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Increased cathepsin B activity in multiple sclerosis brain

C T Bever1, D W Garver

  • 1Department of Neurology, University of Maryland Hospital, Baltimore 21201, USA.

Journal of the Neurological Sciences
|July 1, 1995
PubMed
Summary
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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.

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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.