| Popis: |
Background: Interleukin (IL)-18 is emerging as an attractive participant in allergic rhinitis (AR). However, correlation of IL-18 with IL-18 binding protein (BP) in plasma, and expression of IL-18, IL-18BP and IL-18 receptor (R) in AR blood monocytes remain obscure. We therefore investigated IL-18, IL-18BP and IL-18R expression in monocytes using flow cytometric analysis, murine AR model, and quantitative real-time PCR in the present study. Results: Plasma IL-18 and IL-1β in AR patients was higher than those in healthy control subjects. Free (f)IL-18 had a high correlation with IL-18BP, IL-1β and TNF-α in AR plasma. Proportion of IL-18+ monocytes was increased, whereas IL-18BP+ monocytes were decreased in blood of patients with AR. It was found that Platanus pollen allergen extract provoked the elevated expression of IL-18 and IL-18R in AR blood monocytes. Dermatophagoides pteronyssinus, Artemisia sieversiana wild and Platanus pollen allergen extracts enhanced IL-18R protein and mRNA expression in isolated primary monocytes from AR patients. Moreover, numbers of macrophages and IL-18R+ macrophages in nasal lavage fluid (NLF) were increased, and levels of IL-18 in both plasma and NLF were elevated in AR mice. Conclusions: These suggest that IL-18 is likely to participate in the development of AR as a causative factor; therefore, it could be a therapeutic target for AR. |
