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Co-Stimulation with TWEAK and TGF-β1 Induces Steroid-Insensitive TSLP and CCL5 Production in BEAS-2B Human Bronchial Epithelial Cells

Abstract

Steroid-resistant asthma is a common cause of refractory asthma. Type 2 inflammation is the main inflammatory response in asthma, and the mechanism underlying the steroid-resistance of type 2 inflammation has not been completely elucidated. Tumor-necrosis-factor-like apoptosis-inducing factor (TWEAK) and transforming growth factor (TGF)-β1 are involved in epithelial-mesenchymal transition (EMT) and the production of thymic stromal lymphopoietin (TSLP) and C-C motif chemokine ligand 5 (CCL5). We herein hypothesize that the combined exposure to TWEAK and TGF-β1 may result in the development of steroid resistance in bronchial epithelial cells. The bronchial epithelial cell line BEAS-2B was cultured with or without TGF-β1 or TWEAK, in the presence or absence of dexamethasone (DEX). The roles of Smad-independent pathways and MAP kinase phosphatase 1 (MKP-1) were also explored. Co-stimulation of TWEAK and TGF-β1 induced E-cadherin reduction, N-cadherin upregulation, and TSLP and CCL5 production, which were not suppressed by DEX. Inhibition of the nuclear factor kappa beta (NF-κB) and mitogen-activated protein kinase pathways downregulated steroid-unresponsive TSLP and CCL5 production, whereas knockdown of MKP-1 improved steroid-unresponsive TSLP production, induced by co-stimulation with TWEAK and TGF-β1. Therefore, co-stimulation with TWEAK and TGF-β1 can induce the steroid-insensitive production of TSLP and CCL5 in the bronchial epithelium and may contribute to airway inflammation.

References
1.
Soumelis V, Reche P, Kanzler H, Yuan W, Edward G, Homey B . Human epithelial cells trigger dendritic cell mediated allergic inflammation by producing TSLP. Nat Immunol. 2002; 3(7):673-80. DOI: 10.1038/ni805. View

2.
Barnes P . Glucocorticosteroids: current and future directions. Br J Pharmacol. 2011; 163(1):29-43. PMC: 3085866. DOI: 10.1111/j.1476-5381.2010.01199.x. View

3.
Kim S, Kim J, Sol I, Kim M, Kim M, Hong J . Sputum TWEAK expression correlates with severity and degree of control in non-eosinophilic childhood asthma. Pediatr Allergy Immunol. 2017; 29(1):42-49. DOI: 10.1111/pai.12827. View

4.
Itoigawa Y, Harada N, Harada S, Katsura Y, Makino F, Ito J . TWEAK enhances TGF-β-induced epithelial-mesenchymal transition in human bronchial epithelial cells. Respir Res. 2015; 16:48. PMC: 4397832. DOI: 10.1186/s12931-015-0207-5. View

5.
Ayroldi E, Riccardi C . Glucocorticoid-induced leucine zipper (GILZ): a new important mediator of glucocorticoid action. FASEB J. 2009; 23(11):3649-58. DOI: 10.1096/fj.09-134684. View