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Related Experiment Video

Updated: May 31, 2025

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Depressive Symptoms and Amyloid Pathology.

Wietse A Wiels1,2, Julie E Oomens3, Sebastiaan Engelborghs4,5,6

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Depressive symptoms in older adults were not linked to amyloid pathology in normal cognition but were linked to lower amyloid pathology in mild cognitive impairment. These findings suggest other mechanisms may underlie late-life depression.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Psychiatry

Background:

  • Depressive symptoms are linked to cognitive decline in older adults, but underlying mechanisms remain unclear.
  • Understanding the relationship between depression and amyloid pathology is crucial for diagnosis and treatment.

Purpose of the Study:

  • To investigate the association between depressive symptoms and amyloid pathology in older individuals without dementia.
  • To examine if this association is influenced by age, sex, education, or APOE genotype.

Main Methods:

  • Cross-sectional analysis of pooled data from 49 studies (Amyloid Biomarker Study).
  • Included 9746 individuals with normal cognition (NC) and 3023 with mild cognitive impairment (MCI).
  • Assessed amyloid pathology via cerebrospinal fluid (CSF) Aβ1-42 or PET scans; depressive symptoms via validated scales, diagnosis, or self-report.

Main Results:

  • In NC individuals, depressive symptoms were not associated with amyloid pathology (OR, 1.13; P=.29).
  • In MCI individuals, depressive symptoms were associated with a lower likelihood of amyloid pathology (OR, 0.73; P=.001).
  • In NC individuals, depressive symptoms were linked to higher amyloid pathology in APOE ε4 non-carriers only (mean difference, 5.0%; P=.02).

Conclusions:

  • Depressive symptoms are not consistently associated with increased amyloid pathology in normal cognition and are linked to decreased amyloid pathology in MCI.
  • Age, sex, and education did not influence these associations.
  • Non-amyloid mechanisms may frequently underlie depressive symptoms in older adults.