the Der p 1 cysteine protease prevents the proteolytic cleavage and degradation of these substrates, thereby preserving airway barrier integrity and preventing pro-inflammatory signaling cascades.