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Weizer-Stern, Orly; Adamsky, Konstantin; Amariglio, Ninette; Rachmilewitz, Eliezer; Breda, Laura; Rivella, Stefano; Rechavi, Gideon
American journal of hematology, 01/2006, Letnik: 81, Številka: 7Journal Article
beta-Thalassemia is an inherited anemia in which synthesis of the hemoglobin beta-chain is decreased. The excess unmatched alpha-globin chains accumulate in the growing erythroid precursors, causing their premature death (ineffective erythropoiesis). Clinical features of beta-thalassemia include variably severe anemia and iron accumulation due to increased intestinal iron absorption. The most anemic patients require regular blood transfusions, which exacerbate their iron overload and result in damage to vital organs. The hepatic peptide hepcidin, a key regulator of iron metabolism in mammals, was recently found to be low in the urine of beta-thalassemia patients, compared with healthy controls, despite their iron overload. In our work, we measured by RQ- PCR the liver mRNA expression of hepcidin and other iron regulatory genes in beta-thalassemia major mouse model (C57Bl/6 Hbb super(th3/th3)), and compared it with beta-thalassemia intermedia mouse model (C57Bl/6 Hbb super(th3/+)) and control mice. We found decreased expression of hepcidin and TfR2 and increased expression of TfR1 and NGAL in the beta-thalassemia mouse models, compared with the control mice. Significant down-regulation of hepcidin expression in beta-thalassemia major, despite iron overload, might explain the increased iron absorption typically observed in thalassemia. Am. J. Hematol. 81:479-483, 2006.
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