Expression of TLR9 of B cells in the peripheral blood or lung tissues of patients with allergic rhinitis and allergic asthma or sensitized mice
Objective To investigate the expression of Toll-like receptor 9(TLR9)in B cells in the peripheral blood of patients with allergic rhinitis(AR),allergic asthma(AA),AR combined with AA(ARA)and the blood or lung tissue of sensitized mice,as well as the effect of allergens on its expression.Methods A total of 100 volunteers from The First Affiliated Hospital of Jinzhou Medical University were recruited for outpatient and acute inpatient attacks,consisting of 19 healthy people(HC)with negative prick test result,40 AR patients,26 AA patients,and 15 ARA patients with positive prick test result.The expression of TLR9 in the peripheral blood B cells of the patients before and after stimulation by house dust mite allergen extract(HDME),Artemisia sieversiana wild allergen extract(ASWE),and Platanus pollen allergen extract(PPE)was detected by flow cytometry.AR and AA sensitization models were established in WT mice and FcεRI-KO mice to detect the effects of allergens and FcεRI on the expression of TLR9 in B cells.Results The expression and mean fluorescence intensity(MFI)of TLR9 in peripheral blood B cells of unstimulated AR,AA and ARA patients were higher than those of HC.After allergen stimulation,the expression of TLR9 and its MFI in blood B cells of AR and AA patients increased(P＜0.05).In WT mice and FcεRI-KO mice,compared with NS control mice,MFI was increased in almost each group.Compared with the NS control group,there was no significant difference in the expression of TLR9+in B cells in the lung tissues of AA mice with FcεRI-KO after allergen challenge,but their MFI increased.FcεRI-KO mice had lower TLR9+MFI in B cells after allergen challenge compared with WT mice.Conclusion TLR9 in B cells may be involved in the occurrence of AR and AA,and detecting the expression of TLR9 in B cells may be a new direction for the diagnosis of AR and AA.
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