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Multicatalytic proteinase is present in Lewy bodies and neurofibrillary tangles in diffuse Lewy body disease brains

S Kwak1, T Masaki, S Ishiura

  • 1National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan.

Neuroscience Letters
|July 8, 1991
PubMed

Insights

A non-lysosomal multicatalytic proteinase (MCP) was found in Lewy bodies within brains affected by cortical diffuse Lewy body disease. This suggests MCP may play a role in the formation of these protein inclusions.

Area of Science:

  • Neuropathology
  • Neuroscience
  • Biochemistry

Background:

  • Lewy bodies and neurofibrillary tangles are key pathological hallmarks in neurodegenerative diseases.
  • The precise molecular composition and formation mechanisms of these inclusions remain incompletely understood.

Purpose of the Study:

  • To investigate the presence and distribution of non-lysosomal multicatalytic proteinase (MCP) in brain inclusions associated with cortical diffuse Lewy body disease.
  • To explore the potential role of MCP in the pathogenesis of Lewy bodies.

Main Methods:

  • Immunohistochemistry was employed to visualize MCP in brain tissue samples.
  • Analysis focused on the co-localization of MCP with Lewy bodies and neurofibrillary tangles.

Main Results:

  • MCP was detected in virtually all Lewy bodies, showing diverse staining patterns (diffuse, central core, peripheral rim).
  • MCP was also found in loosely arranged globose tangles.
  • However, MCP was largely absent from compact neurofibrillary tangles.

Conclusions:

  • Non-lysosomal multicatalytic proteinase (MCP) is a component of Lewy bodies in cortical diffuse Lewy body disease.
  • The findings suggest a potential involvement of MCP in the formation or stabilization of Lewy body inclusions.

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