Aberrant DNA Methylation and Expression of SPDEF and FOXA2 in Airway Epithelium of Patients with COPD

Overview

Journal Clin Epigenetics

Publisher Biomed Central

Specialty Genetics

Date 2017 Apr 29

PMID 28450970

Citations 19

Authors

J Song

I H Heijink

L E M Kistemaker

M Reinders-Luinge

W Kooistra

J A Noordhoek

R Gosens

C A Brandsma

W Timens

P S Hiemstra

M G Rots

M N Hylkema

Affiliations

Soon will be listed here.

Abstract

Background: Goblet cell metaplasia, a common feature of chronic obstructive pulmonary disease (COPD), is associated with mucus hypersecretion which contributes to the morbidity and mortality among patients. Transcription factors SAM-pointed domain-containing Ets-like factor (SPDEF) and forkhead box protein A2 (FOXA2) regulate goblet cell differentiation. This study aimed to (1) investigate DNA methylation and expression of and during goblet cell differentiation and (2) compare this in airway epithelial cells from patients with COPD and controls during mucociliary differentiation.

Methods: To assess DNA methylation and expression of and during goblet cell differentiation, primary airway epithelial cells, isolated from trachea (non-COPD controls) and bronchial tissue (patients with COPD), were differentiated by culture at the air-liquid interface (ALI) in the presence of cytokine interleukin (IL)-13 to promote goblet cell differentiation.

Results: We found that expression was induced during goblet cell differentiation, while expression was decreased. Importantly, CpG number 8 in the promoter was hypermethylated upon differentiation, whereas DNA methylation of promoter was not changed. In the absence of IL-13, COPD-derived ALI-cultured cells displayed higher expression than control-derived ALI cultures, whereas no difference was found for expression. This was accompanied with hypomethylation of CpG number 6 in the promoter and also hypomethylation of CpG numbers 10 and 11 in the promoter.

Conclusions: These findings suggest that aberrant DNA methylation of and is one of the factors underlying mucus hypersecretion in COPD, opening new avenues for epigenetic-based inhibition of mucus hypersecretion.

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