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Increased cathepsin B activity in multiple sclerosis brain
1Department of Neurology, University of Maryland Hospital, Baltimore 21201, USA.
Abstract:
Cathepsin B (CB) activity was measured in aqueous extracts of frozen autopsy specimens of centrum semiovale from three MS patients, five control patients with other neurological diseases, and five normal individuals. Mean activity was significantly increased in the MS tissue compared with controls. The mean activity in MS tissue containing demyelinating lesions was higher than that in normal appearing white matter which was higher than that in normal control specimens but the differences were not statistically significant. The mean CB activity in patients with other neurological diseases was higher than normal control activity and, although the difference was not statistically significant, this observation suggests that increases in CB may not be specific for MS. Immunohistochemical studies of the MS brain tissue analyzed biochemically suggested that monocytes, macrophages and reactive astrocytes are potential sources of increased CB in MS brain.
Insights
Cathepsin B (CB) activity is elevated in multiple sclerosis (MS) brain tissue. This suggests CB may play a role in MS pathology, though increases were also observed in other neurological diseases.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Multiple Sclerosis (MS) is a chronic inflammatory disease of the central nervous system.
- The role of specific enzymes like Cathepsin B (CB) in MS pathogenesis is not fully understood.
Purpose of the Study:
- To investigate Cathepsin B (CB) activity levels in the brain tissue of multiple sclerosis (MS) patients.
- To compare CB activity in MS tissue with control groups, including other neurological diseases and normal individuals.
Main Methods:
- Aqueous extracts from frozen autopsy specimens of centrum semiovale were analyzed.
- Cathepsin B (CB) activity was measured biochemically.
- Immunohistochemistry was used to identify potential cellular sources of CB in MS brain tissue.
Main Results:
- Mean Cathepsin B (CB) activity was significantly increased in MS brain tissue compared to controls.
- CB activity was higher in MS lesions and normal-appearing white matter than in normal controls, but differences were not statistically significant.
- Elevated CB activity was also observed in patients with other neurological diseases, suggesting a lack of specificity for MS.
Conclusions:
- Cathepsin B (CB) activity is elevated in the brain tissue of multiple sclerosis (MS) patients.
- Monocytes, macrophages, and reactive astrocytes are identified as potential sources of increased CB in MS.
- The observed increase in CB activity may not be exclusive to MS, indicating a broader role in neurological conditions.