Abstract
BackgroundMugwort and house dust mite (HDM) are two of the most common inhalant allergens in Asia, however, whether mugwort affects polysensitized HDM+ allergic rhinitis (AR) patients has not been elucidated.MethodsOverall, 15,884 AR outpatients were assessed for clinical status. Amino acid sequences of mugwort were determined by mass spectrometry. Afterward, cross-reactivity between mugwort tropomyosin and Dermatophagoides pteronyssinus 10 (Der p10) was analysed by ELISA inhibition and basophil activation experiments. To compare immunologic responses eliciting by two different tropomyosins, peripheral blood mononuclear cells (PBMCs) of HDM-monosensitized patients were stimulated by mugwort, HDM, Der p10 and synthetic peptides representing mugwort tropomyosin respectively.ResultsPolysensitized HDM+AR patients were mainly sensitized to cat and mugwort, and the positive rate of monosensitized HDM+AR out-clinic patients was increased during the mugwort pollen season. Tropomyosin protein was able to find in mugwort. Synthetic tropomyosin peptide of mugwort activated basophils which were primed by HDM-specific IgE; ELISA inhibition experiment showed synthetic tropomyosin peptide of mugwort inhibited IgE binding to HDM tropomyosin, Der p10. Unlike HDM and Derp 10, mugwort and mugwort tropomyosin mainly induced IFN-γ and IL-17 release in PBMCs of monosensitized HDM+AR patients, but not IL-5.ConclusionsPan-allergen tropomyosin accounts for the cross-reactivity between mugwort and HDM, which reminds HDM+ patients to reduce mugwort exposure in mugwort pollen season in virtue of the tropomyosin induced mild inflammation.
Highlights
Allergic rhinitis (AR), an upper airway allergic inflammatory disease, causes symptoms of sneeze, runny nose, nasal obstruction and itchy nose, which is predominantly mediated by type 2 helper (Th2) cells and immunoglobulin E (IgE) [1, 2]
Pan-allergen tropomyosin accounts for the cross-reactivity between mugwort and house dust mite (HDM), which reminds HDM+ patients to reduce mugwort exposure in mugwort pollen season in virtue of the tropomyosin induced mild inflammation
Regardless of the level of HDM-specific IgE detected, sensitization was greatest to inhalant allergens in the polysensitized HDM+allergic rhinitis (AR) patients (Fig. 1a)
Summary
Allergic rhinitis (AR), an upper airway allergic inflammatory disease, causes symptoms of sneeze, runny nose, nasal obstruction and itchy nose, which is predominantly mediated by type 2 helper (Th2) cells and immunoglobulin E (IgE) [1, 2]. The treatments for polysensitized AR patients closely associate with asthma management [7]. There are intercontinental differences in allergen products available for AIT in polysensitized patients [8]. Differences in therapeutic effects of single AIT have been shown, in which more effective in reducing the symptoms are observed in those of monosensitized patients than that of polysensitized patients treated with the same dose [11, 12]. There are no obvious change in HDM-specific IgE production and a lower concentration of HDM-specific IgG4 in polysensitized patients compared with those of monosensitized patients after AIT [12, 13]. Mugwort and house dust mite (HDM) are two of the most common inhalant allergens in Asia, whether mugwort affects polysensitized HDM+ allergic rhinitis (AR) patients has not been elucidated
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