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• W2024687032 abstract "<h3>Objective</h3> As a major cellular defence mechanism, the Nrf2/Keap1 pathway regulates expression of genes involved in detoxification and stress response. Here we hypothesise that Nrf2 is involved in oesophageal barrier function and plays a protective role against gastro-oesophageal reflux disease (GERD). <h3>Design</h3> Human oesophageal biopsy samples, mouse surgical models and Nrf2^−/− mice were used to assess the role of the Nrf2/Keap1 pathway in oesophageal barrier function. Trans-epithelial electrical resistance (TEER) was measured with mini-Ussing chambers. HE staining and transmission electron microscopy were used to examine tissue morphology, while gene microarray, immunohistochemistry, western blotting and chromatin immunoprecipitation (ChIP) analysis were used to assess gene expression. <h3>Results</h3> Nrf2 was expressed in normal oesophageal epithelium and activated in GERD of both humans and mice. Nrf2 deficiency and gastro-oesophageal reflux in mice, alone or in combination, reduced TEER and increased intercellular space in oesophageal epithelium. Nrf2 target genes and gene sets associated with oxidoreductase activity, mitochondrial biogenesis and energy production were downregulated in the oesophageal epithelium of Nrf2^−/− mice. Consistent with the antioxidative function of Nrf2, a DNA oxidative damage marker (8OHdG) dramatically increased in oesophageal epithelial cells of Nrf2^−/− mice compared with those of wild-type mice. Interestingly, ATP biogenesis, Cox IV (a mitochondrial protein) and Claudin 4 (Cldn4) expression were downregulated in the oesophageal epithelium of Nrf2^−/− mice, suggesting that energy-dependent tight junction integrity was subject to Nrf2 regulation. ChIP analysis confirmed the binding of Nrf2 to Cldn4 promoter. <h3>Conclusions</h3> Nrf2 deficiency impairs oesophageal barrier function through disrupting energy-dependent tight junction." @default.
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• W2024687032 date "2013-05-15" @default.
• W2024687032 modified "2023-10-18" @default.
• W2024687032 title "Nrf2 deficiency impairs the barrier function of mouse oesophageal epithelium" @default.
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• W2024687032 doi "https://doi.org/10.1136/gutjnl-2012-303731" @default.
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