Sputum microRNA-screening reveals Prostaglandin EP3 receptor as selective target in allergen-specific immunotherapy.

Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology 2021 Dec

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Several microRNAs (miRs) have been described as potential biomarkers in liquid biopsies and in the context of allergic asthma, while therapeutic effects on the airway expression of miRs remain elusive. In this study, we investigated epigenetic miR-associated mechanisms in the sputum of grass pollen-allergic patients with and without allergen-specific immunotherapy (AIT). Induced sputum samples of healthy controls (HC), AIT-treated and -untreated grass pollen-allergic rhinitis patients with (AA) and without asthma (AR) were profiled using miR microarray and whole-transcriptome microarray analysis of the same samples. miR targets were predicted in silico and used to identify inverse regulation. Local PGE2 levels were measured using ELISA. Two hundred and fifty nine miRs were upregulated in the sputum of AA patients compared with HC, while only one was downregulated. The inverse picture was observed in induced sputum of AIT-treated patients: while 21 miRs were downregulated, only 4 miRs were upregulated in asthmatics upon AIT. Of these 4 miRs, miR-3935 stood out, as its predicted target PTGER3, the prostaglandin EP3 rece ptor, was downregulated in treated AA patients compared with untreated. The levels of its ligand PGE2 in the sputum supernatants of these samples were increased in allergic patients, especially asthmatics, and downregulated after AIT. Finally, local PGE2 levels correlated with ILC2 frequencies, secreted sputum IL-13 levels, inflammatory cell load, sputum eosinophils and symptom burden. While profiling the sputum of allergic patients for novel miR expression patterns, we uncovered an association between miR-3935 and its predicted target gene, the prostaglandin E3 receptor, which might mediate AIT effects through suppression of the PGE2 -PTGER3 axis. © 2021 The Authors. Clinical & Experimental Allergy published by John Wiley & Sons Ltd.

Citation

Constanze A Jakwerth, Adam M Chaker, Ferdinand Guerth, Madlen Oelsner, Lisa Pechtold, Lynn S Zur Bonsen, Julia T Ullmann, Susanne Krauss-Etschmann, Anna Erb, Josephine Kau, Mirjam Plaschke, Marlene Winkler, Alexandra Kurz, Antonia Kloss, Julia Esser-von Bieren, Carsten B Schmidt-Weber, Ulrich M Zissler. Sputum microRNA-screening reveals Prostaglandin EP3 receptor as selective target in allergen-specific immunotherapy. Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology. 2021 Dec;51(12):1577-1591