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Immunohistochemical study of alpha 2 macroglobulin receptor in Alzheimer and control postmortem human brain

I Tooyama1, T Kawamata, H Akiyama

  • 1Department of Psychiatry, University of British Columbia, Vancouver, Canada.

Molecular and Chemical Neuropathology
|January 1, 1993
PubMed

Insights

The alpha 2 macroglobulin receptor (alpha 2MR) is found in human brain cells and blood vessels. Its presence is elevated in Alzheimer disease (AD) brains, particularly in neurons, glia, and pathological hallmarks like plaques and tangles.

Area of Science:

  • Neuroscience
  • Pathology
  • Immunohistochemistry

Background:

  • The alpha 2 macroglobulin receptor (alpha 2MR) plays a role in cellular uptake and signaling.
  • Dysregulation of receptors is implicated in neurodegenerative diseases.

Purpose of the Study:

  • To investigate the localization and expression of alpha 2 macroglobulin receptor (alpha 2MR) in Alzheimer disease (AD) brain tissue.
  • To compare alpha 2MR distribution in AD cases versus age-matched controls.

Main Methods:

  • Immunohistochemical analysis using a monoclonal antibody (A2MR alpha 2) against alpha 2MR.
  • Examination of postmortem human brain tissue from AD patients and healthy controls.

Main Results:

  • Alpha 2MR was detected in neurons, glia, and capillaries in control brains, with notable presence in the hippocampus and entorhinal cortex.
  • In Alzheimer disease brains, alpha 2MR immunoreactivity was significantly enhanced in neurons and glial cells.
  • Pathological features of AD, including senile plaques, neurofibrillary tangles, and dystrophic neurites, showed strong alpha 2MR staining.

Conclusions:

  • Alpha 2 macroglobulin receptor (alpha 2MR) expression is altered in Alzheimer disease.
  • The findings suggest a potential role for alpha 2MR in the pathogenesis of Alzheimer disease.

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