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Basic Science and Pathogenesis.

Emrah Düzel1,2, Ugur Cikrikcili3,4, Björn H Schott5

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Summary
This summary is machine-generated.

Subclinical depressive symptoms do not significantly alter amygdala novelty responses in preclinical Alzheimer's disease (AD). While affective changes are common in early cognitive decline, their specific impact on amygdala function in AD requires further investigation.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Psychiatry

Background:

  • Late-life depression (LLD) is a known risk factor for Alzheimer's disease (AD) and cognitive decline.
  • The amygdala, crucial for emotion and novelty detection, is an early site of tau accumulation in AD.
  • The interaction between depressive symptoms, tau burden, and amygdala function in preclinical AD remains unclear.

Purpose of the Study:

  • To investigate the relationship between amygdala novelty responses and depressive symptoms in preclinical AD.
  • To examine how tau pathology influences this relationship.

Main Methods:

  • 190 participants (Healthy Controls, Subjective Cognitive Decline, Mild Cognitive Impairment) underwent fMRI to assess amygdala novelty responses.
  • Depression severity was measured using the Geriatric Depression Scale (GDS).
  • Tau pathology was assessed via cerebrospinal fluid (CSF) p-Tau and t-Tau levels.

Main Results:

  • Individuals with subjective cognitive decline (SCD) and mild cognitive impairment (MCI) showed higher GDS scores than healthy controls (HC).
  • No significant correlation was found between amygdala novelty responses and GDS scores.
  • CSF tau levels did not significantly interact with depressive symptoms in predicting amygdala responses.

Conclusions:

  • Subclinical depressive symptoms do not appear to significantly impact amygdala novelty responses in preclinical AD.
  • Affective changes are present in early cognitive decline, but their link to amygdala function needs more research.
  • Future studies should examine clinically significant depression, longitudinal affective changes, and other AD biomarkers like amyloid and neuroinflammation.