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Increased generation of superoxide radicals in the blood of MS patients
A Glabiński1, N S Tawsek, G Bartosz
1Department of Neurology, Medical School, Lódź, Poland.
Abstract:
Increased generation of superoxide radical (O2-) in the blood stimulated with phorbol myristate acetate (PMA) has been found in multiple sclerosis (MS) patients. All the subjects studied were non-smokers and received the same hospital diet. In the MS group treated with prednisone superoxide radical generation was lower than in untreated patients, but was still above the level of O2- generation in controls. Plasma lipid peroxidation products, measured as thiobarbituric-reactive substances, were slightly elevated in both prednisone treated and non-treated MS patients in comparison with controls. Erythrocyte superoxide dismutase activity (SOD) was at the same level in MS and control groups. These results suggest that increased generation of reactive oxygen species may occur in MS patients during acute relapse. This phenomenon may be involved in the pathomechanism of demyelinating disorders.
Insights
Multiple sclerosis patients show increased superoxide radical generation, a reactive oxygen species. While prednisone treatment reduced this, levels remained elevated, suggesting a role in demyelinating disorders.
Area of Science:
- Neurology
- Biochemistry
- Immunology
Background:
- Multiple sclerosis (MS) is a chronic demyelinating disorder of the central nervous system.
- Oxidative stress, indicated by increased reactive oxygen species (ROS), is implicated in neuroinflammation and neurodegeneration.
- Superoxide radical (O2-) is a key ROS implicated in cellular damage.
Purpose of the Study:
- To investigate superoxide radical generation in patients with multiple sclerosis.
- To assess the effect of prednisone treatment on superoxide radical generation in MS patients.
- To explore the potential role of ROS in the pathogenesis of MS.
Main Methods:
- Blood samples were stimulated with phorbol myristate acetate (PMA) to induce superoxide radical (O2-) generation.
- Superoxide dismutase (SOD) activity and plasma thiobarbituric-reactive substances (TBARS) were measured.
- Comparison between non-smoking MS patients (treated and untreated with prednisone) and healthy controls.
Main Results:
- MS patients exhibited higher O2- generation compared to controls.
- Prednisone treatment reduced O2- generation in MS patients, but levels remained elevated compared to controls.
- Plasma lipid peroxidation products (TBARS) were slightly elevated in both treated and untreated MS patients.
- Erythrocyte SOD activity was comparable between MS patients and controls.
Conclusions:
- Increased generation of reactive oxygen species, specifically superoxide radicals, occurs in multiple sclerosis patients during acute relapse.
- These findings suggest that oxidative stress may contribute to the pathomechanism of demyelinating disorders like MS.
- Further research is warranted to explore therapeutic strategies targeting oxidative stress in MS management.