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Decrease in Cu/Zn- and Mn-superoxide dismutase activities in brain and spinal cord of patients with amyotrophic
1First Department of Internal Medicine, Kumamoto University School of Medicine, Japan.
Journal of the Neurological Sciences
|December 1, 1994
Summary
In sporadic amyotrophic lateral sclerosis (ALS), levels of copper/zinc-superoxide dismutase (Cu/Zn-SOD) and manganese-superoxide dismutase (Mn-SOD) are reduced in central nervous system neurons. This leads to superoxide accumulation and neuronal damage.
Area of Science:
- Neuroscience
- Biochemistry
- Genetics
Background:
- Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease affecting motor neurons.
- Mutations in the copper/zinc-superoxide dismutase (SOD) gene are linked to familial ALS (FALS).
- The role of SOD in sporadic ALS is not fully understood.
Purpose of the Study:
- To investigate differences in SOD distribution and activity in the central nervous system (CNS) of sporadic ALS patients compared to controls.
- To explore the potential link between SOD dysfunction and neuronal degeneration in ALS.
Main Methods:
- Autopsy samples of frontal cortex, cerebellum, and spinal cord from 5 ALS patients and 10 controls were analyzed.
- Immunohistochemistry was used to assess the distribution of Cu/Zn-SOD and Mn-SOD.
- Enzyme assays determined total SOD activity in CNS tissue.
Main Results:
- ALS patients showed reduced staining for both Cu/Zn-SOD and Mn-SOD in CNS neurons compared to controls.
- Pia mater and choroid plexus epithelial cells exhibited intense SOD staining in both groups.
- Total SOD enzyme activity did not differ significantly between ALS patients and controls.
Conclusions:
- Sporadic ALS is associated with decreased activity of Cu/Zn-SOD and Mn-SOD within CNS neurons.
- Reduced SOD activity may lead to superoxide accumulation, causing neuronal damage and degeneration.
- These findings highlight a potential mechanism for neuronal death in sporadic ALS.