Role of IL‑15 in the modulation of TGF‑β1‑mediated inflammation in asthma

Jonakowski,Mateusz; Zioło,Jan; Koćwin,Marcelina; Przemęcka,Marcelina; Mokros,Łukasz; Panek,Michał; Szemraj,Janusz; Kuna,Piotr

doi:10.3892/etm.2017.5108

Role of IL‑15 in the modulation of TGF‑β1‑mediated inflammation in asthma

Authors:
- Mateusz Jonakowski
- Jan Zioło
- Marcelina Koćwin
- Marcelina Przemęcka
- Łukasz Mokros
- Michał Panek
- Janusz Szemraj
- Piotr Kuna
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Affiliations: Department of Internal Medicine, Asthma and Allergy, Medical University of Lodz, 90‑153 Lodz, Poland, Department of Clinical Pharmacology, Medical University of Lodz, 90‑153 Lodz, Poland, Department of Medical Biochemistry, Medical University of Lodz, 92‑215 Lodz, Poland
Published online on: September 5, 2017 https://doi.org/10.3892/etm.2017.5108
Pages: 4533-4540

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Abstract

Transforming growth factor (TGF)‑β1 has an essential role in bronchitis and the induction of bronchial remodelling, which are critical processes in the pathogenesis of asthma. However, the role of interleukin (IL)‑15 in asthma inflammation remains unclear. The aim of the present study was to evaluate the effect of TGF‑β1 mRNA expression on IL‑15 mRNA expression in asthmatic patients and to assess the role of IL‑15 in the clinical course of asthma. The study included 221 participants, comprising 130 patients with asthma and 91 healthy volunteers. The participants were subjected to testing using spirometry, as well as the Asthma Control Test™ and Borg Scale. The expression of TGF‑β1 and IL‑15 mRNA was analyzed in blood samples using reverse transcription‑quantitative polymerase chain reaction. Statistical analysis indicated that IL‑15 and TGF‑β1 mRNA expression each differed significantly between the patient and control groups (P=0.0016 and P=0.033, respectively). A significant correlation was identified between IL‑15 expression and TGF‑β1 expression (R=0.41, P=0.0005). No correlation was observed between IL‑15 expression and the degree of asthma severity, the results of spirometric examination or the frequency of asthma exacerbations. Further analysis revealed that IL‑15 expression was elevated following the administration of inhaled glucocorticosteroids (iGCs; P=0.024), and reduced following methylxanthine treatment (P<0.001). The occurrence of dyspnoea differed between the study and control groups, and this was not found to be associated with IL‑15 expression. Since IL‑15 expression was correlated with TGF‑β1 expression among asthmatic patients, and IL‑15 expression was elevated following iGC administration, the results of the study suggest that IL‑15 activity might be associated with the pathogenesis of asthma.

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