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• W2155294524 endingPage "1931" @default.
• W2155294524 startingPage "1919" @default.
• W2155294524 abstract "ABSTRACT Transferrin receptor (TfR1) and divalent metal transporter 1 (DMT1) are important proteins for cellular iron uptake, and both are regulated transcriptionally through the binding of hypoxia‐inducible factor 1 (HIF‐1) to hypoxia‐responsive elements (HREs) under hypoxic conditions. These proteins are also regulated post‐transcriptionally through the binding of iron regulatory protein 1 (IRP1) to iron‐responsive elements (IREs) located in the mRNA untranslated region (UTR) to control cellular iron homeostasis. In iron‐deficient cells, IRP1–IRE interactions stabilize TfR1 and DMT1 mRNAs, enhancing iron uptake. However, little is known about the impact of IRP1 on the regulation of cellular iron homeostasis under hypoxia. Thus, to investigate the role of IRP1 in hypoxic condition, overexpression and knockdown assays were performed using HepG2 cells. The overexpression of IRP1 suppressed the hypoxia‐induced increase in TfR1 and DMT1 (+IRE) expression and reduced the stability of TfR1 and DMT1 (+IRE) mRNAs under hypoxia, whereas IRP1 knockdown further increased the hypoxia‐induced expression of both proteins, preventing the decrease in IRE‐dependent luciferase activity induced by hypoxia. Under hypoxic conditions, ferrous iron uptake, the labile iron pool (LIP), and total intracellular iron reduced when IRP1 was overexpressed and further increased when IRP1 was knocked down. IRP1 expression declined and TfR1/DMT1 (+IRE) expression increased with the time of hypoxia prolonged, whereas the binding of IRP1 to the IRE of TfR1/DMT1 mRNA maintained. In summary, IRP1 suppressed TfR1/DMT1 (+IRE) expression, limited the cellular iron content and decreased lactate dehydrogenase (LDH) release induced by hypoxia. J. Cell. Biochem. 116: 1919–1931, 2015. © 2015 Wiley Periodicals, Inc." @default.
• W2155294524 created "2016-06-24" @default.
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• W2155294524 date "2015-07-23" @default.
• W2155294524 modified "2023-10-05" @default.
• W2155294524 title "Iron Regulatory Protein 1 Suppresses Hypoxia-Induced Iron Uptake Proteins Expression and Decreases Iron Levels in HepG2 Cells" @default.
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• W2155294524 doi "https://doi.org/10.1002/jcb.25147" @default.
• W2155294524 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25727755" @default.
• W2155294524 hasPublicationYear "2015" @default.
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