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    Basal brain oxidative and nitrative stress levels are finely regulated by the interplay between superoxide dismutase 2 and p53

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    Date
    2015
    DOI
    10.1002/jnr.23627

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    Author
    Barone E.
    Cenini G.
    Di Domenico F.
    Noel T.
    Wang C.
    Perluigi M.
    St Clair D.K.
    Butterfield D.A.
    Abstract
    Superoxide dismutases (SODs) are the primary reactive oxygen species (ROS)-scavenging enzymes of the cell and catalyze the dismutation of superoxide radicals O2- to H2O2 and molecular oxygen (O2). Among the three forms of SOD identified, manganese-containing SOD (MnSOD, SOD2) is a homotetramer located wholly in the mitochondrial matrix. Because of the SOD2 strategic location, it represents the first mechanism of defense against the augmentation of ROS/reactive nitrogen species levels in the mitochondria for preventing further damage. This study seeks to understand the effects that the partial lack (SOD2-/+) or the overexpression (TgSOD2) of MnSOD produces on oxidative/nitrative stress basal levels in different brain isolated cellular fractions (i.e., mitochondrial, nuclear, cytosolic) as well as in the whole-brain homogenate. Furthermore, because of the known interaction between SOD2 and p53 protein, this study seeks to clarify the impact that the double mutation has on oxidative/nitrative stress levels in the brain of mice carrying the double mutation (p53-/- × SOD2-/+ and p53-/- × TgSOD2). We show that each mutation affects mitochondrial, nuclear, and cytosolic oxidative/nitrative stress basal levels differently, but, overall, no change or reduction of oxidative/nitrative stress levels was found in the whole-brain homogenate. The analysis of well-known antioxidant systems such as thioredoxin-1 and Nrf2/HO-1/BVR-A suggests their potential role in the maintenance of the cellular redox homeostasis in the presence of changes of SOD2 and/or p53 protein levels. © 2015 Wiley Periodicals, Inc.
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    LA UNIVERSIDAD
    • Aseguramiento de Calidad
    • Internacional
    • Vinculación con el Medio
    • Más Transparencia
    • Acreditación
    • Reglamentos e instructivos
    • Reclamos y Sugerencias
    FACULTADES
    • Administración y Negocios
    • Arquitectura y Construcción
    • Ciencias de la Salud
    • Ciencias Sociales y Humanidades
    • Derecho
    • Educación
    • Ingeniería
    INVESTIGACIÓN
    • Estructura
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    • Institutos de Investigación
    • Centros de Investigación
    • Grupos de Investigación
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    • Postgrados
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