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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Oxidative stress as a potential pathogenic mechanism in an animal model of Duchenne muscular dystrophy.
Neuromuscular Disorders : NMD 1997 September
Dystrophin-deficiency results in degeneration of most, but not all, skeletal muscles. The mechanisms responsible for degeneration of limb muscle and sparing of extraocular muscle are not known. To address the notion that muscle pathology may be free radical-mediated, we evaluated antioxidant enzyme activities and lipid peroxidation products (TBARS) content in mdx and control mice. TBARS content and the activities of total superoxide dismutase, selenium dependent glutathione peroxidase, glucose-6-phosphate dehydrogenase and catalase were consistently higher in both affected and spared muscles of mdx mice. These data suggest that oxidative stress may be constitutively present in mdx muscle, but may not be the principal pathogenic mechanism. To further test the hypothesis of oxidative stress involvement in dystrophinopathies, control strain and mdx mice were subjected to chronic hyperoxia. The pattern of antioxidant enzyme activities and TBARS content from hyperoxic control strain mice was similar to that of normoxic mdx mice, suggesting that a similar level of oxidative stress was induced. In conclusion, this study has provided indirect evidence for oxidative stress in dystrophin-deficient muscle.
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