Artículo
Effects of acute iron overload on Nrf2-related glutathione metabolism in rat brain
Piloni, Natacha Estefanía
; Vargas, Romina; Fernández, Virginia; Videla, Luis A.; Puntarulo, Susana Ángela
Fecha de publicación:
10/2021
Editorial:
Springer
Revista:
Biometals
ISSN:
0966-0844
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Iron (Fe) overload triggers free radical production and lipid peroxidation processes that may lead to cell death (ferroptosis). The hypothesis of this work was that acute Fe-dextran treatment triggers Nrf2-mediated antioxidant regulation in rat brain involving glutathione (GSH) metabolism. Over the initial 8 h after Fe-dextran administration (single dose of 500 mg Fe-dextran/kg), total Fe, malondialdehyde (MDA) content, glutathione peroxidase (GPx), GPx-Se dependent (GPx-Se) and glutathione S-transferases (GST) activities were increased in rat whole brain. The content of GSH and the activity of glutathione reductase (GR) showed decreases (p < 0.05) after 6 and 8 h post injection in cortex. A significant increase in nuclear Nrf2 protein levels over control values was achieved after 6 h of Fe-dextran administration, while no significant differences were observed in the cytosolic fraction. Nuclear Nrf2/cytosolic Nrf2 ratios showed enhancement (p < 0.05) after 6 h of Fe overload, suggesting a greater translocation of the factor to the nucleus. No significant differences were observed in the expression of Keap1 in nuclear or cytosolic extracts. It is concluded that acute Fe overload induces oxidative stress in rat brain with the concomitant lipid peroxidation increase and GSH depletion, leading to the elevation of Nrf2-controlled GPx, GPx-Se and GST protein expression as a protective adaptive response. Further studies are required to fully comprehend the complex network of interrelated processes keeping the balance of GSH functions as chelator, antioxidant and redox buffer in the understanding of the ferroptotic and hormetic mechanisms triggered by Fe overload in brain.
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Articulos(IBIMOL)
Articulos de INSTITUTO DE BIOQUIMICA Y MEDICINA MOLECULAR
Articulos de INSTITUTO DE BIOQUIMICA Y MEDICINA MOLECULAR
Citación
Piloni, Natacha Estefanía; Vargas, Romina; Fernández, Virginia; Videla, Luis A.; Puntarulo, Susana Ángela; Effects of acute iron overload on Nrf2-related glutathione metabolism in rat brain; Springer; Biometals; 34; 5; 10-2021; 1017-1027
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