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Hypothalamic dysfunction in dementia

C G Gottfries1, J Balldin, K Blennow

  • 1Department of Psychiatry and Neurochemistry, University of Gothenburg, Mölndal Hospital, Mölndal, Sweden.

Journal of Neural Transmission. Supplementum
|January 1, 1994
PubMed
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Alzheimer's disease and dementia patients show elevated cortisol levels. A dexamethasone test revealed abnormal stress responses in many, suggesting HPA axis dysregulation may contribute to dementia symptoms and behaviors.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Gerontology

Background:

  • Alzheimer's disease (AD), senile dementia of Alzheimer type (SDAT), and vascular dementia (VAD) are major causes of cognitive decline.
  • The hypothalamic-pituitary-adrenal (HPA) axis is implicated in stress response and has been linked to dementia pathophysiology.
  • Understanding HPA axis function in different dementia types is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate basal and post-dexamethasone suppression test (DST) cortisol levels in patients with AD, SDAT, and VAD.
  • To correlate HPA axis activity with dementia severity, cognitive impairment, and behavioral disturbances.
  • To explore the potential role of HPA axis dysregulation in the manifestation of dementia symptoms.

Main Methods:

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  • Patients diagnosed with AD, SDAT, or VAD were assessed for dementia severity using DSM-III-R and GBS scales.
  • Basal cortisol levels were measured.
  • A dexamethasone suppression test (DST) was performed, with post-DST cortisol levels analyzed.

    • Main Results:

    • Elevated basal cortisol levels were observed across all dementia groups (AD, SDAT, VAD).
    • A significant proportion of patients in each group failed to suppress cortisol post-DST: 40% in AD, 54% in SDAT, and 49% in VAD.
    • Correlations between post-DST cortisol and clinical variables were most prominent in the VAD group, where abnormal DST results were associated with greater intellectual impairment and anxiety.

    Conclusions:

    • HPA axis hyperactivity, indicated by abnormal DST results, is prevalent in dementia patients, including AD, SDAT, and VAD.
    • This dysregulation may stem from disrupted cortical-hypothalamic connections, particularly in dementia with white matter changes.
    • Behavioral disturbances in dementia could be partly attributed to HPA axis overactivity, rather than solely the neurodegenerative process.