1. TRAIL deficiency and PP2A activation with salmeterol ameliorates egg allergen-driven eosinophilic esophagitis.
- Author
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Sokulsky LA, Collison AM, Nightingale S, Fevre AL, Percival E, Starkey MR, Hansbro PM, Foster PS, and Mattes J
- Subjects
- Animals, Anti-Inflammatory Agents administration & dosage, Anti-Inflammatory Agents therapeutic use, Bronchodilator Agents administration & dosage, Case-Control Studies, Chemokine CCL11 genetics, Chemokine CCL11 metabolism, Child, Cytokines genetics, Cytokines metabolism, Dexamethasone administration & dosage, Dexamethasone therapeutic use, Eosinophilic Esophagitis drug therapy, Eosinophilic Esophagitis etiology, Eosinophilic Esophagitis pathology, Female, Fibrosis, Humans, Interleukin-3 genetics, Interleukin-3 metabolism, Interleukin-5 genetics, Interleukin-5 metabolism, Male, Mice, Mice, Inbred BALB C, Microtubule Proteins metabolism, Nuclear Proteins metabolism, Ovalbumin adverse effects, Salmeterol Xinafoate administration & dosage, TNF-Related Apoptosis-Inducing Ligand deficiency, TNF-Related Apoptosis-Inducing Ligand metabolism, Transcription Factors metabolism, Ubiquitin-Protein Ligases, Thymic Stromal Lymphopoietin, Bronchodilator Agents therapeutic use, Egg Hypersensitivity complications, Eosinophilic Esophagitis metabolism, Protein Phosphatase 2 metabolism, Salmeterol Xinafoate therapeutic use, TNF-Related Apoptosis-Inducing Ligand genetics
- Abstract
Food antigens are common inflammatory triggers in pediatric eosinophilic esophagitis (EoE). TNF-related apoptosis-inducing ligand (TRAIL) promotes eosinophilic inflammation through the upregulation of the E3 ubiquitin ligase Midline (MID)-1 and subsequent downregulation of protein phosphatase 2A (PP2A), but the role of this pathway in EoE that is experimentally induced by repeated food antigen challenges has not been investigated. Esophageal mucosal biopsies were collected from children with EoE and controls and assessed for TRAIL and MID-1 protein and mRNA transcript levels. Wild-type and TRAIL-deficient (Tnfsf10
-/- ) mice were administered subcutaneous ovalbumin (OVA) followed by oral OVA challenges. In separate experiments, OVA-challenged mice were intraperitoneally administered salmeterol or dexamethasone. Esophageal biopsies from children with EoE revealed increased levels of TRAIL and MID-1 and reduced PP2A activation compared with controls. Tnfsf10-/- mice were largely protected from esophageal fibrosis, eosinophilic inflammation, and the upregulation of TSLP, IL-5, IL-13, and CCL11 when compared with wild-type mice. Salmeterol administration to wild-type mice with experimental EoE restored PP2A activity and also prevented esophageal eosinophilia, inflammatory cytokine expression, and remodeling, which was comparable to the treatment effect of dexamethasone. TRAIL and PP2A regulate inflammation and fibrosis in experimental EoE, which can be therapeutically modulated by salmeterol., (Copyright © 2016 the American Physiological Society.)- Published
- 2016
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