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- W2005367036 abstract "Hyperglycemia increases insulin flux through the endoplasmic reticulum (ER) of pancreatic β-cells, and the unfolded protein response pathway is required to enhance insulin processing. Pancreatic and duodenal homeobox 1 (PDX1), a key pancreatic transcription factor, regulates insulin along with targets involved in insulin processing and secretion. Here we find that PDX1 is a direct transcriptional regulator of ER oxidoreductin-1-like β (Ero1lβ), which maintains the oxidative environment of the ER to facilitate disulfide bond formation. PDX1 deficiency reduced Ero1lβ transcript levels in mouse islets and mouse insulinoma (MIN6) cells; moreover, PDX1 occupied the Ero1lβ promoter in β-cells. ERO1lβ levels were induced by high glucose concentrations and by the reducing agent dithiothreitol, indicating potential roles in adaptation to increased oxidative protein folding load in the β-cell ER. In MIN6 cells, small interfering RNA-mediated silencing of Ero1lβ decreased insulin content and increased susceptibility to ER stress-induced apoptosis. These findings demonstrate roles for the PDX1 target ERO1lβ in maintaining insulin content and regulating cell survival during ER stress." @default.
- W2005367036 created "2016-06-24" @default.
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- W2005367036 date "2011-05-03" @default.
- W2005367036 modified "2023-09-27" @default.
- W2005367036 title "Endoplasmic Reticulum Oxidoreductin-1-Like β (ERO1lβ) Regulates Susceptibility to Endoplasmic Reticulum Stress and Is Induced by Insulin Flux in β-Cells" @default.
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- W2005367036 doi "https://doi.org/10.1210/en.2010-1420" @default.
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