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Hereditary hemochromatosis: An opportunity for gene therapy Biol. Res.
EZQUER,FERNANDO; NÚÑEZ,MARCO T; ROJAS,ALEJANDRO; ASENJO,JUAN; ISRAEL,YEDY.
Levels of body iron should be tightly controlled to prevent the formation of oxygen radicals, lipoperoxidation, genotoxicity, and the production of cytotoxic cytokines, which result in damage to a number of organs. Enterocytes in the intestinal villae are involved in the apical uptake of iron from the intestinal lumen; iron is further exported from the cells into the circulation. The apical divalent metal transporter-1 (DMT1) transports ferrous iron from the lumen into the cells, while the basolateral transporter ferroportin extrudes iron from the enterocytes into the circulation. Patients with hereditary hemochromatosis display an accelerated transepithelial uptake of iron, which leads to body iron accumulation that results in cirrhosis, hepatocellular...
Tipo: Journal article Palavras-chave: Iron; Intestine; Hemochromatosis; Gene therapy; HFE; DMT1; Cirrhosis.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100014
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Antioxidant responses of cortex neurons to iron loading Biol. Res.
AGUIRRE,PABLA; MENA,NATALIA; TAPIA,VICTORIA; ROJAS,ALEJANDRO; ARREDONDO,MIGUEL; NÚÑEZ,MARCO TULIO.
Brain cells have a highly active oxidative metabolism, yet they contain only low to moderate superoxide dismutase and catalase activities. Thus, their antioxidant defenses rely mainly on cellular reduced glutathione levels. In this work, in cortical neurons we characterized viability and changes in reduced and oxidized glutathione levels in response to a protocol of iron accumulation. We found that massive death occurred after 2 days in culture with 10 mM Fe. Surviving cells developed an adaptative response that included increased synthesis of GSH and the maintenance of a glutathione-based reduction potential. These results highlight the fundamental role of glutathione homeostasis in the antioxidant response and provide novel insights into the adaptative...
Tipo: Journal article Palavras-chave: Glutathione; Iron; Redox response; Cortical neurons; Cell death.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100012
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