Glucocorticoid-regulated Genes in Eosinophilic Esophagitis: a Role for FKBP51

Overview

Journal J Allergy Clin Immunol

Specialty Allergy & Immunology

Date 2010 Apr 8

PMID 20371398

Citations 40

Authors

Julie M Caldwell

Carine Blanchard

Margaret H Collins

Philip E Putnam

Ajay Kaul

Seema S Aceves

Catherine A Bouska

Marc E Rothenberg

Affiliations

Soon will be listed here.

Abstract

Background: Eosinophilic esophagitis (EE) involves marked accumulation of eosinophils in the esophageal mucosa that responds to swallowed fluticasone propionate (FP) in a subset of patients.

Objectives: We aimed to uncover the mechanism of action of swallowed FP in patients with EE by providing evidence for a topical effect in the esophagus by identifying a molecular signature for FP exposure in vivo.

Methods: Global microarray expression profiles, immunofluorescence microscopy, and cell signaling in esophageal tissue and cell lines were analyzed.

Results: Thirty-two transcripts exhibited altered expression in patients who responded to swallowed FP treatment. Esophageal FK506-binding protein 5 (FKBP51) mRNA levels were increased (P < .05) in FP responders compared with those seen in control subjects and patients with untreated active EE. After FP treatment of esophageal epithelial cells, FKBP51 mRNA and protein levels were increased in a dose- and time-dependent manner by FP treatment in vitro. FP-induced FKBP51 was steroid receptor dependent because RU486 completely inhibited gene and protein induction. The half-life of FKBP51 mRNA was 16 to 18 hours independent of FP treatment. FKBP51 overexpression reduced FP action as assessed by FP inhibition of IL-13-induced eotaxin-3 promoter activity.

Conclusions: Our results suggest that swallowed glucocorticoid treatment directly affects esophageal gene expression in patients with EE. In particular, increased FKBP51 transcript levels identify glucocorticoid exposure in vivo and distinguish FP responders from untreated patients with active EE and patients without EE. In addition, FKBP51 reduces glucocorticoid-mediated inhibition of IL-13 signaling in epithelial cells in vitro, suggesting that FKBP51 might influence FP responsiveness. We propose that esophageal FKBP51 levels have diagnostic and prognostic significance in patients with EE.

Citing Articles

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