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A comparative immunohistochemical study on striatal Met-enkephalin expression in Alzheimer's disease and in
S Matsumoto1, S Goto, A Hirano
1Bluestone Laboratory, Division of Neuropathology, Montefiore Medical Center, Bronx, NY 10467.
Abstract:
Using a sensitive immunoperoxidase technique we examined Met-enkephalin (MEnk) expression in the striatum and globus pallidus external segment (GPe) from patients with Alzheimer's disease (AD) and with progressive supranuclear palsy (PSP). In AD patients strong MEnk-like immunoreactivity was persistent in the striatum showing so-called "striosomes". In addition, a number of typical "woolly fibers" were observed in the GPe. MEnk-positive striosomes were also visible in the striatum of PSP patients and were similar to those of normal controls and of AD patients. However, the MEnk-positive "woolly fibers" appearance was less well recognizable in the GPe from all the PSP patients examined.
Insights
Alzheimer's disease (AD) and progressive supranuclear palsy (PSP) show distinct Met-enkephalin (MEnk) patterns in the brain. While AD patients exhibit persistent MEnk striosomes and GPe "woolly fibers," PSP patients show less recognizable MEnk "woolly fibers" in the GPe.
Area of Science:
- Neuroscience
- Neuropathology
Background:
- Alzheimer's disease (AD) and progressive supranuclear palsy (PSP) are neurodegenerative disorders affecting brain function.
- Met-enkephalin (MEnk) is an endogenous opioid peptide with a role in neurological pathways.
Purpose of the Study:
- To investigate and compare Met-enkephalin (MEnk) expression in the striatum and globus pallidus external segment (GPe) of patients with Alzheimer's disease (AD) and progressive supranuclear palsy (PSP).
Main Methods:
- Utilized a sensitive immunoperoxidase technique.
- Examined MEnk expression in post-mortem brain tissue from AD and PSP patients.
Main Results:
- In Alzheimer's disease (AD) patients, strong MEnk-like immunoreactivity was observed in striatal 'striosomes'.
- Typical 'woolly fibers' showing MEnk immunoreactivity were noted in the globus pallidus external segment (GPe) of AD patients.
- MEnk-positive striosomes were present in the striatum of progressive supranuclear palsy (PSP) patients, similar to controls and AD patients.
- MEnk-positive 'woolly fibers' in the GPe were less recognizable in PSP patients compared to AD patients.
Conclusions:
- Met-enkephalin (MEnk) expression patterns in the striatum and globus pallidus external segment (GPe) differ between Alzheimer's disease (AD) and progressive supranuclear palsy (PSP).
- The distinct MEnk 'woolly fibers' in the GPe are a notable feature in AD but are less apparent in PSP, suggesting potential differences in the pathophysiology of these neurodegenerative diseases.