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• W2019950427 abstract "The pathogenesis of diabetes associated with hemochromatosis is not known. We therefore examined glucose homeostasis and beta-cell function in mouse models of hemochromatosis. Mice with targeted deletion of the hemochromatosis gene (Hfe(-/-)) on the 129/Sv genetic background exhibited a 72% increase in iron content in the islets of Langerhans compared with wild-type controls. Insulin content was decreased in Hfe(-/-) mice by 35%/pancreas and 25%/islet. Comparable decreases were seen in the mRNA levels of beta-cell-specific markers, ins1, ins2, and glucose transporter 2. By 6-8 months, islets from Hfe(-/-) mice were 45% smaller, associated with increased staining for activated caspase 3 and terminal deoxynucleotidyl transferase-mediated deoxy-UTP nick end labeling. Islets from Hfe(-/-) mice were also desensitized to glucose, with half-maximal stimulation of insulin secretion seen at 16.7 +/- 0.9 mm glucose in perifused islets from Hfe(-/-) mice compared with 13.1 +/- 0.6 mm glucose in wild-type animals. Carbonyl protein modification, a marker for oxidative stress, was increased by 58% in Hfe(-/-) islets. Despite decreased islet size, Hfe(-/-) mice exhibited enhanced glucose tolerance. Fasting serum insulin levels were comparable between Hfe(-/-) and Hfe(+/+) mice, but were 48% lower in the Hfe(-/-) mice 30 min after challenge. Similar results were seen in mice carrying an Hfe mutation analogous to the common human mutation (C282Y) and in mice fed excess dietary iron. Hfe(-/-)mice on the C57BL6 background exhibited decreased glucose tolerance at 10-12 months due to an inability to increase insulin levels as they aged. We conclude that iron excess results in beta-cell oxidant stress and decreased insulin secretory capacity secondary to beta-cell apoptosis and desensitization of glucose-induced insulin secretion. This abnormality alone, however, is insufficient to cause diabetes." @default.
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• W2019950427 date "2004-11-01" @default.
• W2019950427 modified "2023-10-10" @default.
• W2019950427 title "Oxidative Stress, β-Cell Apoptosis, and Decreased Insulin Secretory Capacity in Mouse Models of Hemochromatosis" @default.
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• W2019950427 doi "https://doi.org/10.1210/en.2004-0392" @default.
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