Journal
RESPIRATORY RESEARCH
Volume 19, Issue -, Pages -Publisher
BMC
DOI: 10.1186/s12931-018-0805-0
Keywords
Chronic obstructive pulmonary disease; Cigarette smoke extract; Human antigen R; Epithelial-mesenchymal transition; Zinc finger E-box binding homeobox 1
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Funding
- Natural Science Foundation of Shandong Province [ZR2014HP052]
- National Natural Science Foundation [81300030, 81570336, 81370138, 81672858]
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Background: Increasing evidence suggests that human antigen R (HuR) is involved in the epithelial-mesenchymal transition (EMT) process of several diseases. However, the role of HuR in EMT in the airway epithelial cells of patients with COPD remains unclear. Methods: BEAS-2B cells were cultured and treated with 3% CSE. Western blotting, RT-PCR and immunofluoresence were used to detect the expression of HuR, ZEB-1. RNAi was used to suppress HuR expression. Then knockdown of HuR, RT-PCR and Western blotting showed that with siHuR-1 and siHuR-3, clear suppression of HuR expression was confirmed. We chose siHuR-3, the most effective one, to proceed with subsequent experiments. Immunofluorescence analysis, western blotting were used to detect the expression of E-cadherin, vimentin, ZEB-1 and HuR. Results: We show that more HuR expression is enhanced in the airways epithelium of smokers with or without COPD than controls (nonsmoker non-COPD patients). However, there was no definite correlation between HuR expression and FEV1%. Further study reveals that knockdown of HuR significantly increases the apoptosis of BEAS-2B cells and down-regulates ZEB-1 expression. Conclusions: EMT is partially enhanced through the HuR-binding proteins and its post-transcriptional regulation role in airway epithelium in COPD.
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