Changes in oxidative stress parameters and neurodegeneration markers in the brain of the senescence-accelerated mice SAMP-8

Sureda, FX; Gutierrez-Cuesta, J; Romeu, M; Mulero, M; Canudas, AM; Camins, A; Mallol, J; Pallas, M

Abstract

The senescence-accelerated strains of mice (SAMP) are well-characterized animal models of senescence. Senescence may be related to enhanced production or defective control of reactive oxygen species, which lead to neuronal damage. Therefore, the activity of various oxidative-stress related enzymes was determined in the cortex of 5 months-old senescence-accelerated mice prone-8 (SAMP-8) of both sexes and compared with senescence-accelerated mice-resistant-1 (SAMR-1). Gluthatione reductase and peroxidase activities in SAMP-8 male mice were lower than in male SAMR-1, and a decreased catalase activity was found in both male and female SAMP-8 mice, which correlates with the lower catalase expression found by Western blotting. Nissl staining showed marked loss of neuronal cells in the cerebral cortex of five months-old SAMP-8 mice. SAMP-8 mice also had marked astrogliosis and microgliosis. We also found an increase in caspase-3 and calpain activity in the cortex. In addition, we observed morphological changes in the immunostaining of tau protein in SAMP-8, indicative of a loss of their structural function. Altogether, these results show that, at as early as 5 months of age, SAMP-8 mice have cytological and molecular alterations indicative of neurodegeneration in the cerebral cortex and suggestive of altered control of the production of oxidative species and hyper-activation of calcium-dependent enzymes. (c) 2006 Elsevier Inc. All rights reserved.

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Título según WOS: ID WOS:000237889900003 Not found in local WOS DB
Título de la Revista: EXPERIMENTAL GERONTOLOGY
Volumen: 41
Número: 4
Editorial: Pergamon Press
Fecha de publicación: 2006
Página de inicio: 360
Página final: 367
DOI:

10.1016/j.exger.2006.01.015

Notas: ISI