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Related Experiment Videos

Neuroendocrinological function in Alzheimer's disease.

M Franceschi1, L Perego, L Ferini-Strambi

  • 1Department of Neurology, Scientific Institute S. Raffaele, Milan, Italy.

Neuroendocrinology
|October 1, 1988
PubMed
Summary

Alzheimer's disease (AD) patients showed higher basal beta-endorphin levels compared to controls. Neuroendocrine function, particularly pituitary hormone regulation, appears altered in AD, though most measured hormones remained similar between groups.

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Area of Science:

  • Neuroendocrinology
  • Neuroscience
  • Gerontology

Background:

  • Neurotransmitter deficits (dopamine, acetylcholine, etc.) are observed in Alzheimer's disease (AD) brains.
  • The hypothalamus, crucial for neuroendocrine regulation, exhibits pathological changes in AD.
  • Despite these indicators, neuroendocrine function in AD patients remains under-investigated.

Purpose of the Study:

  • To compare neuroendocrine function in patients with probable AD versus non-demented controls.
  • To investigate basal and stimulated plasma levels of key pituitary hormones and endorphins.

Main Methods:

  • Radioimmunoassays (RIA) were used to measure plasma levels of prolactin (PRL), growth hormone (GH), and thyroid-stimulating hormone (TSH).
  • Hormone levels were assessed before and after stimulation with metoclopramide, l-dopa, or thyrotropin-releasing hormone.

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  • Basal plasma levels of beta-endorphin and beta-lipotropin were measured using RIA post-high-performance liquid chromatography.

    • Main Results:

    • Basal and stimulated plasma levels of PRL, GH, TSH, and beta-lipotropin were comparable between AD patients and controls.
    • Significantly higher basal plasma levels of beta-endorphin were observed in the AD patient group.
    • This elevation in beta-endorphin may suggest decreased tuberoinfundibular dopaminergic activity, a finding also noted in Parkinson's disease.

    Conclusions:

    • Neuroendocrine dysfunction, specifically elevated beta-endorphin, may be present in Alzheimer's disease.
    • While most pituitary hormone responses were similar, the beta-endorphin finding warrants further investigation for clinical significance.
    • The results suggest potential links between dopaminergic activity and neuroendocrine alterations in AD.