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• W2002132361 abstract "Epithelial-to-mesenchymal transition (EMT) induced by chronic hypoxia is one of the critical causes of renal fibrosis. Twist, a basic helix-loop-helix transcription factor, is believed to be important in promoting EMT. We found that the expression of Twist was increased in human tubule cell lines (HK-2 and HKC) grown under hypoxic conditions. This was accompanied by reduced expression of the epithelial markers E-cadherin and ZO-1 and enhanced expression of the mesenchymal markers vimentin and alpha-smooth muscle actin. When Twist was overexpressed in these cells it induced a mesenchymal phenotype, whereas its knockdown by short interfering RNA (siRNA) effectively reversed hypoxia-induced EMT. We showed that transfection with siRNA to hypoxia-inducible factor-1alpha (HIF-1alpha), another basic helix-loop-helix transcription factor, reduced Twist expression. Twist promoters contain HIF1-alpha-binding sites and transfection of reporter constructs using the promoter showed increased transcription in cells subjected to hypoxia. Electrophoretic mobility shift and chromatin immunoprecipitation assays identified the presence of a functional HIF-1alpha-binding site within the proximal Twist gene promoter. In an in vivo assay using the rat remnant kidney we found that both Twist and HIF-1alpha were overexpressed in tubular epithelial cells showing EMT. These studies suggest that HIF-1alpha induces Twist expression in hypoxic tubular cells and that this plays a role in EMT during renal fibrogenesis." @default.
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• W2002132361 date "2009-06-01" @default.
• W2002132361 modified "2023-10-13" @default.
• W2002132361 title "Hypoxia-inducible factor-1α induces Twist expression in tubular epithelial cells subjected to hypoxia, leading to epithelial-to-mesenchymal transition" @default.
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• W2002132361 doi "https://doi.org/10.1038/ki.2009.62" @default.
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